This is just a speculative shot in the dark, but remember that the domain of 
the From URI is important, and that the authentication "realm" (domain) is part 
of the authentication credentials.  So, what you have in your 'fromdomain' and 
'host' settings on the peer does matter.

--
This message was painstakingly thumbed out on my mobile, so apologies for 
brevity, errors, and general sloppiness.

Alex Balashov - Principal
Evariste Systems LLC
260 Peachtree Street NW
Suite 2200
Atlanta, GA 30303
Tel: +1-678-954-0670
Fax: +1-404-961-1892
Web: http://www.evaristesys.com/

On Sep 30, 2011, at 3:16 AM, "cnasterisk" <cnaster...@163.com> wrote:

> hi,
>    Dear all.
>    I setted a sip account on a sip trunk. when a  client call via this sip 
> trunk, asterisk call failed on this trunk.
> I have captured the sip messages on the host where asterisk located, and 
> found that:
>  
> 1. asterisk send a INVITE message to remote sip proxy without 
> "proxy-authorization" field.
> 2. the remote sip proxy send back a " SIP/2.0 407 Proxy Authentication 
> Required" message.
> 3. asterisk send a INVITE message with  "proxy-authorization" field.
> 4. remote proxy send back a "403(Forbidden)" message, that is mean "wrong 
> password"
>  
> I also tested the sip account on a softphone, it works normal!
>  
> why this happed? and how can i solve it?
>  
>  
>  
> 2011-09-30
> kevin
> --
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