Unanswered Question
Nov 9th, 2007
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Has anyone gotten this to work successfully?

I am using RightFax with SR140. The call goes out the PSTN and connects to the far end fax, but cannot negotiate the proper RTP.

I have verified all codec, relay, etc. MGCP T38 is supposed to be supported with CUCM6.

Any ideas would be great.

Thank you,


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gogasca Sun, 11/11/2007 - 00:03
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Hi Jon,

Yes...we do support T.38 and CCM 6.0

What is your current setup?

Sr140 -- H323 -- CCM -- MGCP ?

In 4.2(3) and 6.0 afaik when CCM downloads the config to the MGCP, it no longer includes the T.38 FAX inhibit command....which is a problem if you don't have a gateway IOS version that supports it:

12.4(7.12) / 12.4(7.14)T or later.

To be honest I have only tested in 4.2(3) but should be the same logic.


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