Have a customer that has IP-KCCIS between 2 locations that has been working with no issues for years. They recently installed Velo Edge 620 equipment and ever since then they have 1 way audio between sites. They say no IP Address's changed. I informed them to make sure ports 10020-10531 are open and not being blocked as well with SIP ALG disabled. I have a scheduled conference call with them. Is there anything else I should ask the IT company. We have no access to remote programming and they do not want us onsite. Thanks.

FYI...The network engineers ran Wireshark with call examples. The network engineers had me reboot both SV9100's and after that it works fine now. The network engineers said that when they installed their new equipment sometimes the MAC Address's do not release from the NEC equipment. Never seen that before.