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AUTH1 bgoswami REV5 ksaurabh REV6 kvenkatraman REV3 tjena REV1

 

The Secure Real-time Transport Protocol (Secure RTP or SRTP) is an IETF cryptographic protocol used to provide secure communications over untrusted networks as described in RFC 3711. SRTP provides confidentiality, message authentication and replay protection to Internet media traffic such as audio and video. The 

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supports Secure RTP and its associated secure real-time transport control protocol (Secure RTCP) for IPv4/IPv6 addressing for both audio and video streams.

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Secure RTP on the SBC is available using SIP signaling over UDP, TCP, and TLS (Transport Layer Security) protocol, and is signaled by specifying Secure RTP transport in an SDP (Session Description Protocol) media (m=) line. The

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uses the RFC 4568 Security Descriptions ("sdescriptions") standard for negotiating the use of Secure RTP. TLS over TCP is recommended for SIP transport when negotiating Secure RTP, because it protects the integrity and confidentiality of the sRTP keys which would otherwise be exposed. The 

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supports sRTP on all call legs.

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The 

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supports the crypto-suite "aes-cm-128-hmac-sha1-80" and "aes-cm-128-hmac-sha1-32" for Secure RTP. Secure RTP is requested by the presence of RTP/SAVP or RTP/SAVPF in the m= line.

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The appropriate crypto suite profile may also include valid combinations of the following session parameters:

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