i've installed a CUCM 9.1.2 cluster with Cisco 8945s, Cisco 9971s all running SIP Protocol. We have introduced the Cisco DX650 into the voice network, and all features are working normal on the Local LAN. We are now testing the DX650 for a remote worker. the Problem i'm seeing is that the DX650 will VPN into the network, email, Jabber, Calendar, Internet all work fine and is on the network via VPN. the one issue is that the DX650 will not register with Call Manager. we have allowed all the necessary ports through the firewall. i've tested with Cisco IP Communicator and it registers fine for the remote worker, but the DX650 will not register.
What can I do to troubleshoot this or see where it's getting hung up at? I want to see logs which shows the DX650 making an attempt or not.