XSTIM Packets dropped on UCX 7?

[PainOfDeath]

Wondering if anyone has experienced this or similar; seems to be my network/hypervisor so E-MetroTel can't assist further. I have had a UCX version 7 running in my home office environment for a few months, with an assortment of XSTIM/Unistim phones, both on site and remote, digital and IP, connecting with no issues. This is running as a Hyper-V instance on my local server. Since about a week ago, all XSTIM/Unistim devices are failing to connect (server unreachable). ALL other network functions are normal, SIP devices and trunks are fine. Packet captures on my network and the UCX itself indicate that the phones reach out to initiate the handshake, the UCX responds, but the response never gets back to the phones; UCX eventually gives up.

I have tried changing everything; router, switch, and so forth. I have a hardware UCX250 that I tried on the same network, and phones connect to it just fine. E-MetroTel allowed me to temporarily license another VM for testing but I get the same problem. I tried adding another NIC to the server dedicated for the UCX, with no change. It's only XSTIM/Unistim that seems impacted. Disabling firewalls across the board makes no difference either.

I realize this is maybe more of a network issue and not a UCX issue but wondering if anyone has the version 7 release in theirs or customer environment experiencing something similar. Every UCX I ever sold has been version 6, they just gave me version 7 to try out before wider release.

Any input would be appreciated. Thanks!

 

[Tele-tech]

Do you have any whitelists/blacklists on the egress port of your VM NIC? Or anything on your local network? What network equipment are you using?

 

[PainOfDeath]

There are no whitelists/blacklists or anything of that sort on the network. I tried creating allow rules on the hypervisor firewall, and just disabling the firewall altogether, but it made no difference. The switch equipment is Netgear with an Untangle router but I have tried other switches/routers with the same results.