X-Lite _can_ dail out to FWD through a firewall but Asterisk can't. SO this gives us the perfect chance to compare the content of outbound packets where we have a working and non-working example.
X-lite when configured for FWD behind a NAT uses an outbound proxy for that connection. That means that ALL sip messages to anyone go to the outbound proxy instead of any other proxy. Just ignore doing SRV lookups, send everything outbound to one place. Like a Web proxy server, that receives everything. X-lite have a configuration that says "outbound if nat" - which is what you do in a web browser - "don't use proxy if local address'.
I'd look into hacking Asterisk to mimic the X-Lite generated
SIP protocol.
It's part of the SIP standard. http://www.voip-info.org/wiki-SIP+outbound+proxy
Put the result on the wiki. Doing this will greatly speed up the fix.
http://www.voip-info.org/tiki-index.php?page=Asterisk+SIP+NAT+solutions ...as a start.
There's a pointer to my bug report on the wiki. Read it and make comments on that page - it's easy to track changes there since changes are mailed out.
/O
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