> ## Documentation Index
> Fetch the complete documentation index at: https://docs.vasl.sh/llms.txt
> Use this file to discover all available pages before exploring further.

# SIP

> Room systems and phones join with audio and video.

Use SIP when the room system or the phone already places a call, and you want that call on the same server as the cameras and the browsers.

SIP ingest carries audio and video. The stream then follows the same process and deliver path as any other ingest. Play it back over [WebRTC](/play/webrtc) for people in the session, [HLS](/play/hls) for a watch-only audience, or [RTSP](/play/rtsp) for a recorder that expects it.

Protect the dial-in the same way you protect any other publish: a key that expires, and TLS on the path you expose. See [Security](/security).


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