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| Note |
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The "aes-cm-128-hmac-sha1-32" algorithm is not supported in . |
The appropriate crypto suite profile may also include valid combinations of the following session parameters:
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- Direct Media over SRTP/TLS between subscribers in the same Media Group for both audio and video calls.
- Direct Media between endpoints in the same media zone belonging to the same or different . For example, Direct Media with TLS/SRTP is applicable for a distributed network containing two s.
Media Pass-through
In prior releases,
terminates all SRTP and SRTCP media for authentication, encryption, and decryption based on the Packet Service Profile (PSP) Secure RTP/RTCP configuration. It negotiates the required cryptographic security description with peers by terminating the signaling session. It uses locally generated keys and other security descriptors for media encryption and decryption by conveying them to peers in signaling Session Description Protocol (SDP). is enhanced to support SRTP media pass-through for SRTP and SRTCP media streams. does not terminate the SDP security description or SRTP media streams and passes them through without authenticating, decrypting, and encrypting. In this pass-through mode of operation, treats SRTP media as plain text RTP pass-through media.The following diagram illustrates the media flow for an SRTP pass-through call.
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| 0 | Figure |
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| 1 | SRTP Packet to Packet Media Call Flow |
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 Image Added
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| Note |
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- Secure RTP and Secure RTCP pass-through flows are supported for end-to-end security-associated peers.
- This feature does not support media transcoding, DTMF interworking, and Lawful Intercept (LI).
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