kornflake: try changing the host to the IP address
I don't think it's the infamous Asterisk DNS issue.
You could always try quality=yes to send SIP NOTIFY messages which will keep the NAT table in the firewall open. There really is no need for a port forward.
Hmm, this appears to be resolved now. I have upgraded to the latest version of raspbx (raspbx-12-08-2013), and it seems to have held the registration correctly, I haven't touched it since last night and I just made a call and was able to get through.
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