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MGCP T38 Fax Setup

I am trying to get a fax server setup.  The setup is:
Gateway > MGCP > CUCM > SIP > Fax Server.  I can get it to work if I use G.711.  If I try to use T.38 the faxes fail with the error T30 Timeout T1.  When looking at Wireshark on the fax server, the gateway never responds to the fax server.   Below are my settings for MGCP.  Gateway is running version 12.4(23) and callmanager is 7.1.5.

 


mgcp
mgcp call-agent 10.110.11.101 2427 service-type mgcp version 0.1
mgcp dtmf-relay voip codec all mode out-of-band
mgcp rtp unreachable timeout 1000 action notify
mgcp modem passthrough voip mode nse
mgcp package-capability rtp-package
mgcp package-capability sst-package
mgcp package-capability pre-package
mgcp default-package fxr-package
no mgcp package-capability res-package
no mgcp timer receive-rtcp
mgcp sdp simple
no mgcp fax t38 ecm
mgcp fax t38 nsf 000000
mgcp rtp payload-type g726r16 static
!
mgcp profile default
 

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