Hi everyone, to start I am not an Avaya expert.
I have a client that has an issue with their Avaya system and extension to extension dialing.
They have two Avaya PBX units; IP500(Site1) and an IP500v2(Site2) on either side of the WAN.
Site1 is an existing site and has been up for over 3 years.
Site2 is a new installation and addition.
I had recommended and installed Sonicwall TZ205 devices at each site and configured a site to site VPN for each office. The VPN is up and from all accounts is working properly.
I can ping the Avaya PBX boxes from either side of the WAN. For that matter, all communication is function correctly across the WAN.
The issue is when trying to initiate extension to extension dialing to phones on either side of the WAN.
The error message that appear on the phones are:
From Site1 they dial ext 510 located at Site2 – After long pause it showed: "Unobtainable 510".
From Site2 they dial ext 420 located at Site1: "Incompatible 420".
Here is the interesting part, their Avaya tech says this is because the firewall is dropping the Avaya communications between sites.
I totally disagree as the VPN is a trusted link and I have allowed all traffic between the two sites over VPN.
Does any one have any thoughts on this issue?