[Asterisk-Users] Re: How to best debug SIP registration failure

[Olle E. Johansson]

If you see nothing with full verbosity and SIP debug turned on, the Asterisk SIP channel gets nothing.

The reason why we always mix in NAT with questions like yours is that in 90% of the cases, NAT
is the problem. It's just a standard response, like when Microsoft support tells you to reinstall
windows :-)

Do you see any packets going to and from FWD when using SIP debug? You should.

If you don't see any packets with SIP DEBUG and can still see that Asterisk registers with FWD,
there's a lot of fishing to do in your system :-)

If you see those packets going to and from FWD, but not the Grandstream registering, there's
a problem between the IP stack and Asterisk. If you have multiple interfaces, the problem might
be the IP address Asterisk bind to and the routing between the IP address Grandstreams send
packets to.

Still an apprentice on how to fish with Asterisk... Eager to know what goes on in your system,
so we can document it and maybe fix it.

/O