Hi Ray,
Could you please provide the following:
> The complete call flow which has this issue. ( Example : PSTN >> PRI >> Voice Gateway >> MGCP >> CUCM >> H.323 >> VG224 >> Fax Machine ).
> Are we doing T.38 or Modem Pass Through for fax?
> Please share the running configuration of all gateways involved in the call flow.
> We will gather CCM traces and corresponding debugs ( of which I will let you know ) as soon as I have the above information.
Regards,
Jagpreet