Re: [Linphone-users] Re-registration after 200 OK reponse with 'receive' tag in Via header

[Simon Morlat]

Hi Jos,

The only way to have correct IP address and ports in SDP is to enable
STUN and have a stun server on the public internet.
The received/rport params are useful for SIP but are indeed useless for
SDP (RTP ports).

Simon

Le mercredi 10 novembre 2010 à 18:24 +0100, Jos Huybrighs a écrit :
> All,
>  
> I have an issue with linphone in conjunction with a specifc SIP
> proxy/registrar and am not sure whether the following is correct
> behavior of linphone:
>  
> - A couple of linphone devices run on a subnet (e.g.
> 172.10.100.x) that is different from the main SIP network where also
> the proxy/registrar sits (e.g. 10.10.20.x).
> - There is a Linux router connecting the 2 networks without using NAT,
> nor STUN.
> - The 200 OK response on the first REGISTER request returns with a
> 'receive' tag in the Via header that holds the egress IP address of
> the router (e.g. 10.10.20.33). The 'receive' tag in the header is
> added by the SIP proxy which is correct proxy behavior as far as I
> know.
> - Because of the 'receive' tag (at least that is what I think)
> linphone however makes a 2nd REGISTER request. This time with the IP
> address of the 'receive' tag as Contact header.
> - When receiving the 200 OK response linphone considers itself well
> registered.
> - When linphone establishes an outgoing call it puts the last
> registered contact address (10.10.20.33) as media sink address in the
> SDP connection field which obviously does not work.
>  
> Can someone shed some light on this?
>  
> Thanks,
> Jos
>  
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