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Apparently the issue was on our Voice Gateway (which is H323). Cisco suggested the following:"Add 'incoming called-number .' to one of the voip dial peers on the gateway...dial-peer voice 20 or 30 voip...." "dial-peer 0 was trying to setup using g722...
I have the same issue with the 7937 phone forcing g722 and have also have a tac case open. Did you ever have a resolution to this issue? I'll post back here if I get a satisfactory answer myself.