I setup PIAF purple with freepbx 2.9, and the installation went well.
However, I can't see to stay registered with open VFX. I also set up a free 2talk trunk and that is fine.
The error I get is that VFX registration timed out. I've seen it register but then after 5 mins or so the registration is lost. Even though the registration is lost, I can still call out, but can't receive calls.
With sip debug on I see the registration messages going out. Not sure if the CLI is supposed to show any responses.