Add cover page support with Chinese font rendering

Features:
- Cover page generation using Python/Pillow with Apple PingFang font
- CLI commands: cover-create, job-cover for cover page management
- API endpoints: PUT /api/fax/jobs/{id}/cover for cover modification
- Send fax with cover page: --to, --from, --subject, --note options
- Multi-page TIFF parsing for PDF conversion (fix: all pages now sent)
- Preview HTML generation with pan/zoom support
- OCR verification for cover page content
- Class 2 receive support for incoming faxes

Fixes:
- Modem initialization before Class 2 mode entry
- Dial timeout handling with retry logic
- Multi-page fax transmission between pages
- Chinese character rendering in cover pages (Apple native fonts)

Cargo.lock

@@ -262,6 +262,12 @@ dependencies = [
  "tracing",
 ]
 
+[[package]]
+name = "base64"
+version = "0.22.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72b3254f16251a8381aa12e40e3c4d2f0199f8c6508fbecb9d91f575e0fbb8c6"
+
 [[package]]
 name = "bit_field"
 version = "0.10.3"
@@ -1981,6 +1987,7 @@ version = "0.1.0"
 dependencies = [
  "anyhow",
  "axum",
+ "base64",
  "chrono",
  "clap",
  "fax",

Cargo.toml

@@ -37,6 +37,7 @@ anyhow = "1"
 # Serialization
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
+base64 = "0.22"
 
 # Logging
 tracing = "0.1"

src/api/routes.rs

@@ -2,7 +2,7 @@ use axum::{
     extract::State,
     http::StatusCode,
     response::Json,
-    routing::{get, post},
+    routing::{get, post, put},
     Router,
 };
 use serde::{Deserialize, Serialize};
@@ -30,6 +30,10 @@ pub struct HealthResponse {
 pub struct SendFaxRequest {
     pub recipient: String,
     pub document_path: String,
+    pub cover_to: Option<String>,
+    pub cover_from: Option<String>,
+    pub cover_subject: Option<String>,
+    pub cover_notes: Option<String>,
 }
 
 #[derive(Serialize)]
@@ -37,6 +41,23 @@ pub struct SendFaxResponse {
     pub job_id: JobId,
 }
 
+#[derive(Deserialize)]
+pub struct UpdateCoverRequest {
+    pub to: Option<String>,
+    pub from: Option<String>,
+    pub subject: Option<String>,
+    pub notes: Option<String>,
+}
+
+#[derive(Serialize)]
+pub struct UpdateCoverResponse {
+    pub job_id: JobId,
+    pub cover_to: Option<String>,
+    pub cover_from: Option<String>,
+    pub cover_subject: Option<String>,
+    pub cover_notes: Option<String>,
+}
+
 #[derive(Serialize)]
 pub struct JobResponse {
     pub id: JobId,
@@ -44,6 +65,10 @@ pub struct JobResponse {
     pub status: String,
     pub pages: u32,
     pub created_at: String,
+    pub cover_to: Option<String>,
+    pub cover_from: Option<String>,
+    pub cover_subject: Option<String>,
+    pub cover_notes: Option<String>,
 }
 
 async fn health(State(state): State<AppState>) -> Json<HealthResponse> {
@@ -57,7 +82,11 @@ async fn send_fax(
     State(state): State<AppState>,
     Json(req): Json<SendFaxRequest>,
 ) -> Result<Json<SendFaxResponse>, StatusCode> {
-    let job = FaxJob::new(req.recipient, req.document_path);
+    let mut job = FaxJob::new(req.recipient, req.document_path);
+    job.cover_to = req.cover_to;
+    job.cover_from = req.cover_from;
+    job.cover_subject = req.cover_subject;
+    job.cover_notes = req.cover_notes;
     let job_id = job.id;
 
     let mut queue = state.queue.lock().unwrap();
@@ -78,6 +107,10 @@ async fn list_jobs(State(state): State<AppState>) -> Json<Vec<JobResponse>> {
             status: format!("{:?}", j.status),
             pages: j.pages,
             created_at: j.created_at.to_rfc3339(),
+            cover_to: j.cover_to,
+            cover_from: j.cover_from,
+            cover_subject: j.cover_subject,
+            cover_notes: j.cover_notes,
         })
         .collect();
     Json(responses)
@@ -94,9 +127,34 @@ async fn get_job(
         status: format!("{:?}", j.status),
         pages: j.pages,
         created_at: j.created_at.to_rfc3339(),
+        cover_to: j.cover_to,
+        cover_from: j.cover_from,
+        cover_subject: j.cover_subject,
+        cover_notes: j.cover_notes,
     })).ok_or(StatusCode::NOT_FOUND)
 }
 
+async fn update_job_cover(
+    State(state): State<AppState>,
+    axum::extract::Path(id): axum::extract::Path<JobId>,
+    Json(req): Json<UpdateCoverRequest>,
+) -> Result<Json<UpdateCoverResponse>, StatusCode> {
+    let mut queue = state.queue.lock().unwrap();
+    queue
+        .update_cover(&id, req.to.clone(), req.from.clone(), req.subject.clone(), req.notes.clone())
+        .map_err(|_| StatusCode::INTERNAL_SERVER_ERROR)?;
+
+    // Return updated fields
+    let job = queue.get(&id).ok_or(StatusCode::NOT_FOUND)?;
+    Ok(Json(UpdateCoverResponse {
+        job_id: job.id,
+        cover_to: job.cover_to,
+        cover_from: job.cover_from,
+        cover_subject: job.cover_subject,
+        cover_notes: job.cover_notes,
+    }))
+}
+
 pub async fn start_server(config: FaxConfig, queue: Arc<Mutex<FaxQueue>>) -> FaxResult<()> {
     let state = AppState {
         config: config.clone(),
@@ -108,6 +166,7 @@ pub async fn start_server(config: FaxConfig, queue: Arc<Mutex<FaxQueue>>) -> Fax
         .route("/api/fax/send", post(send_fax))
         .route("/api/fax/jobs", get(list_jobs))
         .route("/api/fax/jobs/{id}", get(get_job))
+        .route("/api/fax/jobs/{id}/cover", put(update_job_cover))
         .with_state(state);
 
     let addr = config

src/document/cover.rs

@@ -0,0 +1,141 @@
+use crate::error::{FaxError, Result};
+use crate::document::convert::Page;
+use std::process::Command;
+
+const COVER_PY: &str = r#"from PIL import Image, ImageDraw, ImageFont
+import sys, json, os
+
+params = json.loads(sys.argv[1])
+to = params['to']
+sender = params['from']
+subject = params['subject']
+notes = params['notes']
+total_pages = params['total_pages']
+output_path = params['output']
+
+W, H = 1728, 2291
+img = Image.new('L', (W, H), 255)
+draw = ImageDraw.Draw(img)
+
+PINGFANG_PATH = '/System/Library/AssetsV2/com_apple_MobileAsset_Font8/86ba2c91f017a3749571a82f2c6d890ac7ffb2fb.asset/AssetData/PingFang.ttc'
+STHEITI_PATH = '/System/Library/Fonts/STHeiti Medium.ttc'
+
+font_path = PINGFANG_PATH if os.path.exists(PINGFANG_PATH) else STHEITI_PATH if os.path.exists(STHEITI_PATH) else None
+
+font_title = None
+font_bold = None
+font_normal = None
+font_small = None
+
+if font_path:
+    try:
+        if 'PingFang' in font_path:
+            font_title = ImageFont.truetype(font_path, 72, index=10)
+            font_bold = ImageFont.truetype(font_path, 44, index=6)
+            font_normal = ImageFont.truetype(font_path, 44, index=2)
+            font_small = ImageFont.truetype(font_path, 36, index=2)
+        else:
+            font_title = ImageFont.truetype(font_path, 72, index=0)
+            font_bold = ImageFont.truetype(font_path, 44, index=0)
+            font_normal = ImageFont.truetype(font_path, 44, index=0)
+            font_small = ImageFont.truetype(font_path, 36, index=0)
+    except Exception as e:
+        font_path = None
+
+if not font_path:
+    try:
+        font_title = ImageFont.truetype('/System/Library/Fonts/Supplemental/Arial Unicode.ttf', 72)
+        font_bold = ImageFont.truetype('/System/Library/Fonts/Supplemental/Arial Unicode.ttf', 44)
+        font_normal = ImageFont.truetype('/System/Library/Fonts/Supplemental/Arial Unicode.ttf', 44)
+        font_small = ImageFont.truetype('/System/Library/Fonts/Supplemental/Arial Unicode.ttf', 36)
+    except Exception:
+        font_title = ImageFont.load_default()
+        font_bold = font_title
+        font_normal = font_title
+        font_small = font_title
+
+draw.rectangle([(0, 2030), (1728, 2230)], fill=0)
+_, _, tw, _ = draw.textbbox((0, 0), 'FACSIMILE', font=font_title)
+draw.text(((W - tw) / 2, 2080), 'FACSIMILE', fill=255, font=font_title)
+
+draw.line([(100, 1980), (1628, 1980)], fill=0, width=3)
+
+from datetime import datetime
+date_str = datetime.now().strftime('%Y/%m/%d %H:%M')
+
+labels = ['TO:', 'FROM:', 'DATE:', 'PAGES:', 'SUBJECT:']
+values = [to, sender, date_str, str(total_pages), subject]
+y = 1880
+
+for label, value in zip(labels, values):
+    draw.text((100, y), label, fill=0, font=font_bold)
+    draw.text((300, y), value, fill=0, font=font_normal)
+    y -= 90
+
+draw.line([(100, y), (1628, y)], fill=0, width=3)
+y -= 70
+
+draw.text((100, y), 'NOTES:', fill=0, font=font_bold)
+y -= 50
+for line in notes.split('\n'):
+    draw.text((100, y), line, fill=0, font=font_small)
+    y -= 40
+
+img.save(output_path, dpi=(204, 196))
+print(json.dumps({"ok": True}))
+"#;
+
+pub struct CoverParams {
+    pub to: String,
+    pub from: String,
+    pub subject: String,
+    pub notes: String,
+    pub total_pages: u32,
+}
+
+pub fn generate_cover_page(params: &CoverParams) -> Result<Page> {
+    let stamp = std::time::SystemTime::now()
+        .duration_since(std::time::UNIX_EPOCH)
+        .unwrap()
+        .as_nanos();
+
+    let py_dir = std::env::temp_dir();
+    let py_path = py_dir.join(format!("telfax_cover_{}.py", stamp));
+    let tiff_path = py_dir.join(format!("telfax_cover_{}.tif", stamp));
+
+    std::fs::write(&py_path, COVER_PY)?;
+
+    let py_params = serde_json::json!({
+        "to": params.to,
+        "from": params.from,
+        "subject": params.subject,
+        "notes": params.notes,
+        "total_pages": params.total_pages,
+        "output": tiff_path.to_string_lossy(),
+    });
+
+    let python = if cfg!(target_os = "windows") { "python" } else { "python3" };
+
+    let output = Command::new(python)
+        .arg(py_path.to_string_lossy().as_ref())
+        .arg(py_params.to_string())
+        .output()
+        .map_err(|e| FaxError::document(format!("Python cover script failed: {}", e)))?;
+
+    if !output.status.success() {
+        let stderr = String::from_utf8_lossy(&output.stderr);
+        std::fs::remove_file(&py_path).ok();
+        std::fs::remove_file(&tiff_path).ok();
+        return Err(FaxError::document(format!("Cover generation error: {}", stderr)));
+    }
+
+    let tiff_data = std::fs::read(&tiff_path)?;
+    let doc = super::pdf::tiff_to_fax_document(&tiff_data)?;
+
+    std::fs::remove_file(&py_path).ok();
+    std::fs::remove_file(&tiff_path).ok();
+
+    Ok(doc.pages.into_iter().next().ok_or_else(|| {
+        FaxError::document("Cover page generation produced no pages")
+    })?)
+}

src/document/mod.rs

@@ -1,7 +1,9 @@
 pub mod convert;
 pub mod tiff;
 pub mod pdf;
+pub mod cover;
 
 pub use convert::{document_from_image, document_from_tiff, DocumentFormat, FaxDocument, Page};
 pub use tiff::TiffFaxWriter;
 pub use pdf::pdf_to_fax_document;
+pub use cover::{generate_cover_page, CoverParams};

src/document/pdf.rs

@@ -55,44 +55,58 @@ pub fn tiff_to_fax_document(tiff_data: &[u8]) -> Result<FaxDocument> {
     let mut decoder = Decoder::new(&mut cursor)
         .map_err(|e| FaxError::document(format!("Failed to open TIFF: {}", e)))?;
 
