Incomming calls not working

Hi. I have just installed freepbx. I have updated all my modules and configured a SIP Trunk to my ISP. I can successfully make outside calls and calls between extensions. I can’t receive any calls via my ISP SIP Trunk. FreePBX status shows that one trunk is online and registered.

If I setup my SIP Phone with the ISP SIP details I can make and receive calls, but it does not work through the PBX.

Can somebody direct me where to start my troubleshooting

You could start with

http://wiki.freepbx.org/display/SP/Troubleshooting

to get yourself past the normal misconfiguraes.