On gateway restart, persisted non-terminal calls are now verified with
the provider (Twilio/Plivo/Telnyx) before being restored to memory.
This prevents phantom calls from blocking the concurrent call limit.
- Add getCallStatus() to VoiceCallProvider interface
- Implement for all providers with SSRF-guarded fetch
- Transient errors (5xx, network) keep the call with timer fallback
- 404/known-terminal statuses drop the call
- Restart max-duration timers for restored answered calls
- Skip calls older than maxDurationSeconds or without providerCallId
Pre-generates TTS audio for the configured inboundGreeting at startup
and serves it instantly when an inbound call connects, eliminating the
500ms+ TTS synthesis delay on the first ring.
Changes:
- twilio.ts: Add cachedGreetingAudio storage with getter/setter
- runtime.ts: Pre-synthesize greeting TTS after provider initialization
- webhook.ts: Play cached audio directly via media stream on inbound
connect, falling back to the original TTS path for outbound calls
or when no cached audio is available
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Twilio strips query parameters from WebSocket URLs in <Stream> TwiML,
so the auth token set via ?token=xxx never arrives on the WebSocket
connection. This causes stream rejection when token validation is enabled.
Fix: pass the token as a <Parameter> element inside <Stream>, which
Twilio delivers in the start message's customParameters field. The
media stream handler now extracts the token from customParameters,
falling back to query string for backwards compatibility.
Co-authored-by: McWiggles <mcwigglesmcgee@users.noreply.github.com>
* fix(voice-call): prevent audio overlap with TTS queue
Add a TTS queue to serialize audio playback and prevent overlapping
speech during voice calls. Previously, concurrent speak() calls could
send audio chunks simultaneously, causing garbled/choppy output.
Changes:
- Add queueTts() to MediaStreamHandler for sequential TTS playback
- Wrap playTtsViaStream() audio sending in the queue
- Clear queue on barge-in (when user starts speaking)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
* fix(voice-call): use iterative queue processing to prevent heap exhaustion
The recursive processQueue() pattern accumulated stack frames, causing
JavaScript heap out of memory errors on macOS CI. Convert to while loop
for constant stack usage regardless of queue depth.
* fix: prevent voice-call TTS overlap (#1713) (thanks @dguido)
---------
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Co-authored-by: Peter Steinberger <steipete@gmail.com>
- Switch from inline to URL-based TwiML for outbound calls
- Store TwiML content temporarily and serve on webhook request
- Add twimlStorage map and cleanup helper methods
- Fix TwiML serving to handle CallStatus='in-progress' on initial request
Closes#864
