How can I explain my problem? I think, the best way is a picture. Hopefully, it's clear..
Case: a remote worker with X-Lite on the pc can hear the other one. But his own stream are delivered on a wrong IP (local private IP of the WAN UC500), see the picture what I mean..
Any ideas what the solution could be?
I have had a few issues like this in the past... and they all turned out to be a routing issue... where I can hear one way audio but the other end could not hear me... or vice versa..
Make sure all your IP PHone endpoints can route to all other subnets for both data and voice vlans. Maybe a acess-list is blocking the 10.1.1.X from getting back to your remote subnet.. but allowing your remote subnet to talk to 10.1.1.X.