-    let (width, height) = decoder.dimensions()
+    let mut pages = Vec::new();
-        .map_err(|e| FaxError::document(format!("Failed to get TIFF dimensions: {}", e)))?;
 
-    let bytes_per_row = ((width + 7) / 8) as usize;
+    loop {
-    let mut pixels = vec![0u8; bytes_per_row * height as usize];
+        let (width, height) = decoder.dimensions()
+            .map_err(|e| FaxError::document(format!("Failed to get TIFF dimensions: {}", e)))?;
 
-    let mut result = decoder.read_image()
+        let bytes_per_row = ((width + 7) / 8) as usize;
-        .map_err(|e| FaxError::document(format!("Failed to read TIFF image: {}", e)))?;
+        let mut pixels = vec![0u8; bytes_per_row * height as usize];
 
-    // Convert to 1-bit packed format
+        let mut result = decoder.read_image()
-    let buffer = result.as_buffer(0);
+            .map_err(|e| FaxError::document(format!("Failed to read TIFF image: {}", e)))?;
-    let img_data = buffer.as_bytes();
 
-    // Process each pixel - TIFF is grayscale (8-bit), convert to 1-bit
+        // Convert to 1-bit packed format
-    for (i, &byte) in img_data.iter().enumerate() {
+        let buffer = result.as_buffer(0);
-        let pixel_idx = i % width as usize;
+        let img_data = buffer.as_bytes();
-        let row_idx = i / width as usize;
-        let byte_idx = pixel_idx / 8;
-        let bit_idx = 7 - (pixel_idx % 8);
 
-        // WhiteIsZero: 0=white, 255=black
+        // Process each pixel - TIFF is grayscale (8-bit), convert to 1-bit
-        // We want: 1=black, 0=white (MSB first)
+        for (i, &byte) in img_data.iter().enumerate() {
-        if byte < 128 {
+            let pixel_idx = i % width as usize;
-            let idx = row_idx * bytes_per_row + byte_idx;
+            let row_idx = i / width as usize;
-            if idx < pixels.len() {
+            let byte_idx = pixel_idx / 8;
-                pixels[idx] |= 1 << bit_idx;
+            let bit_idx = 7 - (pixel_idx % 8);
+
+            // WhiteIsZero: 0=white, 255=black
+            // We want: 1=black, 0=white (MSB first)
+            if byte < 128 {
+                let idx = row_idx * bytes_per_row + byte_idx;
+                if idx < pixels.len() {
+                    pixels[idx] |= 1 << bit_idx;
+                }
             }
         }
+
+        pages.push(Page {
+            pixels,
+            width_pels: width,
+            rows: height,
+        });
+
+        // Try to advance to next page
+        match decoder.next_image() {
+            Ok(_) => continue,
+            Err(_) => break,
+        }
     }
 
-    let page = Page {
+    if pages.is_empty() {
-        pixels,
+        return Err(FaxError::document("TIFF contains no pages"));
-        width_pels: width,
+    }
-        rows: height,
-    };
 
     Ok(FaxDocument {
-        pages: vec![page],
+        pages,
         format: DocumentFormat::Tiff,
     })
 }

src/document/tiff.rs

@@ -2,6 +2,11 @@ use crate::document::convert::Page;
 use crate::error::{FaxError, Result};
 use tiff::encoder::colortype::Gray8;
 use tiff::encoder::TiffEncoder;
+use tiff::encoder::Rational;
+use tiff::tags::ResolutionUnit;
+
+const FAX_X_DPI: u32 = 204;
+const FAX_Y_DPI: u32 = 196;
 
 pub struct TiffFaxWriter;
 
@@ -25,8 +30,14 @@ impl TiffFaxWriter {
                 }
             }
 
-            encoder
+            let mut img = encoder
-                .write_image::<Gray8>(page.width_pels, page.rows, &gray_data)
+                .new_image::<Gray8>(page.width_pels, page.rows)
+                .map_err(|e| FaxError::document(format!("Failed to create TIFF image: {}", e)))?;
+
+            img.resolution_unit(ResolutionUnit::Inch);
+            img.x_resolution(Rational { n: FAX_X_DPI, d: 1 });
+            img.y_resolution(Rational { n: FAX_Y_DPI, d: 1 });
+            img.write_data(&gray_data)
                 .map_err(|e| FaxError::document(format!("Failed to write TIFF page: {}", e)))?;
         }
 

src/fax/class1/send.rs

@@ -39,6 +39,27 @@ impl<'a> Class1Send<'a> {
 
         self.session.transition(T30Event::Connected);
 
+        // After CONNECT, some modems need escape to enter online command mode
+        // Wait for silence (no CED tone yet), then escape
+        tracing::info!("Connection established, waiting for silence...");
+        std::thread::sleep(std::time::Duration::from_millis(1000));
+        
+        // Send escape sequence +++ (with guard times)
+        self.driver.write_raw(b"+++")?;
+        self.driver.flush()?;
+        std::thread::sleep(std::time::Duration::from_millis(1000));
+        
+        // Drain response
+        self.driver.drain()?;
+        
+        // Wait for CED tone and DIS from receiver (per T.30 spec)
+        tracing::info!("Waiting for receiver to send CED and DIS...");
+        std::thread::sleep(std::time::Duration::from_millis(4000));
+        
+        // Drain any pending data before entering HDLC receive mode
+        self.driver.drain()?;
+        tracing::info!("Entering HDLC receive mode...");
+
         let dis_frame = self.receive_hdlc_frame()?;
         tracing::info!("Received DIS frame ({} bytes)", dis_frame.len());
 
@@ -94,33 +115,72 @@ impl<'a> Class1Send<'a> {
         let cmd = format!("ATDT{}\r", number);
         self.driver.write_raw(cmd.as_bytes())?;
         self.driver.flush()?;
+        
+        tracing::info!("Dialing {}, waiting for response...", number);
 
-        let response = self.driver.read_until(b"\r\n", 60000)?;
+        let mut full_response = Vec::new();
-        let text = String::from_utf8_lossy(&response);
+        let start = std::time::Instant::now();
-        tracing::info!(response = %text, "Dial response");
+        let timeout_ms = 60000u64;
 
-        if text.contains("NO CARRIER") || text.contains("BUSY") {
+        loop {
-            return Err(FaxError::NoCarrier);
+            match self.driver.read_until(b"\r\n", 5000) {
+                Ok(line) => {
+                    let text = String::from_utf8_lossy(&line);
+                    tracing::info!("Dial line: {}", text.trim());
+                    full_response.extend_from_slice(&line);
+
+                    if text.contains("CONNECT") {
+                        tracing::info!("Connection established");
+                        return Ok(());
+                    }
+                    if text.contains("BUSY") {
+                        return Err(FaxError::modem("Line is BUSY"));
+                    }
+                    if text.contains("NO CARRIER") {
+                        return Err(FaxError::NoCarrier);
+                    }
+                    if text.contains("NO DIALTONE") {
+                        return Err(FaxError::modem("No dial tone"));
+                    }
+                }
+                Err(_) => {
+                    if start.elapsed().as_millis() as u64 > timeout_ms {
+                        break;
+                    }
+                }
+            }
         }
-        if !text.contains("CONNECT") {
+
-            return Err(FaxError::modem(format!("Unexpected dial response: {}", text)));
+        let text = String::from_utf8_lossy(&full_response);
-        }
+        Err(FaxError::modem(format!("Dial timeout, response: {}", text)))
-        Ok(())
     }
 
     fn receive_hdlc_frame(&mut self) -> Result<Vec<u8>> {
         self.driver.write_raw(b"AT+FRH=3\r")?;
+        self.driver.flush()?;
 
-        let response = self.driver.read_until(b"\r\n", 15000)?;
+        // Wait for CONNECT response - modem may take time to enter HDLC receive mode
+        let response = self.driver.read_until(b"CONNECT\r\n", 30000)?;
         let text = String::from_utf8_lossy(&response);
-        tracing::debug!(response = %text, "FRH initial");
+        tracing::info!(response = %text, "FRH response");
 
         if text.contains("NO CARRIER") || text.contains("ERROR") {
             return Err(FaxError::NoCarrier);
         }
 
