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RightFax 9.4 SIP

I have a really weird issue that I can not figure out. I have a RightFax server running 9.4 SIP to our CUCM 8.0.3 then MGCP  to a 2951 router out to the PSTN via a PRI circuit. I have a test PRI that works fine  from the PSTN to the RightFax server but when I plug in our production PRI  the call is being answer by the RF server but after a few seconds the caller just receives a busy signal. I have captured the ISDN information and it all looks good. The path is the same for both PRI's and I have all the correct settings enabled for T38. Any Suggestion?

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