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_SBC 5100 5200 Unsupported
_SBC 5100 5200 Unsupported

Warning
titleWarning

This feature must be enabled only when dialog transparency is enabled.

Feature Overview

The SBC Core is enhanced to address a scenario where early dialogs at the egress leg are retained at the ingress leg, and the callID is transparently relayed to/from the private to the public network.

With this enhancement, the SBC sends out multiple 18x messages (when using the Dialog Transparency feature) even when the ingress leg does not support 100rel/PRACK. The SBC processes all 18x messages with SDP answers (with different codecs) received at the egress leg, and then sends ingress SDP answers in all of the 18x messages at the ingress leg.

Additionally, the generateCallIdWithDialogTransparency flag is added at the Zone level for the SBC to natively generate the callId on the egress leg when the Dialog Transparency is enabled.

Info
titleNote

To use this feature, you must enable the following flags:

  • Transcode Free Transparency – on both legs
  • Dialog Transparency – on both legs
  • Downstream Forking Support – on the egress leg (The SBC supports up to 10 forked calls)


Info
titleNote

The SBC transparently relays the PEM header to the other leg only when the pEarlyMedia transparency flag is enabled.


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