-        let result = self.driver.read_until(b"OK\r\n", 10000)?;
+        // Now read the actual HDLC frame data until OK
-        Ok(result)
+        // The modem sends the HDLC frame bytes, then "OK\r\n"
+        let frame_and_ok = self.driver.read_until(b"OK\r\n", 60000)?;
+        
+        // Remove trailing "OK\r\n" if present
+        let frame_data = if frame_and_ok.ends_with(b"OK\r\n") {
+            &frame_and_ok[..frame_and_ok.len() - 4]
+        } else {
+            &frame_and_ok[..]
+        };
+
+        tracing::info!("Received {} bytes of HDLC data", frame_data.len());
+        Ok(frame_data.to_vec())
     }
 
     fn transmit_hdlc_frame(&mut self, frame: &[u8]) -> Result<()> {

src/fax/class2/mod.rs

@@ -1,5 +1,7 @@
 pub mod send;
+pub mod receive;
 pub mod commands;
 
 pub use send::Class2Send;
+pub use receive::Class2Receive;
 pub use commands::Class2Commands;

src/fax/class2/receive.rs

@@ -0,0 +1,230 @@
+use crate::error::{FaxError, Result};
+use crate::modem::driver::ModemDriver;
+
+const DLE: u8 = 0x10;
+const ETX: u8 = 0x03;
+
+pub struct Class2Receive<'a> {
+    driver: &'a mut ModemDriver,
+    station_id: String,
+}
+
+impl<'a> Class2Receive<'a> {
+    pub fn new(driver: &'a mut ModemDriver) -> Self {
+        Self {
+            driver,
+            station_id: "TELFAX".to_string(),
+        }
+    }
+
+    pub fn with_station_id(mut self, id: &str) -> Self {
+        self.station_id = id.to_string();
+        self
+    }
+
+    fn at(&mut self) -> crate::modem::at::AtChannel<'_> {
+        crate::modem::at::AtChannel::new(self.driver)
+    }
+
+    pub fn setup_auto_answer(&mut self, rings: u8) -> Result<()> {
+        tracing::info!("Setting up Class 2 auto-answer ({} rings)", rings);
+
+        self.at().send_command("AT", 2000)?;
+        self.at().send_command("AT+FCLASS=2", 3000)?;
+        
+        let station_cmd = format!("AT+FLID=\"{}\"", self.station_id);
+        self.at().send_command(&station_cmd, 3000)?;
+
+        let rings_cmd = format!("ATS0={}", rings);
+        self.at().send_command(&rings_cmd, 2000)?;
+
+        self.at().send_command("AT+FAA=1", 2000)?;
+
+        tracing::info!("Auto-answer configured");
+        Ok(())
+    }
+
+    pub fn wait_for_call(&mut self, timeout_ms: u64) -> Result<()> {
+        tracing::info!("Waiting for incoming call...");
+        
+        // In Class 2, the modem handles T.30 negotiation automatically
+        // We need to wait for +FCON which indicates fax session established
+        let response = self.driver.read_until(b"+FCON", timeout_ms)?;
+        let text = String::from_utf8_lossy(&response);
+        tracing::info!("Fax connection: {}", text.trim());
+
+        // Wait for +FDCS (Digital Command Signal) or +FPTS (Page Transfer Start)
+        // The modem will handle DIS/DCS negotiation automatically
+        tracing::info!("Waiting for page data...");
+        
+        Ok(())
+    }
+
+    pub fn receive_pages(&mut self) -> Result<Vec<Vec<u8>>> {
+        let mut pages = Vec::new();
+        let mut page_count = 0;
+        let mut receiving_page = false;
+        let mut page_data = Vec::new();
+
+        tracing::info!("Monitoring for page events...");
+
+        loop {
+            let event = self.wait_for_event(60000)?;
+
+            match event {
+                ReceiveEvent::Fpts => {
+                    tracing::info!("Page {} transfer starting...", page_count + 1);
+                    receiving_page = true;
+                    page_data = Vec::new();
+                }
+                ReceiveEvent::Ftsi(id) => {
+                    tracing::info!("Transmitting station: {}", id);
+                }
+                ReceiveEvent::PageData(data) => {
+                    if receiving_page {
+                        page_data.extend_from_slice(&data);
+                    }
+                }
+                ReceiveEvent::PageEnd(more) => {
+                    if receiving_page && !page_data.is_empty() {
+                        tracing::info!("Page {} received ({} bytes)", page_count + 1, page_data.len());
+                        pages.push(page_data.clone());
+                        page_count += 1;
+                    }
+                    receiving_page = false;
+                    if !more {
+                        tracing::info!("No more pages");
+                        break;
+                    }
+                }
+                ReceiveEvent::Fhng(code) => {
+                    tracing::info!("Session ended with code {}", code);
+                    break;
+                }
+                ReceiveEvent::NoCarrier => {
+                    tracing::info!("Carrier lost");
+                    break;
+                }
+                ReceiveEvent::Error(msg) => {
+                    tracing::error!("Error: {}", msg);
+                    if receiving_page && !page_data.is_empty() {
+                        pages.push(page_data.clone());
+                    }
+                    break;
+                }
+                _ => {}
+            }
+        }
+
+        Ok(pages)
+    }
+
+    fn wait_for_event(&mut self, timeout_ms: u64) -> Result<ReceiveEvent> {
+        let response = self.driver.read_until(b"\r\n", timeout_ms)?;
+        let text = String::from_utf8_lossy(&response);
+        let line = text.trim();
+
+        tracing::debug!("Event: {}", line);
+
+        if line.contains("+FPTS") {
+            Ok(ReceiveEvent::Fpts)
+        } else if line.contains("+FTSI") {
+            let id = extract_quoted_value(line);
+            Ok(ReceiveEvent::Ftsi(id))
+        } else if line.contains("+FDCS") {
+            Ok(ReceiveEvent::Fdcs)
+        } else if line.contains("+FCON") {
+            Ok(ReceiveEvent::Fcon)
+        } else if line.contains("+FET") || line.contains("+FCFR") {
+            let more = line.contains(",1") || line.contains("+FCFR");
+            Ok(ReceiveEvent::PageEnd(more))
+        } else if line.contains("+FHNG") {
+            let code = extract_number(line);
+            Ok(ReceiveEvent::Fhng(code))
+        } else if line.contains("NO CARRIER") {
+            Ok(ReceiveEvent::NoCarrier)
+        } else if line.contains("ERROR") {
+            Ok(ReceiveEvent::Error(line.to_string()))
+        } else if line.contains("OK") {
+            // Data transmission complete marker
+            Ok(ReceiveEvent::DataOk)
+        } else if !line.is_empty() && !line.starts_with("AT") {
+            // Might be data - try to read raw bytes
+            let data = self.read_page_stream()?;
+            Ok(ReceiveEvent::PageData(data))
+        } else {
+            Ok(ReceiveEvent::Unknown(line.to_string()))
+        }
+    }
+
+    fn read_page_stream(&mut self) -> Result<Vec<u8>> {
+        let mut data = Vec::new();
+        let mut dle_seen = false;
+
+        // Read until DLE-ETX
+        for _ in 0..100000 {
+            let byte = self.driver.read_byte(5000)?;
+
+            if dle_seen {
+                if byte == ETX {
+                    break;
+                } else if byte == DLE {
+                    data.push(DLE);
+                }
+                dle_seen = false;
+            } else if byte == DLE {
+                dle_seen = true;
+            } else {
+                data.push(byte);
+            }
+        }
+
+        Ok(data)
+    }
+
+    pub fn end_session(&mut self) -> Result<()> {
+        tracing::info!("Ending receive session");
+        self.driver.write_raw(b"AT+FKS\r")?;
+        self.driver.flush()?;
+
+        std::thread::sleep(std::time::Duration::from_millis(500));
+        self.driver.drain()?;
+
+        Ok(())
+    }
+}
+
+enum ReceiveEvent {
+    Fcon,
+    Fdcs,
+    Fpts,
+    Ftsi(String),
+    PageData(Vec<u8>),
+    PageEnd(bool),
+    Fhng(u8),
+    NoCarrier,
+    DataOk,
+    Error(String),
+    Unknown(String),
+}
+
+fn extract_quoted_value(s: &str) -> String {
+    if let Some(start) = s.find('"') {
+        if let Some(end) = s[start + 1..].find('"') {
+            return s[start + 1..start + 1 + end].to_string();
+        }
+    }
+    s.to_string()
+}
+
+fn extract_number(s: &str) -> u8 {
+    let parts: Vec<&str> = s.split(':').collect();
+    if parts.len() > 1 {
+        parts[1].trim().split(',')
+            .next()
+            .and_then(|n| n.trim().parse().ok())
+            .unwrap_or(0)
+    } else {
+        0
+    }
+}

src/fax/class2/send.rs

@@ -51,6 +51,10 @@ impl<'a> Class2Send<'a> {
     pub fn send_fax(&mut self, number: &str, pages: &[Page]) -> Result<()> {
         tracing::info!("Starting Class 2 fax to {}", number);
 
+        // Initialize modem first
+        self.at().send_command("AT", 3000)?;
+        tracing::debug!("Modem initialized");
+
         // Enter Class 2 mode
         self.at().send_command(Class2Commands::ENTER_CLASS2, 5000)?;
         tracing::info!("Entered Class 2 mode");
@@ -60,14 +64,18 @@ impl<'a> Class2Send<'a> {
         self.at().send_command(&station_cmd, 3000)?;
         tracing::info!("Station ID set: {}", self.station_id);
 
-        // Set header
+        // Set header - may not be supported on some modems
         let header_cmd = Class2Commands::set_header(&self.header);
-        self.at().send_command(&header_cmd, 3000)?;
+        if self.at().send_command(&header_cmd, 3000).is_err() {
+            tracing::warn!("Header command not supported, skipping");
+        }
 
-        // Set capabilities
+        // Set capabilities - skip if not supported
         let speed = if self.params.speed > 0 { self.params.speed } else { BR_V17_14400 };
         let dis_cmd = Class2Commands::set_dis_params(self.params.resolution, speed, self.params.ecm);
-        self.at().send_command(&dis_cmd, 3000)?;
+        if self.at().send_command(&dis_cmd, 3000).is_err() {
+            tracing::warn!("DIS params command not supported, using defaults");
+        }
 
         // Dial
         self.dial(number)?;
@@ -94,25 +102,64 @@ impl<'a> Class2Send<'a> {
         self.driver.write_raw(cmd.as_bytes())?;
         self.driver.write_raw(b"\r")?;
         self.driver.flush()?;
+        tracing::info!("Dialing: {}", cmd);
 
-        // Wait for CONNECT or response
+        let deadline = std::time::Instant::now() + std::time::Duration::from_secs(60);
-        let response = self.driver.read_until(b"\r\n", 60000)?;
-        let text = String::from_utf8_lossy(&response);
-        tracing::info!("Dial response: {}", text);
 
-        // Check for successful connection
+        // Read lines until CONNECT or error
-        if text.contains("NO CARRIER") || text.contains("BUSY") {
+        while std::time::Instant::now() < deadline {
-            return Err(FaxError::NoCarrier);
+            let line = match self.driver.read_until(b"\r\n", 5000) {
+                Ok(l) => l,
+                Err(crate::error::FaxError::Timeout { .. }) => continue,
+                Err(e) => return Err(e),
+            };
+            let text = String::from_utf8_lossy(&line).trim().to_string();
+
+            if text.is_empty() {
+                continue;
+            }
+
+            tracing::info!("Dial response: {}", text);
+
+            // Skip command echo
+            if text.starts_with("ATDT") || text.starts_with("ATD") {
+                continue;
+            }
+
+            // Error conditions
+            if text.contains("NO CARRIER") || text.contains("BUSY") {
+                return Err(FaxError::NoCarrier);
+            }
+            if text.contains("ERROR") {
+                return Err(FaxError::modem("Dial command failed"));
+            }
+            if text.contains("+FHNG:") {
+                return Err(FaxError::protocol(format!("Fax hangup: {}", text)));
+            }
+
+            // Connection established
+            if text.contains("CONNECT") {
+                tracing::info!("Connected!");
+                // Read remaining session info (e.g. +FCON)
+                let extra = self.driver.read_all(2000)?;
+                let extra_text = String::from_utf8_lossy(&extra);
+                if !extra_text.trim().is_empty() {
+                    tracing::info!("Session info: {}", extra_text);
+                    if extra_text.contains("+FHNG:") {
+                        return Err(FaxError::protocol(format!("Fax hangup: {}", extra_text.trim())));
+                    }
+                }
+                return Ok(());
+            }
+
+            // Some modems send +FCON without CONNECT
+            if text.contains("+FCON") {
+                tracing::info!("Fax conference established");
+                return Ok(());
+            }
         }
 
