Configuring CM IP codec set

Last Updated : Dec 08, 2021 |
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Device Adapter supports SRTP only with the AES_CM_128_HMAC_SHA1_80 cipher suite. This is one of the five media encryption options that are currently available on Communication Manager. For SRTP to work properly for Device Adapter, set '1-srtp-aescm128-hmac80' as the first choice in Communication Manager IP Codec Set Media Encryption list, and 'enforce-enc-srtcp' as the Encrypted SRTCP option.
Note:
If you set a crypto suite other than 1-srtp-aescm128-hmac80 as the preferred choice in IP Codec Set Media Encryption list, it may result in unexpected call drops on certain scenarios when Device Adapter endpoints are involved.
  1. Set first element in the Media Encryption section to 1-srtp-aescm128-hmac80
  2. Set Encrypted SRTCP to enforce-enc-srtcp
    ADDITIONAL INFORMATION:
    Note:
    Device Adapter supports SRTCP with SRTP, and RTCP with RTP. A combination of either SRTP and RTCP or RTP and SRTCP is not supported.
    For example, if SRTCP is used with RTP, calls still go through, but RTCP reports do not work.