Has anyone been able to successfully connect a Nortel CS1500 VoIP communications server and a Cisco 7960 ip phone (sip)? The 7960 is on the supported list, but I can't seem to make it register with the CS1500. I can get other phones to register without problem (grandstream, etc). Just wondering if anyone has any tips on how to do this. While I'm at it I'm also wondering if anyone's managed to make a CS1500 talk to asterisk? If so, I'd be very interested in how.