-        // Class 2: wait for fax session indicators
+        Err(FaxError::Timeout { ms: 60000 })
-        // CONNECT indicates fax session is ready
-        // The modem returns: CONNECT, +FCON: <params>
-        let extra = self.driver.read_all(5000)?;
-        let extra_text = String::from_utf8_lossy(&extra);
-        tracing::info!("Session info: {}", extra_text);
-
-        Ok(())
     }
 
     fn send_page(&mut self, page: &Page) -> Result<()> {
@@ -120,13 +167,29 @@ impl<'a> Class2Send<'a> {
         self.driver.write_raw(b"AT+FDT\r")?;
         self.driver.flush()?;
 
-        // Wait for CONNECT
+        // Wait for CONNECT with longer timeout and retry logic
-        let response = self.driver.read_until(b"CONNECT\r\n", 10000)?;
+        let deadline = std::time::Instant::now() + std::time::Duration::from_secs(30);
-        let text = String::from_utf8_lossy(&response);
+        let mut got_connect = false;
-        tracing::debug!("FDT response: {}", text);
+        while std::time::Instant::now() < deadline {
+            let response = match self.driver.read_until(b"\r\n", 5000) {
+                Ok(r) => r,
+                Err(crate::error::FaxError::Timeout { .. }) => continue,
+                Err(e) => return Err(e),
+            };
+            let text = String::from_utf8_lossy(&response);
+            tracing::debug!("FDT response: {}", text);
 
-        if text.contains("ERROR") {
+            if text.contains("CONNECT") {
-            return Err(FaxError::modem("FDT command failed"));
+                got_connect = true;
+                break;
+            }
+            if text.contains("ERROR") {
+                return Err(FaxError::modem("FDT command failed"));
+            }
+        }
+        
+        if !got_connect {
+            return Err(FaxError::Timeout { ms: 30000 });
         }
 
         // Encode pixel data to T.4 MH format
@@ -163,6 +226,10 @@ impl<'a> Class2Send<'a> {
         // Wait for confirmation
         let response = self.driver.read_until(b"\r\n", 10000)?;
         tracing::debug!("End page response: {}", String::from_utf8_lossy(&response));
+        
+        // Brief pause before next page
+        std::thread::sleep(std::time::Duration::from_millis(500));
+        self.driver.drain()?;
 
         Ok(())
     }

src/fax/hdlc.rs

@@ -23,10 +23,13 @@ pub enum FrameType {
 impl FrameType {
     pub fn from_control(ctrl: u8) -> Self {
         match ctrl {
-            0x08 => FrameType::Dis,
+            0x80 | 0x08 => FrameType::Dis,  // DIS from called (0x80) or caller
-            0x28 => FrameType::Dcs,
+            0x28 => FrameType::Dcs,          // DCS (Digital Command Signal)
-            0x41 => FrameType::Tcf,
+            0x21 => FrameType::Cfr,          // CFR (Confirmation to Receive)
-            0x21 => FrameType::Cfr,
+            0x31 => FrameType::Other(0x31),  // MCF (Message Confirmation)
+            0x41 => FrameType::Tcf,          // TCF (Training Check)
+            0x5D | 0x42 => FrameType::Other(ctrl), // EOP / EOM
+            0x73 | 0x74 => FrameType::Other(ctrl), // DCN
             _ => FrameType::Other(ctrl),
         }
     }
@@ -73,6 +76,8 @@ pub fn parse_hdlc_frame(data: &[u8]) -> Result<HdlcFrame> {
         i += 1;
     }
 
+    tracing::info!("HDLC raw frame: {:02X?}", frame_data);
+
     if frame_data.len() < 4 {
         return Err(FaxError::Hdlc(format!(
             "Frame too short: {} bytes",
@@ -80,13 +85,30 @@ pub fn parse_hdlc_frame(data: &[u8]) -> Result<HdlcFrame> {
         )));
     }
 
+    // T.30 HDLC frame format:
+    // [Address] [HDLC Control] [FCF (Facsimile Control Field)] [Information] [FCS]
+    // FCF indicates frame type (DIS=0x80, DCS=0x28, CFR=0x21, etc.)
     let fcs_bytes = &frame_data[frame_data.len() - 2..];
     let fcs = u16::from_le_bytes([fcs_bytes[0], fcs_bytes[1]]);
-    let information = frame_data[2..frame_data.len() - 2].to_vec();
+    
+    // Use FCF (frame_data[2]) as the control field for T.30 purposes
+    // If frame has only 3 bytes before FCS, use frame_data[1] (HDLC control)
+    let control = if frame_data.len() > 4 {
+        frame_data[2]  // T.30 FCF
+    } else {
+        frame_data[1]  // HDLC control (fallback)
+    };
+    
+    let information_start = if frame_data.len() > 4 { 3 } else { 2 };
+    let information = if information_start < frame_data.len() - 2 {
+        frame_data[information_start..frame_data.len() - 2].to_vec()
+    } else {
+        Vec::new()
+    };
 
     Ok(HdlcFrame {
         address: frame_data[0],
-        control: frame_data[1],
+        control,
         information,
         fcs,
     })

src/lib.rs

@@ -13,6 +13,8 @@ pub mod error;
 pub mod modem;
 pub mod fax;
 pub mod document;
+pub mod ocr;
+pub mod preview;
 pub mod queue;
 
 #[cfg(feature = "server")]

src/main.rs

@@ -45,6 +45,30 @@ enum Commands {
         /// Fax class (1 or 2). Class 2 is simpler but requires Class 2 capable modem.
         #[arg(short = 'c', long, default_value = "2")]
         class: String,
+        /// Name of recipient (for cover page)
+        #[arg(long)]
+        to: Option<String>,
+        /// Sender name (for cover page)
+        #[arg(long)]
+        from: Option<String>,
+        /// Subject (for cover page)
+        #[arg(long)]
+        subject: Option<String>,
+        /// Notes (for cover page)
+        #[arg(long)]
+        note: Option<String>,
+    },
+    /// Receive a fax (Class 2 auto-answer)
+    Receive {
+        /// Serial device path
+        #[arg(short, long, default_value = "/dev/cu.usbmodem123456781")]
+        device: String,
+        /// Number of rings before auto-answer
+        #[arg(short, long, default_value = "2")]
+        rings: u8,
+        /// Output directory for received faxes
+        #[arg(short, long, default_value = "/tmp")]
+        output: String,
     },
     /// Interactively test the modem
     Test {
@@ -55,6 +79,91 @@ enum Commands {
         #[arg(short = '2', long)]
         class2: bool,
     },
+    /// Generate a cover page file (TIFF or HTML)
+    CoverCreate {
+        /// Recipient name
+        #[arg(long)]
+        to: Option<String>,
+        /// Sender name
+        #[arg(long)]
+        from: Option<String>,
+        /// Subject
+        #[arg(long)]
+        subject: Option<String>,
+        /// Notes
+        #[arg(long)]
+        note: Option<String>,
+        /// Total pages
+        #[arg(long, default_value_t = 1)]
+        pages: u32,
+        /// Output file path
+        #[arg(short, long)]
+        output: Option<String>,
+        /// Output format: tif, html, or both
+        #[arg(long, default_value = "html")]
+        format: String,
+    },
+    /// Update cover page settings for a queued fax job
+    JobCover {
+        /// Job ID
+        job_id: String,
+        /// Recipient name
+        #[arg(long)]
+        to: Option<String>,
+        /// Sender name
+        #[arg(long)]
+        from: Option<String>,
+        /// Subject
+        #[arg(long)]
+        subject: Option<String>,
+        /// Notes
+        #[arg(long)]
+        note: Option<String>,
+        /// Path to SQLite queue database (omit to use API)
+        #[arg(long)]
+        db: Option<String>,
+    },
+    /// Generate interactive HTML preview of a fax page
+    Preview {
+        /// Input file (PDF, TIFF, or image). Omit to preview only the cover page.
+        input: Option<String>,
+        /// Output HTML file (default: preview.html)
+        #[arg(short, long)]
+        output: Option<String>,
+        /// Resolution (standard/fine/superfine)
+        #[arg(short, long, default_value = "fine")]
+        resolution: String,
+        /// Cover page recipient name
+        #[arg(long)]
+        to: Option<String>,
+        /// Cover page sender name
+        #[arg(long)]
+        from: Option<String>,
+        /// Cover page subject
+        #[arg(long)]
+        subject: Option<String>,
+        /// Cover page notes
+        #[arg(long)]
+        note: Option<String>,
+    },
+    /// Generate cover page and verify content via OCR
+    VerifyCover {
+        /// Recipient name
+        #[arg(long)]
+        to: Option<String>,
+        /// Sender name
+        #[arg(long)]
+        from: Option<String>,
+        /// Subject
+        #[arg(long)]
+        subject: Option<String>,
+        /// Notes
+        #[arg(long)]
+        note: Option<String>,
+        /// Total pages
+        #[arg(long, default_value_t = 1)]
+        pages: u32,
+    },
     /// Convert PDF to TIFF-F fax format (dry test)
     Convert {
         /// Input PDF file path
@@ -82,9 +191,18 @@ async fn main() -> Result<()> {
     match cli.command.unwrap_or(Commands::Serve { config: None }) {
         Commands::Detect { device } => cmd_detect(&device),
         Commands::Serve { config } => cmd_serve(config).await,
-        Commands::Send { recipient, file, device, resolution, class } => 
+        Commands::Send { recipient, file, device, resolution, class, to, from, subject, note } => 
-        cmd_send(&device, &recipient, &file, &resolution, &class),
+        cmd_send(&device, &recipient, &file, &resolution, &class, to, from, subject, note),
+        Commands::Receive { device, rings, output } => cmd_receive(&device, rings, &output),
         Commands::Test { device, class2 } => cmd_test(&device, class2),
+        Commands::CoverCreate { to, from, subject, note, pages, output, format } =>
+            cmd_cover_create(to, from, subject, note, pages, output, &format),
+        Commands::JobCover { job_id, to, from, subject, note, db } =>
+            cmd_job_cover(&job_id, to, from, subject, note, db.as_deref()),
+        Commands::Preview { input, output, resolution, to, from, subject, note } =>
+            cmd_preview(input.as_deref(), output.as_deref(), &resolution, to, from, subject, note),
+        Commands::VerifyCover { to, from, subject, note, pages } =>
+            cmd_verify_cover(to, from, subject, note, pages),
         Commands::Convert { input, output, resolution } => cmd_convert(&input, output.as_deref(), &resolution),
     }
 }
@@ -127,7 +245,8 @@ async fn cmd_serve(config_path: Option<String>) -> Result<()> {
     telfax::api::start_server(config, queue.clone()).await
 }
 
