Skip to end of metadata
Go to start of metadata

In this section:

 

Optimum Video Quality

The following SBC Core video configuration best practices are intended to ensure optimum video quality.

  1. Enable RTCP relay on both legs to ensure video RTCP feedback messages are relayed..

    Example
    % set profiles media packetServiceProfile IN_PSP rtcpOptions rtcp enable terminationForPassthrough disable 



  2. Enable SIP INFO relay and transparency depending upon the SBC release version.

    1. Prior to 4.2.3R0 release: Enable SIP INFO relay and transparency for unknown bodies to allow relay of the FAST UPDATE SIP INFO

      Example
      % set profiles signaling ipSignalingProfile DEFAULT_SIP commonIpAttributes relayFlags info enable
      % set profiles signaling ipSignalingProfile DEFAULT_SIP commonIpAttributes transparencyFlags unknownBody enable



    2. Effective 4.2.3R0 release and onwards: Enable SIP INFO relay and transparency for media_control+xml body to allow relay of the FAST UPDATE SIP INFO.

      Example
      % set profiles services transparencyProfile mediaControl sipMessageBody application/media_control+xml 
      % set profiles services transparencyProfile mediaControl state enabled 
      % set addressContext default zone <egress Zone> sipTrunkGroup <egress TG> services transparencyProfile mediaControl



  3. If the SBC receives fragmented media packets (audio, video, FECC, and BFCP) beyond MTU size, it will increment an error counter in SYS log. An example SYS log entry is shown below.

    Example
    140 10152012 190702.985943:1.01.00.31881.MAJOR   .PRSNP: *NP 0 error 
    counter rcvPkt2Big          incremented: cnt 8749 last error 0x101203f


    To rectify this, adjustments must be made at the endpoints.

Late Media Support

The “convert” mode for lateMediaSupport only applies to Audio; for multimedia sessions, enable “passthru” mode.

CLI syntax to enable pass-through (see sipTrunkGroup media (CLI) for configuration details):

set addressContext (addressContex name) zone (zone name) sipTrunkGroup (sipTrunkGroup name) media lateMediaSupport passthru