FWIW, I've had both halves of my PAP2 registered to Voxalot since the beginning of time and it has always worked perfectly. One half is on port 5060 and the other half is on 5061. I use STUN server support AND I have port forwarding in effect through my router. Both ring simultaneously on incoming calls and either can answer. When one is in use, the other continues to function fully as you might expect.
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