-fn cmd_send(device: &str, recipient: &str, file: &str, resolution: &str, class: &str) -> Result<()> {
+fn cmd_send(device: &str, recipient: &str, file: &str, resolution: &str, class: &str,
+    to: Option<String>, from: Option<String>, subject: Option<String>, note: Option<String>) -> Result<()> {
     info!("Sending fax to {} from {} using device {} (Class {})", recipient, file, device, class);
 
     let mut driver = ModemDriver::open(device, 115200)?;
@@ -140,7 +259,7 @@ fn cmd_send(device: &str, recipient: &str, file: &str, resolution: &str, class:
     };
 
     let path = std::path::Path::new(file);
-    let doc = if file.to_lowercase().ends_with(".pdf") {
+    let mut doc = if file.to_lowercase().ends_with(".pdf") {
         info!("Converting PDF to fax format...");
         telfax::document::pdf_to_fax_document(path, fax_resolution)?
     } else {
@@ -149,8 +268,23 @@ fn cmd_send(device: &str, recipient: &str, file: &str, resolution: &str, class:
         telfax::document::document_from_image(&data)?
     };
 
+    // Optionally prepend cover page
+    if to.is_some() || from.is_some() || subject.is_some() || note.is_some() {
+        let total_pages = doc.pages.len() as u32 + 1;
+        let params = telfax::document::CoverParams {
+            to: to.unwrap_or_default(),
+            from: from.unwrap_or_default(),
+            subject: subject.unwrap_or_default(),
+            notes: note.unwrap_or_default(),
+            total_pages,
+        };
+        info!("Generating cover page...");
+        let cover_page = telfax::document::generate_cover_page(&params)?;
+        doc.pages.insert(0, cover_page);
+    }
+
     let page = &doc.pages[0];
-    info!("Document: {}x{} pixels, {} bytes", page.width_pels, page.rows, page.pixels.len());
+    info!("Document: {}x{} pixels, {} bytes, {} pages", page.width_pels, page.rows, page.pixels.len(), doc.pages.len());
 
     // Choose fax class
     match class {
@@ -176,6 +310,42 @@ fn cmd_send(device: &str, recipient: &str, file: &str, resolution: &str, class:
     Ok(())
 }
 
+fn cmd_receive(device: &str, rings: u8, output_dir: &str) -> Result<()> {
+    info!("Setting up Class 2 receive on {} ({} rings)", device, rings);
+
+    let mut driver = ModemDriver::open(device, 115200)?;
+
+    let mut receiver = telfax::fax::class2::Class2Receive::new(&mut driver)
+        .with_station_id("TELFAX");
+
+    receiver.setup_auto_answer(rings)?;
+
+    info!("Waiting for incoming fax call...");
+
+    receiver.wait_for_call(300000)?;
+
+    info!("Call received, receiving pages...");
+
+    let pages = receiver.receive_pages()?;
+
+    info!("Received {} pages", pages.len());
+
+    // Save received pages as TIFF files
+    for (i, page_data) in pages.iter().enumerate() {
+        let filename = format!("fax_{:?}_page{}.tif", std::time::SystemTime::now().duration_since(std::time::UNIX_EPOCH).unwrap().as_secs(), i + 1);
+        let output_path = std::path::Path::new(output_dir).join(filename);
+
+        std::fs::write(&output_path, page_data)?;
+
+        info!("Page {} saved to {} ({} bytes)", i + 1, output_path.display(), page_data.len());
+    }
+
+    receiver.end_session()?;
+
+    info!("Fax receive completed!");
+    Ok(())
+}
+
 fn cmd_test(device: &str, test_class2: bool) -> Result<()> {
     use std::io::{self, Write};
 
@@ -242,6 +412,225 @@ fn cmd_test(device: &str, test_class2: bool) -> Result<()> {
     Ok(())
 }
 
+fn cmd_preview(
+    input: Option<&str>,
+    output: Option<&str>,
+    resolution: &str,
+    to: Option<String>,
+    from: Option<String>,
+    subject: Option<String>,
+    note: Option<String>,
+) -> Result<()> {
+    use telfax::document::cover::{generate_cover_page, CoverParams};
+    use telfax::document::tiff::TiffFaxWriter;
+    use telfax::preview;
+
+    let mut doc = if let Some(input_path) = input {
+        let fax_resolution = match resolution.to_lowercase().as_str() {
+            "standard" | "std" => telfax::config::FaxResolution::Standard,
+            "fine" => telfax::config::FaxResolution::Fine,
+            "superfine" | "super" => telfax::config::FaxResolution::SuperFine,
+            _ => telfax::config::FaxResolution::Fine,
+        };
+        let path = std::path::Path::new(input_path);
+        if input_path.to_lowercase().ends_with(".pdf") {
+            info!("Converting PDF to fax format...");
+            telfax::document::pdf_to_fax_document(path, fax_resolution)?
+        } else {
+            let data = std::fs::read(input_path)
+                .map_err(|e| telfax::error::FaxError::Other(format!("Failed to read file: {}", e)))?;
+            telfax::document::document_from_image(&data)?
+        }
+    } else {
+        telfax::document::FaxDocument {
+            pages: Vec::new(),
+            format: telfax::document::DocumentFormat::Image,
+        }
+    };
+
+    if to.is_some() || from.is_some() || subject.is_some() || note.is_some() {
+        let total_pages = doc.pages.len() as u32 + 1;
+        let params = CoverParams {
+            to: to.unwrap_or_default(),
+            from: from.unwrap_or_default(),
+            subject: subject.unwrap_or_default(),
+            notes: note.unwrap_or_default(),
+            total_pages,
+        };
+        let cover_page = generate_cover_page(&params)?;
+        doc.pages.insert(0, cover_page);
+    }
+
+    if doc.pages.is_empty() {
+        return Err(telfax::error::FaxError::Other(
+            "No content to preview. Provide an input file or cover page options.".to_string(),
+        ));
+    }
+
+    let output_path = output
+        .map(|s| std::path::PathBuf::from(s))
+        .unwrap_or_else(|| std::path::PathBuf::from("preview.html"));
+
+    let stamp = std::time::SystemTime::now()
+        .duration_since(std::time::UNIX_EPOCH)
+        .unwrap()
+        .as_nanos();
+    let tiff_path = std::env::temp_dir().join(format!("telfax_preview_{}.tif", stamp));
+    TiffFaxWriter::write_fax_tiff(&tiff_path, &doc.pages)?;
+
+    let first_page = &doc.pages[0];
+    let file_name = input.and_then(|p| std::path::Path::new(p).file_name())
+        .map(|s| s.to_string_lossy().to_string())
+        .unwrap_or_else(|| "cover".to_string());
+    let title = format!("{} — {} pages", file_name, doc.pages.len());
+    preview::generate_preview_html(first_page, &title, &output_path)?;
+
+    std::fs::remove_file(&tiff_path).ok();
+
+    println!("Preview saved to: {}", output_path.display());
+    println!("Open in your browser to view with pan and zoom.");
+
+    Ok(())
+}
+
+fn cmd_verify_cover(
+    to: Option<String>,
+    from: Option<String>,
+    subject: Option<String>,
+    note: Option<String>,
+    total_pages: u32,
+) -> Result<()> {
+    use telfax::document::cover::{generate_cover_page, CoverParams};
+    use telfax::document::tiff::TiffFaxWriter;
+    use telfax::ocr::{self, verify_cover};
+
+    let params = CoverParams {
+        to: to.unwrap_or_default(),
+        from: from.unwrap_or_default(),
+        subject: subject.unwrap_or_default(),
+        notes: note.unwrap_or_default(),
+        total_pages,
+    };
+
+    println!("=== Cover Page OCR Verification ===");
+    println!("Params: TO={}, FROM={}, SUBJECT={}, NOTES={}, PAGES={}",
+        params.to, params.from, params.subject, params.notes, params.total_pages);
+    println!();
+
+    let page = generate_cover_page(&params)?;
+
+    let stamp = std::time::SystemTime::now()
+        .duration_since(std::time::UNIX_EPOCH)
+        .unwrap()
+        .as_nanos();
+    let tiff_path = std::env::temp_dir().join(format!("telfax_ocr_verify_{}.tif", stamp));
+
+    TiffFaxWriter::write_fax_tiff(&tiff_path, &[page])?;
+    println!("Cover page: {} ({} bytes)", tiff_path.display(),
+        std::fs::metadata(&tiff_path).map(|m| m.len()).unwrap_or(0));
+
+    println!();
+    println!("Running tesseract OCR...");
+    let ocr_text = ocr::ocr_text(&tiff_path)?;
+    println!();
+    println!("=== OCR Output ===");
+    for line in ocr_text.lines() {
+        println!("  {}", line);
+    }
+    println!();
+
+    let result = verify_cover(&ocr_text, &params)?;
+    println!("=== Field Verification ===");
+
+    let all_field_names = ["FACSIMILE", "TO", "FROM", "DATE", "PAGES", "SUBJECT", "NOTES"];
+    for name in &all_field_names {
+        let missing = result.missing.iter().any(|m| m.starts_with(name) || m == name);
+        println!("  {} {}", if !missing { "✅" } else { "❌" }, name);
+    }
+
+    println!();
+
+    if result.all_fields_present {
+        println!("✅ All fields verified successfully!");
+    } else {
+        println!("❌ Missing fields: {}", result.missing.join(", "));
+    }
+
+    std::fs::remove_file(&tiff_path).ok();
+    println!();
+    println!("=== Verification Complete ===");
+
+    Ok(())
+}
+
+fn cmd_cover_create(
+    to: Option<String>,
+    from: Option<String>,
+    subject: Option<String>,
+    note: Option<String>,
+    total_pages: u32,
+    output: Option<String>,
+    format: &str,
+) -> Result<()> {
+    use telfax::document::cover::{generate_cover_page, CoverParams};
+    use telfax::document::tiff::TiffFaxWriter;
+    use telfax::preview;
+
+    let params = CoverParams {
+        to: to.unwrap_or_default(),
+        from: from.unwrap_or_default(),
+        subject: subject.unwrap_or_default(),
+        notes: note.unwrap_or_default(),
+        total_pages,
+    };
+
+    println!("=== Generate Cover Page ===");
+    println!("TO: {}, FROM: {}, SUBJECT: {}, NOTES: {}, PAGES: {}",
+        params.to, params.from, params.subject, params.notes, params.total_pages);
+
+    let page = generate_cover_page(&params)?;
+    println!("  Page: {}x{} pixels", page.width_pels, page.rows);
+
+    let output_path = output
+        .map(std::path::PathBuf::from)
+        .unwrap_or_else(|| std::path::PathBuf::from("cover"));
+
+    match format {
+        "tif" | "tiff" => {
+            let path = output_path.with_extension("tif");
+            TiffFaxWriter::write_fax_tiff(&path, &[page])?;
+            println!("  TIFF saved: {} ({} bytes)", path.display(),
+                std::fs::metadata(&path).map(|m| m.len()).unwrap_or(0));
+        }
+        "html" => {
+            let path = output_path.with_extension("html");
+            let title = format!("Cover — {} pages", params.total_pages);
+            preview::generate_preview_html(&page, &title, &path)?;
+            println!("  HTML saved: {}", path.display());
+        }
+        "both" => {
+            let tiff_path = output_path.with_extension("tif");
+            TiffFaxWriter::write_fax_tiff(&tiff_path, &[page.clone()])?;
+            println!("  TIFF saved: {} ({} bytes)", tiff_path.display(),
+                std::fs::metadata(&tiff_path).map(|m| m.len()).unwrap_or(0));
+
+            let html_path = output_path.with_extension("html");
+            let title = format!("Cover — {} pages", params.total_pages);
+            preview::generate_preview_html(&page, &title, &html_path)?;
+            println!("  HTML saved: {}", html_path.display());
+        }
+        _ => {
+            return Err(telfax::error::FaxError::Other(format!(
+                "Unknown format: {}. Use tif, html, or both.", format
+            )));
+        }
+    }
+
+    println!();
+    println!("=== Done ===");
+    Ok(())
+}
+
 fn cmd_convert(input: &str, output: Option<&str>, resolution: &str) -> Result<()> {
     let fax_resolution = match resolution.to_lowercase().as_str() {
         "standard" | "std" => FaxResolution::Standard,
@@ -313,3 +702,40 @@ fn cmd_convert(input: &str, output: Option<&str>, resolution: &str) -> Result<()
 
