Resources
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.