20.30 Record-Route
The Record-Route header field is inserted by proxies in a request to 
force future requests in the dialog to
be routed through the proxy.

So record route is used by proxy, it is legal.
Einat Soudry 写道:
> Hi 
>
>  
>
> I have a case that a proxy processes INVITE message and forwards the message
> from a source port that is different from 5060,
>
> But the port added in the Record -Route and Via headers is 5060.
>
> Is it a normal behavior that the port in the Record -Route/Via header is
> 5060 although it is different from the used source port?
>
>  
>
> Thank you,
>
>  
>
> Einat
>
>  
>
>  
>
>  
>
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