asterisk users - Mar 2005 - SIP Client at outside and connect to an Asterisk Server sit behind NAT with SER

Hi ,

I have setup SER and Asterisk on the samebox (behind a NAT) and try to 
connect to SER from outside using Xlite.
But I got 405 error.

Here is my setup diagram.
                                                                        NAT
SIP Client ----- Internet ----(PPPoE ---Router ---SER+Asterisk)
                                              Same Network

Can anyone please highlight to me where went wrong?
I am using dynamic DNS for my SER + Asterisk and using a dynamic DNS 
domain name for my SIP Client.

-- 	
Thanks and Regards,
Stephen Liew

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