I have a large number of Cisco 7960 phones with SIP firmware 8.12 (P0S3-8-12-00) which I would like to use with a premium PBXes account. They are located in branch offices behind NAT gateways. Has anyone made this work? This may be the same issue: http://www1.pbxes.com/forum/thread.php?threadid=1553
I second this. This would be useful.