Have a look at http://www.voip-info.org/wiki-Asterisk+SIP+NAT+solutions
If you sip client is behind firewall you will not be able to connect to FWD. However you can get around by using IAXTEL. check out this page:
www.iaxtel.com/setup.html
David Kwok
Thanks for that.
Actually, my machine has both an internal IP and a real IP address, so I didn't think I would need to turn on the NAT settings. But, stupidly, I set the binding interface of SIP to my internal address only - which probably explains my problems. I have now changed the binding back to 0.0.0.0 and all is working.
(Well... the 'logging on' part anyway - i'm still having call problems bridging calls with an SIP phone, but that's another matter....)
Thanks again!
Terence
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