Session Border Controller (SBC) Transcoding DTMF Telephone-events From 102/99 To 101 (Doc ID 2434242.1)

Last updated on SEPTEMBER 29, 2023

Applies to:

Symptoms

Intermittent issue where DTMF is failing due to the SBC sending the RTP packet for DTMF with the wrong Payload type.

1. One issue reported as SBC transcoding DTMF ( RTP packet ) telephone-events from 102 to 101

2. For another failed scenario there is a Reinvite from the far end which did not change the SDP (increased the version only) agreed to use telephone event 99. Again DTMF 1 was sent to the SBC as Payload type: telephone-event (99) but in this case the SBC sent to the far end Payload type: DynamicRTP-Type-101 (101) in the RTP packet causing the far end not to recognize the DTMF.

Basically it happens for the dynamic plaods.

Cause

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