[Serusers] why mus use force_rport()??

[Marian Dumitru]

Hi Sun Zongjun,

If Via has no received or rport parameters, SER will use the IP:port
advertise in Via to send back the reply - which is broken when you deal
with natted requests, since the Via port has the device port, but rport
has the NAT port.

Best regards,
Marian

孙宗君 <zjsun at biigroup.com> wrote:
> Hi, All:
> I just tested the SER+RTPProxy. My ser and rtpproxy
> are located on the same machine with public ip address.
> my SIP UA is behind the NAT device(Symmetric NAT). When
> UA registered to SER, the SER send the response to the
> port specified in the Via head parameters, not the
> real port receiving the Registration request. After
> I put the force_rport() in the ser.cfg, all will
> works well. I wonder why the SER doesn't send the
> response back to the receiving port. Whether that
> conflicts the RFC3261 chapter 19.
>  I am glad to hear your advice and help
> Best Regards
> Sun Zongjun

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