Media security is obtained using Secure RTP (SRTP) and Secure RTCP (SRTCP). SRTP encrypts the media content based on a secure key and SRTCP provides statistics and control operations.
There is no user-specific action to use SRTP. Device Adapter and intervening servers negotiate a media stream that conforms to the RTP and SRTP requests in the SDP of the INVITE.
If the SDP in the INVITE is RTP only, then the call either completes as RTP end-to-end or the call fails.
If the SDP in the INVITE is SRTP only, then the call either completes as SRTP end-to-end or the call fails.
If the SDP has both SRTP and RTP, the call attempts to complete as SRTP, but falls back to RTP if necessary.
