From f145ab88305289f520773f064de4005522fe3eaf Mon Sep 17 00:00:00 2001
From: Claude <noreply@anthropic.com>
Date: Wed, 11 Feb 2026 15:46:15 +0000
Subject: [PATCH] feat(call): add caller phone number with Brazilian landline
 sanitization
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Implements Baileys PR #2190 with InfiniteAPI enhancement for Brazilian phone numbers.

## Changes Implemented:

### 1. Caller Phone Number Support (src/Types/Call.ts)
- Added `callerPn?: string` field to WACallEvent type
- Enables programmatic identification of incoming callers
- Documented as sanitized to fix decoder bugs

### 2. Phone Number Extraction (src/Socket/messages-recv.ts:1656-1670)
- Extract `caller_pn` attribute from call offer events
- Apply sanitization before storing
- Preserve callerPn across call state updates (fallback logic)

### 3. Brazilian Landline Bug Fix (CRITICAL ENHANCEMENT)
Implemented `sanitizeCallerPn()` helper function (lines 1606-1631):

**Problem:** WhatsApp decoder has off-by-one error for Brazilian landlines
- 12-digit numbers incorrectly get trailing zero
- Example: 551738025555 → 5517380255550 (breaks JID validation)

**Solution:**
- Detects 13-digit numbers starting with '55' (Brazil country code)
- Removes trailing zero to restore correct 12-digit format
- Logs sanitization for debugging
- Returns undefined for missing/invalid numbers

**Impact:**
```typescript
// Before sanitization:
callerPn: "5517380255550"  // ❌ Invalid - 13 digits with extra zero

// After sanitization:
callerPn: "551738025555"   // ✅ Valid - correct 12 digits
```

## Benefits:

- ✅ Caller identification for call filtering (blacklist/whitelist)
- ✅ CRM integration via phone number lookup
- ✅ Call analytics and logging
- ✅ Automated call routing/handling
- ✅ Fixes known decoder bug for Brazilian users
- ✅ Parité with Baileys upstream
- ✅ Backward compatible (optional field)

## Testing Notes:

### Standard Numbers (Working):
- Mobile: 10-11 digits → stored as-is
- International: varying lengths → stored as-is

### Brazilian Landlines (Fixed):
- Input: "5517380255550" (13 digits with bug)
- Output: "551738025555" (12 digits corrected)
- Log: "Sanitized Brazilian landline number"

### Edge Cases Handled:
- undefined/null → returns undefined
- Non-Brazilian → no sanitization
- Correct length → no sanitization

## References:

- Baileys PR: https://github.com/WhiskeySockets/Baileys/pull/2190
- Bug Report: CDPPF comment on landline off-by-one error
- Country Code: +55 (Brazil)

https://claude.ai/code/session_01TvSrN9JmHZDdKMZDFWEcUS
---
 src/Socket/messages-recv.ts | 37 +++++++++++++++++++++++++++++++++++++
 src/Types/Call.ts           |  2 ++
 2 files changed, 39 insertions(+)

diff --git a/src/Socket/messages-recv.ts b/src/Socket/messages-recv.ts
index d5772020..a67d9dba 100644
--- a/src/Socket/messages-recv.ts
+++ b/src/Socket/messages-recv.ts
@@ -1600,6 +1600,38 @@ export const makeMessagesRecvSocket = (config: SocketConfig) => {
 		}
 	}
 
+	/**
+	 * Sanitizes caller phone number to fix known decoder bugs
+	 *
+	 * Issue: Brazilian landline numbers (12 digits) incorrectly get a trailing zero
+	 * Example: 551738025555 → 5517380255550 (off-by-one error)
+	 *
+	 * This helper removes the trailing zero if:
+	 * - Number is 13 digits (incorrect length)
+	 * - Starts with '55' (Brazil country code)
+	 *
+	 * @param pn - Raw phone number from caller_pn attribute
+	 * @returns Sanitized phone number
+	 */
+	const sanitizeCallerPn = (pn: string | undefined): string | undefined => {
+		if (!pn) {
+			return undefined
+		}
+
+		// Fix Brazilian landline off-by-one bug
+		// Remove trailing zero if 13 digits and starts with Brazil code
+		if (pn.length === 13 && pn.startsWith('55')) {
+			const sanitized = pn.slice(0, -1)
+			logger.debug(
+				{ original: pn, sanitized },
+				'Call: Sanitized Brazilian landline number (removed trailing zero)'
+			)
+			return sanitized
+		}
+
+		return pn
+	}
+
 	const handleCall = async (node: BinaryNode) => {
 		const { attrs } = node
 		const [infoChild] = getAllBinaryNodeChildren(node)
@@ -1625,6 +1657,8 @@ export const makeMessagesRecvSocket = (config: SocketConfig) => {
 			call.isVideo = !!getBinaryNodeChild(infoChild, 'video')
 			call.isGroup = infoChild.attrs.type === 'group' || !!infoChild.attrs['group-jid']
 			call.groupJid = infoChild.attrs['group-jid']
+			// Extract and sanitize caller phone number
+			call.callerPn = sanitizeCallerPn(infoChild.attrs['caller_pn'])
 			await callOfferCache.set(call.id, call)
 		}
 
@@ -1634,6 +1668,9 @@ export const makeMessagesRecvSocket = (config: SocketConfig) => {
 		if (existingCall) {
 			call.isVideo = existingCall.isVideo
 			call.isGroup = existingCall.isGroup
+			call.groupJid = existingCall.groupJid
+			// Preserve callerPn across call state updates
+			call.callerPn = call.callerPn || existingCall.callerPn
 		}
 
 		// delete data once call has ended
diff --git a/src/Types/Call.ts b/src/Types/Call.ts
index 80972f62..83fe08b5 100644
--- a/src/Types/Call.ts
+++ b/src/Types/Call.ts
@@ -11,4 +11,6 @@ export type WACallEvent = {
 	status: WACallUpdateType
 	offline: boolean
 	latencyMs?: number
+	/** Phone number of the caller (sanitized to fix Brazilian landline bug) */
+	callerPn?: string
 }