Hello Adams, I have UPLINK and AXON and SkyPe registered well.
But like what you are experiencing, I was able to ring my cell phone, my home phone, and even to another Skpye user. But then after the ring (about 5 seconds) it disconnects.
The Uplink log reports (like what you have)
"Call Failed: User may not be online or the number you dialed does not exist"
The AXON actually reported:
487 Request Terminated
I tried this is several ATA, including a PAP2, GXP-2000, HT-487.
datu503