Feature: Auto-transcription hook with per-channel caller/callee labels

[davidcforbes]

Description

Automatically trigger transcription when a call recording completes, with speaker identification based on stereo channel mapping.

Implementation

A TranscriptHook that implements CallRecordHook:

• Triggers configured ASR command when recording finishes
• Writes structured transcript JSON with timestamps and text
• Adds role ("caller"/"callee") and label (extension/phone number) per segment
• Derives speaker identity from stereo WAV channel mapping (ch0 = Leg A = caller, ch1 = Leg B = callee)
• Updates call record database with transcript path

Config

[proxy.transcript]
command = "/usr/local/bin/sensevoice-cli"
models_path = "/models"
timeout_secs = 120

Files

• src/addons/transcript/hook.rs — new TranscriptHook module
• src/addons/transcript/models.rs — ChannelParticipant, role/label fields
• src/addons/transcript/handlers.rs — channel-to-participant mapping
• src/config.rs — TranscriptToolConfig struct

Reference: davidcforbes/rustpbx@50d68ca