Fax T38 Over IP : Is it related to Software MTP CUCM

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May 20th, 2008
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I have implemented VOIP and CUCM for enterprise solution.


My setup is like this:-


Fax1>>CCM5.0>>IPIPGW(transcoder)>>SSW>>Gateway>>PSTN>>Fax2


What is the possibility of FAX T38 not going through even the call signaling & setup have been established and fax tone heard, but there are no response from remote fax.


Is it related to CCM5.0 MTP? As I have this "MTP" check at the SIP trunk to the SSW for sending SIP early-offer.

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smalkeric Mon, 05/26/2008 - 13:32
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Could you provide the details of these debugs

debug h225 asn1

debug h245 asn1

debug vtsp all

debug voip ccapi inout

debug cch323 all


noxkrugger Mon, 05/26/2008 - 13:46
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My apologize.. the CCM actually is connecting ti the IPIPGW.. it is connected to the SSW>> PSTN GW>>> FAX 2.


Attached is the log captured from the CCM..


Fax called from 13324220 to 0060380243462.


I got request time-out error and "request pending error" from the SSW.


Is it related to Carrier/Provider problem or MTP itself?



noxkrugger Wed, 06/18/2008 - 09:17
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We are not using any fax server. We did fax call to the PSTN fax. Actually, what is the purpose of fax server?

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