Skip to main content
SIP trunks connect your provider-managed phone numbers or PBX to Callgency. You supply the SIP provider configuration and add the phone numbers that use the trunk.
SIP requires the SIP Engine feature to be enabled, SIP access on your plan, and permission to use the selected engine. Access is configured per plan; a plan name alone does not establish eligibility. Ask your administrator or support if the page offers an upgrade or shows no available engines.

​
Choosing an Engine

Only engines allowed for your account appear in the selector. Realtime AI via SIP also requires administrator configuration. It does not support outbound calling; do not treat it as interchangeable with Premium AI via SIP. Model availability is controlled separately from the SIP engine.

​
Adding a SIP Trunk

  1. Go to Deploy > SIP Trunks and open My Trunks.
  2. Click Add SIP Trunk.
  3. Enter a name and select an available engine and SIP provider. Use Generic SIP for an appropriate custom endpoint.
  4. Enter the provider’s SIP host, port, transport, and required authentication credentials. Review inbound settings separately when your provider uses different inbound and outbound transports or ports.
  5. Save the trunk, then use the origination instructions displayed in the page to configure inbound routing with your provider.
  6. Open Phone Numbers within SIP Trunks and add the numbers that belong to the trunk. Configure supported call directions and assign a compatible agent where needed.
Adding a trunk does not automatically import every provider number or complete provider-side routing. Check the number’s registration and routing status before using it.

​
Managing SIP Numbers

The SIP phone-number list shows the engine and supported call directions. Use the available assignment, edit, sync, or re-provision actions to maintain the configuration. Use Premium AI via SIP for supported outbound SIP workflows. Realtime AI via SIP numbers cannot be used for outbound calling. SIP numbers and rented Twilio numbers have separate configuration paths; see Connections for supported inbound setup and Phone Numbers for current rentals. Existing Plivo telephony records do not add a current AI Agents provider option.