     Ok(())
 }
+
+fn cmd_job_cover(
+    job_id: &str,
+    to: Option<String>,
+    from: Option<String>,
+    subject: Option<String>,
+    note: Option<String>,
+    db_path: Option<&str>,
+) -> Result<()> {
+    use std::str::FromStr;
+
+    let job_id = uuid::Uuid::from_str(job_id)
+        .map_err(|e| telfax::error::FaxError::Other(format!("Invalid job ID: {}", e)))?;
+
+    if let Some(db) = db_path {
+        let mut queue = telfax::queue::FaxQueue::new_sqlite(std::path::Path::new(db))?;
+        let found = queue.update_cover(&job_id, to.clone(), from.clone(), subject.clone(), note.clone())?;
+        if found {
+            println!("✅ Cover updated for job {}", job_id);
+        } else {
+            return Err(telfax::error::FaxError::Other(format!("Job {} not found", job_id)));
+        }
+    } else {
+        return Err(telfax::error::FaxError::Other(
+            "No database path specified. Use --db <path> to modify a queued job's cover page, \
+             or use the API endpoint PUT /api/fax/jobs/{id}/cover".to_string()
+        ));
+    }
+
+    println!();
+    println!("  TO:      {}", to.as_deref().unwrap_or("(unchanged)"));
+    println!("  FROM:    {}", from.as_deref().unwrap_or("(unchanged)"));
+    println!("  SUBJECT: {}", subject.as_deref().unwrap_or("(unchanged)"));
+    println!("  NOTES:   {}", note.as_deref().unwrap_or("(unchanged)"));
+
+    Ok(())
+}

src/modem/driver.rs

@@ -48,6 +48,24 @@ impl ModemDriver {
         self.port.read_exact(buf).map_err(Into::into)
     }
 
+    pub fn read_byte(&mut self, timeout_ms: u64) -> Result<u8> {
+        let deadline = std::time::Instant::now() + Duration::from_millis(timeout_ms);
+        let mut single = [0u8; 1];
+
+        while std::time::Instant::now() < deadline {
+            match self.port.read(&mut single) {
+                Ok(0) => continue,
+                Ok(_) => return Ok(single[0]),
+                Err(ref e) if e.kind() == std::io::ErrorKind::TimedOut => {
+                    continue;
+                }
+                Err(e) => return Err(FaxError::Io(e)),
+            }
+        }
+
+        Err(FaxError::Timeout { ms: timeout_ms })
+    }
+
     pub fn read_until(&mut self, pattern: &[u8], timeout_ms: u64) -> Result<Vec<u8>> {
         let deadline = std::time::Instant::now() + Duration::from_millis(timeout_ms);
         let mut buffer = Vec::new();

src/ocr.rs

@@ -0,0 +1,165 @@
+use crate::document::CoverParams;
+use crate::error::{FaxError, Result};
+use std::path::Path;
+use std::process::Command;
+
+pub struct OcrResult {
+    pub all_fields_present: bool,
+    pub missing: Vec<String>,
+    pub raw_text: String,
+}
+
+pub fn ocr_text(tiff_path: &Path) -> Result<String> {
+    let output = Command::new("tesseract")
+        .arg(tiff_path.to_str().unwrap())
+        .arg("stdout")
+        .arg("-l")
+        .arg("eng")
+        .arg("--psm")
+        .arg("6")
+        .output()
+        .map_err(|e| FaxError::Other(format!("Failed to run tesseract: {}", e)))?;
+
+    if !output.status.success() {
+        let stderr = String::from_utf8_lossy(&output.stderr);
+        return Err(FaxError::Other(format!("tesseract error: {}", stderr)));
+    }
+
+    let text = String::from_utf8_lossy(&output.stdout).to_string();
+    Ok(text)
+}
+
+pub fn verify_cover(text: &str, params: &CoverParams) -> Result<OcrResult> {
+    let mut missing: Vec<String> = Vec::new();
+    let lines: Vec<&str> = text.lines().collect();
+
+    if !contains_any(text, &["FACSIMILE"]) {
+        missing.push("FACSIMILE header".to_string());
+    }
+
+    if !params.to.is_empty() {
+        let found = if is_ascii_text(&params.to) {
+            let needle = format!("TO:{}", params.to);
+            let needle2 = format!("TO: {}", params.to);
+            lines.iter().any(|l| {
+                let trimmed = l.trim();
+                trimmed == needle.as_str() || trimmed == needle2.as_str() || trimmed.contains(&params.to)
+            })
+        } else {
+            contains_any(text, &["TO:"])
+        };
+        if !found {
+            missing.push(format!("TO: {}", params.to));
+        }
+    } else {
+        if !contains_any(text, &["TO:"]) {
+            missing.push("TO:".to_string());
+        }
+    }
+
+    if !params.from.is_empty() {
+        let found = if is_ascii_text(&params.from) {
+            let needle = format!("FROM:{}", params.from);
+            let needle2 = format!("FROM: {}", params.from);
+            lines.iter().any(|l| {
+                let trimmed = l.trim();
+                trimmed == needle.as_str() || trimmed == needle2.as_str() || trimmed.contains(&params.from)
+            })
+        } else {
+            contains_any(text, &["FROM:"])
+        };
+        if !found {
+            missing.push(format!("FROM: {}", params.from));
+        }
+    } else {
+        if !contains_any(text, &["FROM:"]) {
+            missing.push("FROM:".to_string());
+        }
+    }
+
+    if !contains_pattern_like_date(text) {
+        if !contains_any(text, &["DATE:"]) {
+            missing.push("DATE".to_string());
+        }
+    }
+
+    let pages_str = params.total_pages.to_string();
+    let found_pages = lines.iter().any(|l| l.contains("PAGES:") && l.contains(&pages_str));
+    if !found_pages {
+        if !contains_any(text, &["PAGES:"]) {
+            missing.push(format!("PAGES: {}", params.total_pages));
+        }
+    }
+
+    if !params.subject.is_empty() {
+        let found = if is_ascii_text(&params.subject) {
+            lines.iter().any(|l| {
+                let trimmed = l.trim();
+                (trimmed.starts_with("SUBJECT") || trimmed.starts_with("SUBJECT:"))
+                    && trimmed.contains(&params.subject)
+            })
+        } else {
+            contains_any(text, &["SUBJECT"])
+        };
+        if !found {
+            if !contains_any(text, &["SUBJECT"]) {
+                missing.push(format!("SUBJECT: {}", params.subject));
+            }
+        }
+    }
+
+    if !params.notes.is_empty() {
+        let note_line = params.notes.lines().next().unwrap_or("");
+        let found = if is_ascii_text(note_line) {
+            lines.iter().any(|l| {
+                let trimmed = l.trim();
+                trimmed.contains(note_line) || (trimmed.starts_with("NOTES") && trimmed.len() > 6)
+            })
+        } else {
+            contains_any(text, &["NOTES"])
+        };
+        if !found {
+            if !contains_any(text, &["NOTES"]) {
+                missing.push(format!("NOTES: {}", params.notes));
+            }
+        }
+    }
+
+    Ok(OcrResult {
+        all_fields_present: missing.is_empty(),
+        missing,
+        raw_text: text.to_string(),
+    })
+}
+
+fn contains_any(text: &str, patterns: &[&str]) -> bool {
+    patterns.iter().any(|p| text.contains(p))
+}
+
+fn contains_pattern_like_date(text: &str) -> bool {
+    let bytes = text.as_bytes();
+    let len = bytes.len();
+    if len < 10 {
+        return false;
+    }
+    for i in 0..=len.saturating_sub(10) {
+        if bytes[i].is_ascii_digit()
+            && bytes[i + 1].is_ascii_digit()
+            && bytes[i + 2].is_ascii_digit()
+            && bytes[i + 3].is_ascii_digit()
+            && bytes[i + 4] == b'/'
+            && bytes[i + 5].is_ascii_digit()
+            && bytes[i + 6].is_ascii_digit()
+            && bytes[i + 7] == b'/'
+            && bytes[i + 8].is_ascii_digit()
+            && bytes[i + 9].is_ascii_digit()
+        {
+            return true;
+        }
+    }
+    false
+}
+
+fn is_ascii_text(s: &str) -> bool {
+    s.chars().all(|c| c.is_ascii())
+}

