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

Unanswered Question
May 20th, 2008
User Badges:

I have implemented VOIP and CUCM for enterprise solution.

My setup is like this:-


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.

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
smalkeric Mon, 05/26/2008 - 13:32
User Badges:
  • Silver, 250 points or more

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
User Badges:

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
User Badges:

We are not using any fax server. We did fax call to the PSTN fax. Actually, what is the purpose of fax server?


This Discussion