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T37 offramp faxing to a internal fax machine

Is this configuration supported ?

A unity subscriber sends a fax via email to a destination fax and say that machine is plugged into a vg224 (under control by Callmanager). Unity sends the fax using t37 to the voice gateway. Voice gateway receives the fax attachment via the MMOIP dial-peer and then send the call via a VOIP dial-peer (T38 or Cisco fax relay or fax passthrough) to Callmanager. Callmanager then sends the call to VG224 which is also enabled with Cisco fax relay, T38 or Fax passthrough.

Is this kind of hairpinning between a MMOIP dial-peer and VOIP dial-peer for faxing supported or even possible ?

  • Unified Communications Applications
Cisco Employee

Re: T37 offramp faxing to a internal fax machine

The voice gateway can't receive a fax using t37 and then send it out via t38 (not supported and won't work). It would have to go out a pots dialpeer.