VoIP protocol comparison

No single protocol does everything in a VoIP call.

| Protocol | Job | |—|—| | SIP | Session signalling | | SDP | Media negotiation | | RTP | Audio and video transport | | RTCP | Media reports and synchronisation | | SRTP | Protected media | | TLS | Protected signalling transport | | STUN | Public address discovery | | TURN | Media relay | | ICE | Candidate path selection |

Use the VoIP protocols guide when separating signalling failures from media failures.