h1. SIP protocol

{{>toc}}

h2. Supported protocols

* SIP v2
* SIP over UDP
* SIP over TCP
* SIP over TLS
* SRTP
* T.38
* SIP INFO DTMF (RFC 2976)
* RFC 3261 (ACK, BYE, CANCEL, INVITE, OPTIONS, REGISTER)
* RFC 3265 (SUBSCRIBE, NOTIFY)
* RFC 3311 (UPDATE)
* RFC 3515 (REFER)
* RE-INVITE support

h2. Additionally

* registration: inbound and outbound.
  Configurable timeouts and number of attempts;
* support for devices under NAT;
* support for system deployment under NAT;
* calls hangup by RTP timeout;
* RTP bridging modes: direct (aka DirectRTP or OpenRTP) , proxy, translation, passing through jitter buffer (when bridged with physical channels);
* video support;
* manipulation of ToS of frames

[[Протокол SIP|Русский перевод]]