test calls pstn-R3

When I do a test call from the pstn to R3 it gives me a half a ring and then i complete silence and on the IP Blue on the PC softphone does indicate there is a call coming in. I did a debub on R3 and its stating the call is being completed. Also I see the default  IP on top of the screen on the phone ;however when i make a change in the configs in R3 it takes it. Is that suppose to show the 177.1.150.X ip address or 177.3.71.X? My question is why the  IP Phone is not working ringing? What could be the possible cause(s). Also I can not get the Cisco IP Communiator to register. I change to TFTP server settings and i continues trying  to register.

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