# SIP trunking

URL: https://www.getdynamiq.ai/glossary/sip-trunking

> A connection between a phone network and a voice application over the internet using the Session Initiation Protocol, not analog lines.

A connection between a phone network and a voice application over the internet using the Session Initiation Protocol, not analog lines.

SIP trunking carries phone calls over the internet using the Session Initiation Protocol, connecting a phone number at a carrier to an application, here, a voice agent, instead of a physical phone line. The carrier relationship, the phone numbers and the rates all stay exactly what they already were; only where the call is answered changes.

A regulated contact center's phone line is often the one channel its customers actually use, and connecting a voice agent has to work with the numbers and carriers the institution already has, not force a number migration or a new carrier relationship just to add an agent.

A contact center points its existing carrier trunk's origination at a voice agent, and customers keep calling the exact same numbers they always have, with no number to relearn.

**In Dynamiq**, phone numbers are not sold by Dynamiq. Connect numbers you already own at a SIP provider by pointing that provider's trunk origination at the SIP URI a deployed voice agent provides, with optional digest authentication for providers that require it. Voice agents answer inbound calls; they do not place outbound calls.

## See it in Dynamiq

-   [Voice Agents](https://www.getdynamiq.ai/product/voice-agents)
-   [Contact center voice agents](https://www.getdynamiq.ai/use-cases/contact-center)

## Related terms

-   [Voice agent](https://www.getdynamiq.ai/glossary/voice-agent)
-   [WebRTC](https://www.getdynamiq.ai/glossary/webrtc)
-   [Barge-in and turn detection](https://www.getdynamiq.ai/glossary/barge-in-and-turn-detection)

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