Wires Meta's WhatsApp Cloud Calling APIs into the voice subsystem so
agents can answer / place calls on WhatsApp Cloud inboxes from the
existing Voice flow. Browser ↔ Meta WebRTC is direct (no media-server
hop); Chatwoot owns the signalling, recording upload, and lifecycle
state on the Call/Message records.
Backend
- API surface: new Api::V1::Accounts::WhatsappCallsController with
show / accept / reject / terminate / initiate / upload_recording.
Enforces conversation-level Pundit visibility, blocks initiate when
the channel isn't embedded-signup voice-enabled, and surfaces the
Meta 138006 (no-call-permission) flow as a throttled opt-in template
send under a conversation lock so concurrent retries can't double-send.
- Whatsapp::CallService — accept/reject/terminate state machine with
call-level locking; wraps Meta API failures (transport or business)
as Voice::CallErrors::CallFailed so the controller renders 422.
- Whatsapp::IncomingCallService — handles Meta connect/terminate
webhooks; pins setup:active on outbound answers, materialises a
missed-call record when terminate arrives before connect, and
broadcasts voice_call.* events to assignee or account streams.
- Whatsapp::Providers::WhatsappCloudService — adds pre_accept/accept/
reject/terminate/initiate/permission-request endpoints. Uses
configurable WHATSAPP_API_VERSION (default v22) since the Calls API
needs v17+ and OSS phone_id_path is locked at v13.
- Audio recordings: Attachment after_create_commit enqueues
transcription and rebroadcasts the message so the FE bubble updates
immediately. Active Storage initializer allows audio MIME types to
serve inline. Audio transcription drops Whisper temperature to 0 to
suppress hallucinations on silence.
- Channel::Voice stub backs legacy inbox rows whose channel_type
survived the DropChannelVoice migration so jbuilder .try chains
short-circuit instead of raising.
Routes / config
- /api/v1/accounts/:id/whatsapp_calls/* (enterprise-only)
- en.yml error strings under errors.whatsapp.calls.*
The FE consumer of this API ships separately on feat/whatsapp-call-ui.
Tanmay Deep Sharma
d693d468d8