Name | Used for | Specified by |
|---|---|---|
| SIP | signaling | RFC 3261 |
| HTTP Digest auth. | authentication of SIP clients | RFC 2617 |
| SIP over TCP | SIP over connected sockets | RFC 5626 |
| SIP rport | SIP symmetric response routing | RFC 3581 |
| Session timers | SIP session timers | RFC 4028 |
| TLS v1.0 | encrypting transport layer of signaling | RFC 2246 |
| SDP | describing properties of the audio stream | RFC 4566 |
| SDP offer/answer | offer/answer model with SDP | RFC 3264 |
| RTP | packing audio data | RFC 3550 |
| SRTP | encrypting audio packets | RFC 3711 |
| SDES | cryptographic key exchange over SDP | RFC 4568 |
| AMR | audio codec | 3GPP S26 |
| AMR over RTP | sending AMR packets over RTP payload | RFC 4867 |
| HTTP | licensing and provisioning | RFC 2616 |
| HTTPS | HTTP over encrypted TLS channel | RFC 2818 |
| AES-256 in SRTP | Use of AES-192 and AES-256 in SRTP | RFC 6188 |
| ZRTP | Key agreement protocol | RFC 6189 |
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