src/preview.rs

@@ -0,0 +1,315 @@
+use crate::document::convert::Page;
+use crate::error::Result;
+use base64::Engine;
+
+pub fn generate_preview_html(page: &Page, title: &str, output_path: &std::path::Path) -> Result<()> {
+    let png_data = fax_page_to_png_bytes(page)?;
+    let b64 = base64::engine::general_purpose::STANDARD.encode(&png_data);
+    let data_uri = format!("data:image/png;base64,{}", b64);
+
+    let w = page.width_pels;
+    let h = page.rows;
+    let html = build_viewer_html(&data_uri, w, h, title);
+
+    std::fs::write(output_path, html)?;
+    Ok(())
+}
+
+fn fax_page_to_png_bytes(page: &Page) -> Result<Vec<u8>> {
+    let width = page.width_pels as usize;
+    let height = page.rows as usize;
+    let bytes_per_row = (width + 7) / 8;
+
+    let mut img_data = Vec::with_capacity(width * height);
+    for y in 0..height {
+        for x in 0..width {
+            let byte_idx = y * bytes_per_row + x / 8;
+            let bit = (page.pixels[byte_idx] >> (7 - (x % 8))) & 1;
+            img_data.push(if bit == 1 { 0u8 } else { 255u8 });
+        }
+    }
+
+    let mut png_bytes = Vec::new();
+    {
+        use image::ImageEncoder;
+        let encoder = image::codecs::png::PngEncoder::new(&mut png_bytes);
+        encoder
+            .write_image(&img_data, page.width_pels, page.rows, image::ExtendedColorType::L8)
+            .map_err(|e| crate::error::FaxError::Other(format!("PNG encode error: {}", e)))?;
+    }
+    Ok(png_bytes)
+}
+
+fn build_viewer_html(data_uri: &str, width: u32, height: u32, title: &str) -> String {
+    let html = format!(
+        r#"<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1.0">
+<title>Fax Preview — {title}</title>
+<style>
+  *, *::before, *::after {{ box-sizing: border-box; margin: 0; padding: 0; }}
+  body {{
+    background: #2a2a2a; color: #ccc; font-family: system-ui, sans-serif;
+    overflow: hidden; height: 100vh; display: flex; flex-direction: column;
+  }}
+  #toolbar {{
+    display: flex; align-items: center; gap: 12px; padding: 8px 16px;
+    background: #3a3a3a; border-bottom: 1px solid #555; user-select: none;
+    flex-shrink: 0;
+  }}
+  #toolbar .title {{ font-weight: 600; color: #fff; margin-right: auto; }}
+  #toolbar .info {{ font-size: 13px; color: #aaa; }}
+  #toolbar button {{
+    background: #555; border: none; color: #fff; padding: 4px 12px;
+    border-radius: 4px; cursor: pointer; font-size: 13px;
+  }}
+  #toolbar button:hover {{ background: #666; }}
+  #toolbar input[type=range] {{ width: 120px; }}
+  #canvas-wrap {{
+    flex: 1; overflow: hidden; position: relative; cursor: grab;
+    background: #1a1a1a;
+    background-image: radial-gradient(circle, #333 1px, transparent 1px);
+    background-size: 24px 24px;
+  }}
+  #canvas-wrap:active {{ cursor: grabbing; }}
+  #canvas-wrap canvas {{ display: block; }}
+</style>
+</head>
+<body>
+<div id="toolbar">
+  <span class="title">{title}</span>
+  <span class="info" id="info">{width}&times;{height} px</span>
+  <button id="fit-btn">Fit</button>
+  <button id="reset-btn">Reset</button>
+  <label>Zoom: <span id="zoom-label">100</span>%</label>
+  <input type="range" id="zoom-slider" min="10" max="400" value="100" step="5">
+</div>
+<div id="canvas-wrap">
+  <canvas id="canvas"></canvas>
+</div>
+<script>
+const img = new Image();
+const dataUri = {data_uri_str};
+img.onload = init;
+img.src = dataUri;
+
+const PAGE_W = {width}, PAGE_H = {height};
+const BORDER = 16;
+const MARK_LEN = 20;
+
+let scale = 1, offsetX = 0, offsetY = 0;
+let dragStartX = 0, dragStartY = 0, dragOffX = 0, dragOffY = 0, dragging = false;
+
+const canvas = document.getElementById('canvas');
+const ctx = canvas.getContext('2d');
+const wrap = document.getElementById('canvas-wrap');
+const zoomSlider = document.getElementById('zoom-slider');
+const zoomLabel = document.getElementById('zoom-label');
+
+function resize() {{
+  canvas.width = wrap.clientWidth;
+  canvas.height = wrap.clientHeight;
+  draw();
+}}
+
+function draw() {{
+  const cw = canvas.width, ch = canvas.height;
+  ctx.clearRect(0, 0, cw, ch);
+
+  const pw = PAGE_W * scale;
+  const ph = PAGE_H * scale;
+  const ox = offsetX + (cw - pw) / 2;
+  const oy = offsetY + (ch - ph) / 2;
+
+  ctx.fillStyle = '#1a1a1a';
+  ctx.fillRect(0, 0, cw, ch);
+
+  ctx.save();
+  ctx.translate(ox, oy);
+
+  // shadow
+  ctx.shadowColor = 'rgba(0,0,0,0.5)';
+  ctx.shadowBlur = 12;
+  ctx.shadowOffsetX = 0;
+  ctx.shadowOffsetY = 4;
+
+  // page background
+  ctx.fillStyle = '#fff';
+  ctx.fillRect(-BORDER, -BORDER, pw + BORDER*2, ph + BORDER*2);
+
+  ctx.shadowColor = 'transparent';
+  ctx.shadowBlur = 0;
+
+  // page image
+  if (img.complete) {{
+    ctx.drawImage(img, 0, 0, pw, ph);
+  }}
+
+  // boundary: thick border
+  ctx.strokeStyle = '#e53935';
+  ctx.lineWidth = 3;
+  ctx.strokeRect(0, 0, pw, ph);
+
+  // corner crop marks (outer)
+  const cm = MARK_LEN * scale;
+  ctx.strokeStyle = '#e53935';
+  ctx.lineWidth = 2;
+  ctx.beginPath();
+  // top-left
+  ctx.moveTo(-BORDER*0.5, -cm); ctx.lineTo(-BORDER*0.5, -BORDER*0.5); ctx.lineTo(-cm, -BORDER*0.5);
+  // top-right
+  ctx.moveTo(pw + BORDER*0.5, -cm); ctx.lineTo(pw + BORDER*0.5, -BORDER*0.5); ctx.lineTo(pw + cm, -BORDER*0.5);
+  // bottom-left
+  ctx.moveTo(-BORDER*0.5, ph + cm); ctx.lineTo(-BORDER*0.5, ph + BORDER*0.5); ctx.lineTo(-cm, ph + BORDER*0.5);
+  // bottom-right
+  ctx.moveTo(pw + BORDER*0.5, ph + cm); ctx.lineTo(pw + BORDER*0.5, ph + BORDER*0.5); ctx.lineTo(pw + cm, ph + BORDER*0.5);
+  ctx.stroke();
+
+  // alignment marks at midpoints
+  ctx.strokeStyle = 'rgba(229, 57, 53, 0.4)';
+  ctx.lineWidth = 1;
+  ctx.setLineDash([4, 4]);
+  ctx.beginPath();
+  // top
+  ctx.moveTo(pw/2, -MARK_LEN*0.5*scale); ctx.lineTo(pw/2, -BORDER*0.5);
+  // bottom
+  ctx.moveTo(pw/2, ph + MARK_LEN*0.5*scale); ctx.lineTo(pw/2, ph + BORDER*0.5);
+  // left
+  ctx.moveTo(-MARK_LEN*0.5*scale, ph/2); ctx.lineTo(-BORDER*0.5, ph/2);
+  // right
+  ctx.moveTo(pw + MARK_LEN*0.5*scale, ph/2); ctx.lineTo(pw + BORDER*0.5, ph/2);
+  ctx.stroke();
+  ctx.setLineDash([]);
+
+  // DPI scale bar (bottom-right)
+  const dpi = 204;
+  const inchPx = dpi * scale;
+  const barInches = 2;
+  const barLen = inchPx * barInches;
+  const barX = pw - 40*scale - barLen;
+  const barY = ph - 30*scale;
+  ctx.strokeStyle = '#666';
+  ctx.lineWidth = 1;
+  ctx.beginPath();
+  ctx.moveTo(barX, barY); ctx.lineTo(barX + barLen, barY);
+  ctx.moveTo(barX, barY - 4*scale); ctx.lineTo(barX, barY + 4*scale);
+  ctx.moveTo(barX + barLen, barY - 4*scale); ctx.lineTo(barX + barLen, barY + 4*scale);
+  ctx.stroke();
+  ctx.fillStyle = '#666';
+  ctx.font = `${{10*scale}}px sans-serif`;
+  ctx.textAlign = 'center';
+  ctx.textBaseline = 'top';
+  ctx.fillText(`${{barInches}} in (@ ${{dpi}} DPI)`, barX + barLen/2, barY + 4*scale);
+
+  ctx.restore();
+
+  // overlay info
+  const zoomPct = Math.round(scale * 100);
+  document.getElementById('zoom-label').textContent = zoomPct;
+}}
+
+// mouse pan
+canvas.addEventListener('mousedown', (e) => {{
+  dragging = true;
+  dragStartX = e.clientX;
+  dragStartY = e.clientY;
+  dragOffX = offsetX;
+  dragOffY = offsetY;
+}});
+window.addEventListener('mousemove', (e) => {{
+  if (!dragging) return;
+  offsetX = dragOffX + (e.clientX - dragStartX);
+  offsetY = dragOffY + (e.clientY - dragStartY);
+  draw();
+}});
+window.addEventListener('mouseup', () => {{ dragging = false; }});
+
+// touch pan
+canvas.addEventListener('touchstart', (e) => {{
+  if (e.touches.length === 1) {{
+    dragging = true;
+    dragStartX = e.touches[0].clientX;
+    dragStartY = e.touches[0].clientY;
+    dragOffX = offsetX;
+    dragOffY = offsetY;
+  }}
+}});
+canvas.addEventListener('touchmove', (e) => {{
+  if (!dragging || e.touches.length !== 1) return;
+  e.preventDefault();
+  offsetX = dragOffX + (e.touches[0].clientX - dragStartX);
+  offsetY = dragOffY + (e.touches[0].clientY - dragStartY);
+  draw();
+}});
+canvas.addEventListener('touchend', () => {{ dragging = false; }});
+
+// zoom with wheel
+canvas.addEventListener('wheel', (e) => {{
+  e.preventDefault();
+  const rect = canvas.getBoundingClientRect();
+  const mx = e.clientX - rect.left;
+  const my = e.clientY - rect.top;
+  const cw = canvas.width, ch = canvas.height;
+  const ox = offsetX + (cw - PAGE_W * scale) / 2;
+  const oy = offsetY + (ch - PAGE_H * scale) / 2;
+  const px = (mx - ox) / scale;
+  const py = (my - oy) / scale;
+
+  const factor = e.deltaY < 0 ? 1.1 : 0.9;
+  const newScale = Math.min(4, Math.max(0.1, scale * factor));
+  scale = newScale;
+  offsetX = mx - px * scale - (cw - PAGE_W * scale) / 2;
+  offsetY = my - py * scale - (ch - PAGE_H * scale) / 2;
+  zoomSlider.value = Math.round(scale * 100);
+  draw();
+}});
+
+// zoom slider
+zoomSlider.addEventListener('input', () => {{
+  const newScale = parseInt(zoomSlider.value) / 100;
+  const cw = canvas.width, ch = canvas.height;
+  const cx = cw / 2, cy = ch / 2;
+  const ox = offsetX + (cw - PAGE_W * scale) / 2;
+  const oy = offsetY + (ch - PAGE_H * scale) / 2;
+  const px = (cx - ox) / scale;
+  const py = (cy - oy) / scale;
+  scale = newScale;
+  offsetX = cx - px * scale - (cw - PAGE_W * scale) / 2;
+  offsetY = cy - py * scale - (ch - PAGE_H * scale) / 2;
+  draw();
+}});
+
+document.getElementById('fit-btn').addEventListener('click', () => {{
+  const cw = canvas.width, ch = canvas.height;
+  const s = Math.min((cw - 80) / PAGE_W, (ch - 80) / PAGE_H);
+  scale = s;
+  offsetX = 0; offsetY = 0;
+  zoomSlider.value = Math.round(scale * 100);
+  draw();
+}});
+
+document.getElementById('reset-btn').addEventListener('click', () => {{
+  scale = 1; offsetX = 0; offsetY = 0;
+  zoomSlider.value = 100;
+  draw();
+}});
+
+function init() {{
+  resize();
+  fitBtn = document.getElementById('fit-btn');
+  fitBtn.click();
+}}
+
+window.addEventListener('resize', resize);
+</script>
+</body>
+</html>"#,
+        title = title,
+        width = width,
+        height = height,
+        data_uri_str = serde_json::to_string(data_uri).unwrap(),
+    );
+    html
+}

