Hi, We have a Vodavi XTS - IP system with VOIP.

The VOIP stopped working awhile ago the system is fine but I can not seem to get it working (VOIP). I have got another card- VOIP I can see the VOIP is online with static IP. Everything seems fine but none of the phones will connect.
I have used every possible combo on the remote phones - I have tested many locations. I have checked all firewalls.

Thanks in advance for any help