said by 34574589:I just did a test, when I call from my cell to my home ATA the zippyphone rings for a spit second, then the ATA continues to ring normally.
This works properly here, but I can't think of what might be different. AFAIK the zippy is just another registration and if the ATA is not answered the zippy shouldn't even know it is there. Try capturing the traffic on the zippy PC and see if a CANCEL or other SIP request is causing the ringing to stop. Otherwise, some software or hardware glitch might cause the phone to stop ringing; see if setting it to ring the computer audio behaves any better.