How to Integrate Twilio

This integration enables a voice AI agent to initiate and receive phone calls via Twilio, using Twilio’s built-in voice and speech models.

Unlike SIP integration, which requires separately connecting speech input/output models, Twilio provides built-in speech-to-text (STT) and text-to-speech (TTS) capabilities. This significantly reduces external configuration and simplifies the setup process.

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Setting Up: Connect Twilio

1. Go to Settings > Channels

2. Select Twilio

3. Select Add +

4. Enter the following information:

   Field	Description	Required
   Name	Display name for this Twilio connector	✅
   Description	Optional notes about this connector	❌
   Account SID	Unique identifier for your Twilio account	✅
   Auth Token	Twilio secret key for API authentication	✅
   Phone number	Twilio phone number used as the caller ID for outbound calls and as the receiving number for inbound calls (E.164 format, for example, +14155550123)	✅
   Voice model	Voice used for speech synthesis (Twilio TTS voice, for example, Polly.Salli)	❌
   Speech model	Speech recognition model used by Twilio STT (for example, googlev2_telephony)	❌
   Region	Twilio region code that defines where API and media servers are hosted (for example, us1, ie1, au1, de1, sg1)	❌
   Edge	Twilio edge location — the geographic entry and exit points closest to your infrastructure, used to reduce call latency (for example, dublin, ashburn, tokyo)	❌

   info

   Both Region and Edge are optional. If left empty, Twilio uses the default infrastructure (us1 / ashburn)

5. Click Save to add the communication channel

Integration Highlights

• Built-in STT/TTS: Twilio handles speech recognition and generation internally, so no additional STT/TTS integration is required on the Flametree side.
• Supports both inbound and outbound calls: The AI agent can initiate calls to customers and receive incoming calls via the connected number.
• Exclusive to Twilio: This integration type does not support third-party VoIP or SIP servers.