Opportunistic DTLS-SRTP session Establishment Sample Clauses

Opportunistic DTLS-SRTP session Establishment.  A secure TIP device MUST start two DTLS-SRTP [19] sessions [a TIP device MUST act as a DTLS client for one of the DTLS-SRTP sessions while acting as a DTLS server for the other] for each negotiated media line irrespective of whether the AVP or the SAVP profiles were negotiated during call setup. .  The reception of an RTCP APP packet with subtype 1 on an RTP or SRTP session prior to the reception of a valid DTLS-SRTP communication over the same session MUST result in the termination of all DTLS-SRTP sessions associated with the (S)RTP session. Following the DTLS-SRTP termination, TIP negotiation MUST start using RTP/AVP or RTP/SAVP based on what was negotiated during call setup.  Once BOTH of the DTLS-SRTP sessions associated with an (S)RTP session has succeeded, the TIP device MUST consider the session to be an SRTP session and MUST:  Derive the SRTP and SRTCP master keys used for the encryption and authentication of all transmitted SRTP and SRTCP packets using the write key associated with the DTLS-SRTP client session.  Use the crypto algorithm negotiated in the client session for SRTP and SRTCP packet authentication and encryption  Derive the SRTP and SRTCP master keys used for the authentication and decryption of all received SRTP and SRTCP packets using the read key associated with the DTLS-SRTP server session.  Use the crypto algorithm negotiated in the server session for SRTP and SRTCP packet authentication and decryption  Start Secure TIP negotiation.  If one or both of the DTLS-SRTP sessions associated with an (S)RTP session fails, the TIP device MUST start its TIP negotiation and operate in an RTP/AVP or RTP/SAVP mode based on what was negotiated during call setup.
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