[OpenSER-Devel] Possible bug in nathelper

[Peter Spikings]

On Friday 13 July 2007 15:11:37 Ovidiu Sas wrote:
> This issue has been discussed many times on the list.
> It looks like that you are trying to do a double manipulation of SDP.
> If you are "forcing" the SDP/media, do not touch again the SDP.

I'm only calling it once, didn't realise that force_rtp_proxy rewrote the sdp 
too. Now I have another issue however.... the onward SDP is now correct now 
that I just call fix_nated_sdp with flags of 8 to just rewrite the owner but 
rtpproxy is now being told to relay RTP from the private address of the 
behind-NAT client. Hence both ends send RTP to rtpproxy which drops it.

> Maybe the nathelper doc should be updated with this information.

Yes, or maybe allow the SDP to be rewritten twice. Presumably one type of 
rewrite is just appending to the connection IP address in some circumstances.

Thanks for your help,

Peter.

>
> Regards,
> Ovidiu Sas
>
> On 7/13/07, Peter Spikings <peter.spikings at power.net.uk> wrote:
> > Hi all,
> >
> > I'm having a problem getting the nathelper module to rewrite the SDP of
> > an invite. The call I make is: fix_nated_sdp("10", "aaa.bbb.ccc.ddd");
> >
> > The resulting invite has the form (part of a tshark/tethereal dump):
> >
> > Message body
> >     Session Description Protocol
> >         Session Description Protocol Version (v): 0
> >         Owner/Creator, Session Id (o): root 3299 3300 IN IP4
> > aaa.bbb.ccc.ddd Owner Username: root
> >             Session ID: 3299
> >             Session Version: 3300
> >             Owner Network Type: IN
> >             Owner Address Type: IP4
> >             Owner Address: aaa.bbb.ccc.ddd
> >         Session Name (s): session
> >         Connection Information (c): IN IP4 aaa.bbb.ccc.dddaaa.bbb.ccc.ddd
> >             Connection Network Type: IN
> >             Connection Address Type: IP4
> >             Connection Address: aaa.bbb.ccc.dddaaa.bbb.ccc.ddd
> >
> > I'm posting here because surely it's a bug that that happens.
> >
> > Any help appreciated.
> >
> > Thanks,
> >
> > Peter.
> > This message has been comprehensively scanned for viruses,
> > please visit http://www.avg.power.net.uk/ for details.
> >
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-- 
Peter Spikings
Research & Development Software Developer
Powergroup

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