Administering SRTP for video signaling

Last Updated : Sep 29, 2026 |
Prolog information
Metadata
Keywords:
  1. Type change system-parameters customer-options.
    ADDITIONAL INFORMATION:
    The system displays the Optional Features screen.
  2. On page 4 of the Optional Features screen, set the Media Encryption Over IP field to y.
    ADDITIONAL INFORMATION:
    This setting applies both audio and video SRTP.
  3. Type change system-parameters features.
    ADDITIONAL INFORMATION:
    The system displays the Feature-Related System Parameters screen.
  4. On page 19 of the Feature-related System Parameters screen, set the Initial INVITE with SDP for secure calls field to y.
  5. Type change signaling–group n, where n is the signaling group number.
    ADDITIONAL INFORMATION:
    The system displays the Signaling Group screen.
  6. Set the Enforce SIPS URI for SRTP field to y.
  7. Type change system-parameters ip-options.
    ADDITIONAL INFORMATION:
    The system displays the IP-Options Systems Parameters screen.
  8. On page 2 of the IP-Options Systems Parameters screen, set the Override ip-codec-set for SIP direct-media connections field to:
    • n if you are running Communication Manager 6.3.2 or later.
    • y if you are running an earlier release of Communication Manager.
  9. Type any of the following:
    • change ip-codec-set n
    • change ip-media-parameters n
    ADDITIONAL INFORMATION:
    Where n is the ip codec set number.
    STEP RESULT:
    The system displays the IP Media Parameters screen.
  10. In the Media Encryption section, administer the SRTP options.
    1. In field 1, type 10-srtp-aescm256-hmac80.
    2. In field 2, type 11-srtp-aescm256-hmac32.
    3. In field 3, type 1-srtp-aescm128-hmac80.
    4. In field 4, type 2-srtp-aescm128-hmac32.
    5. In field 5, type none.
    ADDITIONAL INFORMATION:
    Note:
    For video calls to work on the Best Effort SRTP mode, select none.
  11. Repeat Step 6 for each ip codec set.
Related links
SRTP media encryption