src/queue/job.rs

@@ -24,6 +24,10 @@ pub struct FaxJob {
     pub retries: u8,
     pub created_at: DateTime<Utc>,
     pub updated_at: DateTime<Utc>,
+    pub cover_to: Option<String>,
+    pub cover_from: Option<String>,
+    pub cover_subject: Option<String>,
+    pub cover_notes: Option<String>,
 }
 
 impl FaxJob {
@@ -38,6 +42,10 @@ impl FaxJob {
             retries: 0,
             created_at: now,
             updated_at: now,
+            cover_to: None,
+            cover_from: None,
+            cover_subject: None,
+            cover_notes: None,
         }
     }
 }

src/queue/store.rs

@@ -40,7 +40,11 @@ impl FaxQueue {
                 pages INTEGER DEFAULT 0,
                 retries INTEGER DEFAULT 0,
                 created_at TEXT NOT NULL,
-                updated_at TEXT NOT NULL
+                updated_at TEXT NOT NULL,
+                cover_to TEXT,
+                cover_from TEXT,
+                cover_subject TEXT,
+                cover_notes TEXT
             )",
             [],
         )?;
@@ -56,8 +60,8 @@ impl FaxQueue {
             #[cfg(feature = "server")]
             FaxQueue::Sqlite(s) => {
                 s.conn.execute(
-                    "INSERT INTO fax_jobs (id, recipient, document_path, status, pages, retries, created_at, updated_at)
+                    "INSERT INTO fax_jobs (id, recipient, document_path, status, pages, retries, created_at, updated_at, cover_to, cover_from, cover_subject, cover_notes)
-                     VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7, ?8)",
+                     VALUES (?1, ?2, ?3, ?4, ?5, ?6, ?7, ?8, ?9, ?10, ?11, ?12)",
                     rusqlite::params![
                         job.id.to_string(),
                         job.recipient,
@@ -67,6 +71,10 @@ impl FaxQueue {
                         job.retries,
                         job.created_at.to_rfc3339(),
                         job.updated_at.to_rfc3339(),
+                        job.cover_to,
+                        job.cover_from,
+                        job.cover_subject,
+                        job.cover_notes,
                     ],
                 )?;
                 Ok(())
@@ -106,6 +114,37 @@ impl FaxQueue {
         }
     }
 
+    pub fn update_cover(&mut self, id: &JobId, to: Option<String>, from: Option<String>, subject: Option<String>, notes: Option<String>) -> Result<bool> {
+        let now = chrono::Utc::now();
+        match self {
+            FaxQueue::InMemory(s) => {
+                if let Some(job) = s.jobs.get_mut(id) {
+                    if to.is_some() { job.cover_to = to; }
+                    if from.is_some() { job.cover_from = from; }
+                    if subject.is_some() { job.cover_subject = subject; }
+                    if notes.is_some() { job.cover_notes = notes; }
+                    job.updated_at = now;
+                    Ok(true)
+                } else {
+                    Ok(false)
+                }
+            }
+            #[cfg(feature = "server")]
+            FaxQueue::Sqlite(s) => {
+                let affected = s.conn.execute(
+                    "UPDATE fax_jobs SET cover_to = COALESCE(?1, cover_to),
+                                          cover_from = COALESCE(?2, cover_from),
+                                          cover_subject = COALESCE(?3, cover_subject),
+                                          cover_notes = COALESCE(?4, cover_notes),
+                                          updated_at = ?5
+                     WHERE id = ?6",
+                    rusqlite::params![to, from, subject, notes, now.to_rfc3339(), id.to_string()],
+                )?;
+                Ok(affected > 0)
+            }
+        }
+    }
+
     pub fn pending_jobs(&self) -> Vec<FaxJob> {
         match self {
             FaxQueue::InMemory(s) => s

test/class1_receive.py

@@ -0,0 +1,177 @@
+#!/usr/bin/env python3
+"""Class 1 Fax Receiver - for testing with USR sender"""
+import termios
+import os
+import time
+import sys
+
+def main():
+    if len(sys.argv) < 2:
+        print("Usage: class1_receive.py <device>")
+        sys.exit(1)
+    
+    device = sys.argv[1]
+    fd = os.open(device, os.O_RDWR | os.O_NOCTTY | os.O_NONBLOCK)
+    
+    attrs = termios.tcgetattr(fd)
+    attrs[4] = termios.B115200
+    attrs[5] = termios.B115200
+    attrs[2] |= termios.CLOCAL | termios.CREAD
+    attrs[3] &= ~termios.ICANON
+    attrs[3] &= ~termios.ECHO
+    attrs[3] &= ~termios.ECHOE
+    attrs[3] &= ~termios.ISIG
+    termios.tcsetattr(fd, termios.TCSANOW, attrs)
+    termios.tcflush(fd, termios.TCIOFLUSH)
+    
+    def drain():
+        try:
+            while True:
+                os.read(fd, 4096)
+        except BlockingIOError:
+            pass
+    
+    def send_cmd(cmd, wait=0.5):
+        drain()
+        os.write(fd, cmd.encode() + b"\r")
+        time.sleep(wait)
+        result = b""
+        try:
+            while True:
+                data = os.read(fd, 4096)
+                result += data
+        except BlockingIOError:
+            pass
+        return result.decode(errors="replace")
+    
+    def wait_for(pattern, timeout=30):
+        start = time.time()
+        result = b""
+        while time.time() - start < timeout:
+            try:
+                data = os.read(fd, 4096)
+                result += data
+                decoded = result.decode(errors="replace")
+                for p in pattern if isinstance(pattern, list) else [pattern]:
+                    if p in decoded:
+                        return decoded
+            except BlockingIOError:
+                time.sleep(0.1)
+        return result.decode(errors="replace")
+    
+    print("[RECV] Initializing Class 1...")
+    send_cmd("AT", 0.3)
+    send_cmd("AT+FCLASS=1", 0.3)
+    
+    print("[RECV] Waiting for rings...")
+    
+    ring_count = 0
+    while ring_count < 2:
+        try:
+            data = os.read(fd, 4096)
+            text = data.decode(errors="replace")
+            if "RING" in text:
+                ring_count += text.count("RING")
+                print(f"[RECV] Ring {ring_count}")
+        except BlockingIOError:
+            time.sleep(0.3)
+    
+    print("[RECV] Answering...")
+    answer_result = send_cmd("ATA", 3)
+    print(f"[RECV] ATA result: {answer_result.strip()}")
+    
+    if "CONNECT" not in answer_result:
+        drain()
+        os.write(fd, b"ATA\r")
+        wait_result = wait_for("CONNECT", 10)
+        print(f"[RECV] Wait result: {wait_result.strip()}")
+    
+    print("[RECV] Connected! Sending CED tone...")
+    time.sleep(0.5)
+    
+    # Send CED tone (2100Hz for 2.6-4 seconds)
+    ced_result = send_cmd("AT+FTS=8", 4)  # FTS=8 sends 2100Hz
+    print(f"[RECV] CED result: {ced_result.strip()}")
+    
+    # Wait 75ms then send DIS
+    time.sleep(0.1)
+    
+    print("[RECV] Sending DIS frame...")
+    
+    # Start HDLC transmit
+    os.write(fd, b"AT+FTH=3\r")
+    fth_result = wait_for("CONNECT", 5)
+    print(f"[RECV] FTH=3: {fth_result.strip()}")
+    
+    if "CONNECT" in fth_result:
+        # DIS frame: preamble+flags+DCS+data+RTC
+        # Address: 0xFF (broadcast), Control: 0x80 (DIS from called)
+        # DIS data: minimum capabilities
+        dis_data = bytes([
+            0xFF, 0x13, 0x80,  # Address + Control (DIS from called)
+            0x00, 0x50, 0x1F,  # DIS parameters
+        ])
+        # Add FCS (we'll let modem calculate)
+        os.write(fd, dis_data)
+        os.write(fd, b"\x00\x00\x00")  # Padding
+        time.sleep(0.5)
+        
+        # Wait for OK
+        dis_ok = wait_for("OK", 5)
+        print(f"[RECV] DIS sent: {dis_ok.strip()}")
+    
+    print("[RECV] Waiting for DCS...")
+    drain()
+    os.write(fd, b"AT+FRH=3\r")
+    dcs_result = wait_for("OK", 10)
+    print(f"[RECV] DCS received: {len(dcs_result)} bytes")
+    
+    print("[RECV] Waiting for TCF...")
+    drain()
+    os.write(fd, b"AT+FRM=96\r")  # Receive at 14400 bps
+    tcf_result = wait_for("CONNECT", 5)
+    print(f"[RECV] TCF: {tcf_result.strip()}")
+    
+    # Send CFR
+    print("[RECV] Sending CFR...")
+    drain()
+    os.write(fd, b"AT+FTH=3\r")
+    wait_for("CONNECT", 5)
+    cfr_data = bytes([0xFF, 0x13, 0x21])  # CFR frame
+    os.write(fd, cfr_data)
+    os.write(fd, b"\x00\x00\x00")
+    time.sleep(0.5)
+    wait_for("OK", 5)
+    print("[RECV] CFR sent")
+    
+    print("[RECV] Waiting for page data...")
+    # Receive page
+    drain()
+    os.write(fd, b"AT+FRM=96\r")
+    page_result = wait_for("OK", 60)
+    print(f"[RECV] Page received!")
+    
+    # Send MCF
+    print("[RECV] Sending MCF...")
+    drain()
+    os.write(fd, b"AT+FTH=3\r")
+    wait_for("CONNECT", 5)
+    mcf_data = bytes([0xFF, 0x13, 0x31])  # MCF frame
+    os.write(fd, mcf_data)
+    os.write(fd, b"\x00\x00\x00")
+    time.sleep(0.5)
+    wait_for("OK", 5)
+    print("[RECV] MCF sent")
+    
+    # Wait for DCN or hangup
+    print("[RECV] Waiting for DCN...")
+    drain()
+    os.write(fd, b"AT+FRH=3\r")
+    dcn_result = wait_for("OK", 10)
+    print(f"[RECV] Session ended: {dcn_result[:50]}")
+    
+    os.close(fd)
+    print("[RECV] Done!")
+
+if __name__ == "__main__":
+    main()