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This is an LA release that will only be provided to a select number of PLM-sanctioned customers (PDFs only). Contact PLM for details.

The SBC Core supports the following Real Time Control Protocol (RTCP) modes for media:

RTCP Modes for Media

RTCP Mode

RTCP Behavior

RTCP Relay for pass-through calls with RTCP enabled on both legs

RTCP is relayed between two end users. The SBC will not terminate the RTCP sessions; however, it will set up the media-path to forward RTCP packets from one party to the other.

This is the default and recommended approach for handling RTCP for pass-through calls.

RTCP termination for a pass-through call with RTCP enabled on only one leg


RTCP for transcoded calls legs

If RTCP is enabled on the leg, the SBC will terminate RTCP.

In either pass-through or termination modes, the SBC collects packet RTCP statistics and reports them for output to CDRs. Configurable parameters include:

  • Media peer inactivity—Configure media peer inactivity time out value. When using this feature, you must also set the flag, peerAbsenceAction, from the Packet Service Profile.
  • Media port range—Use this control to set the UDP media port range for RTP and RTCP.
  • Media RTCP control—Configure sender report interval.


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