I also have some problem with Axon & Linksys SPA3102.
I can call from outside line to PSTN and the call is transfered to Axon extensions (in group 701 for example), the extension rings but I don't see the Caller ID: however the softphone displays the name I gave to the gateway and the User ID for external line in Axon. I set "PSTN CID for VOIP CID" to yes, but the same.
The other problem is how to dial from my Axon extension to an outside line via Linksys gateway. I try setting the dial plan with several settings, but no success. The phone dialed, Axon reports as "answered" and after that I can hear just the dial tone from outside line. It seems as Linksys doesn't pass the number to the outside line to be dialed.
Some ideas what to do?