How to Set Up SIP

The AI agent can also make and receive phone calls. SIP integration allows you to connect external telephony infrastructure, such as corporate Asterisk/PBX systems, VoIP providers, or public SIP servers (including Twilio).

Through SIP, your AI agent can act as a virtual voice endpoint—initiating, answering, transferring, or managing calls using standard telephony protocols while maintaining real-time interaction with the caller.

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What is SIP

SIP (Session Initiation Protocol) is a communication protocol used to establish, manage, and terminate voice calls over the internet. Within the Flametree platform, SIP integration is used to:

• Initiate outbound calls to customers
• Receive inbound calls from clients
• Conduct full voice conversations with AI agent participation

Prerequisites

To connect SIP integration, you will need:

• Your SIP provider details:
  • SIP domain (for example, sip.example.com)
  • SIP account login and password
• Voice models:
  • Speech-to-Text (STT) — for transcribing customer speech
  • Text-to-Speech (TTS) — for generating spoken responses from the AI agent

Unlike Twilio, SIP does not provide built-in voice models, so they must be connected separately.

Setting Up: Add SIP Integration in the Platform

1. Go to Settings > Channels

2. Select SIP

3. Select Add +

4. Enter the following information:

   Field	Description	Required
   Name	Display name for this SIP connector	✅
   Description	Optional notes about this connector	❌
   Domain	SIP domain (for example, sip.twilio.com)	✅
   User	SIP username (account login)	✅
   Password	SIP password (for authentication)	✅
   Login	SIP login (if different from username; optional)	❌
   Caller ID	SIP caller phone number (used as outbound caller ID; optional)	❌

5. Click Save to add the communication channel

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Next Steps

Once your SIP integration is created, proceed to the next step — create your Voice Agent.