Fax calls Fail, SBC Unable to Transcode from T.38 (core) to G711fb/PCMA (peer) (Doc ID 2208466.1)

Last updated on MAY 17, 2017

Applies to:

Acme Packet 3820 - Version S-Cx6.4.0 and later
Information in this document applies to any platform.

Symptoms

Transcoded calls from T.38 to G711fb does not work well. In signaling everything looks ok.

T.38 INVITE is forwarded with m=0 port for t38 and adding a new m= audio line to the end of SDP, which is all good. Then SBC receives 'fcs-BAD-sig-end' from the endpoint and and 'no signal' thereafter.

Cause

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