I want to configure Voice gateway and Unified Call Manager 6.1 for the Fax Server (GFI Fax maker). Fax server support only SIP and T.38 for fax protocol.
The Voice gateway is already configured with unified Call Manager using MGCP protocol.
Can any body help me out regarding this scenario.
I am not familiar with the GFI Fax maker fax server but if it supports T.38 over SIP then this should work, especially if this fax server uses a Dialogic fax engine such as SR140.
On the Unified CM, you need to configure a SIP trunk pointing to your fax server using the G.711 codec. On your existing MGCP gateway, you need to configure protocol-based T.38 fax relay. By default the Cisco MGCP gateways use an NSE-based switchover for T.38. The commands to configure protocol-based T.38 on the MGCP gateway are -
no mgcp fax t38 inhibit
mgcp default-package fxr-package
mgcp package-capability fxr-package
The first two commands above should be enabled by default. You must then reset the MGCP process on the gateway for these commands to work ("mgcp", "no mgcp" in config mode).
Confirm that you have the call routing configured correctly on Unified CM and then give this a try and let us know how it works. You also may want to contact the fax server vendor and confirm interoperability with Unified CM and see if they have sample configs available.