I've got a UC520 connected to an ESW540, which is then connected to another ESW540 in another building by a fibre link. The fibre link is run through two 3Com Surestack switches (old), while we wait for new fibre cables to link the ESWs directly.
Using CCA I can see the remote ESW and configure it. Client PCs are conected and working fine, but IP phones (SPA525G and SPA504G) do not pick up an IP address. I am assuming that something is causing a problem with the VLans on the way over.
Is there anything I can do to prevent this? I don't mind a less than ideal solution as it should only be temporary.