Problem with T.38 and T1 CAS

Unanswered Question
May 31st, 2007


I have a problem with the Fax-Server and Cisco 2811 as H.323 Gateway. I can see the incoming fax-calls on the Cisco 2811. First, the call does connect with G711?law to the Fax-Server. After then the session changes from G711?law to T.38. The Problem is that the Cisco 2811 does not send fax-data to the Fax-Server. The T38 stream is empty. Before we have shipped the Router to the US, we tested the config in Germany with an E1-line. The test was successful (sending and receiving faxes). I think we have a problem with the T1 but i don`t see a mistake in the config.

T1 line from AT&T:

Applikation: PBX

Service Type: Voice Only

IDSN Version: National 2

Arrangement: PRI Voice Only CBC/CPN

D-Channel Configuration: D Channel per T

Channel Type: DID/DOD

Pulse Type: DTMF

DS1 Termination: Smartjack

Hunting: FIFO

Therefore I ask for assistants, can you help us, please.

with kind regards


I have this problem too.
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