Unanswered Question
Oct 25th, 2009

Hi All,

I've setup MTP IOS in CUCM for MGCP T.38 faxing which is required for inbound faxing for Exchange 2007.

then create two MRG, one has IOS MTP and the other one has CUCM MTP. then create MRGL that has MRG (with MTP IOS) and MRG (CUCM MRG) respectively.

when I dial voicemail pilot number, fax is working but DTMF tone is not recognized. when I switch the order of MRGs in MRGL, then fax is not working but DTMF tone is recognized.

How can I setup MRGL and MRG that make both DTMF and MGCP T.38 faxing work at the same time?

any suggestion would be very appreciated.



I have this problem too.
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gogasca Sun, 10/25/2009 - 11:14

Whats the config in IOS Router for MTP ?

can you show us show sccp also

Whats the configuration for MGCP

canyou attach it, everything for mgcp after

mgcp command.

IOS version

and CUCM version as well.

alex goshtaei Mon, 10/26/2009 - 14:22


Please find the "show run" in the attachment.

IOS version: 12.4(24)T


is DTMF problem related to the gateway or MGRL configured in CUCM? the second MRG group which has MTP1 and MTP2 (for sub and pub respectively) is supposed to take care of DTMF tone, but it seems it doesn't.

any help would be very appreciated.


alex goshtaei Thu, 10/29/2009 - 16:03

Hi All,

I am still waiting to get a answer from this. tonight I am working on this and trying to fix it. any comment or suggestion, would be very appreciated.




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