[SR-Users] RTPProxy issue?

[Igor Potjevlesch]

Hi Maxim,

 

Hard to do because it's in production.

I have a serious finding since yesterday on how this happened. 

 

My understanding is that the function "ts_less" returns FALSE into "rtp_resizer.c" because the timestamp between the two packets is > (1 << 31) [for example: 3740425320].

That's result in a drop of any following packets as I can see it into a capture.

 

Regards,

 

Igor.

 

De : sr-users [mailto:sr-users-bounces at lists.sip-router.org] De la part de Maxim Sobolev
Envoyé : vendredi 6 mars 2015 07:44
À : Kamailio (SER) - Users Mailing List
Objet : Re: [SR-Users] RTPProxy issue?

 

Hi Igor, that's bit strange, since the rtpproxy is not checking any of the rtp flags including marker bit. It would help if you can post a tcpdump capture of the streams in question along with the log output of the rtpproxy running at the "dbug" level. Thanks!

On Mar 5, 2015 5:54 AM, "Igor Potjevlesch" <igor.potjevlesch at gmail.com <mailto:igor.potjevlesch at gmail.com> > wrote:

I reviewed again a call trace and I can be more precise: a RTP packet comes with a new SSRC and the Marker bit set to "True". This packet is properly forwarded.

 

Then, just after this packet, another RTP packet containing a new SSRC with the huge timestamp and the Marker bit set to "True" is coming from the UA. 

The RTPProxy stops forward since this packet.

 

Regards,

 

Igor.

 

De : Igor Potjevlesch [mailto:igor.potjevlesch at gmail.com <mailto:igor.potjevlesch at gmail.com> ] 
Envoyé : jeudi 5 mars 2015 11:34
À : miconda at gmail.com <mailto:miconda at gmail.com> ; 'Kamailio (SER) - Users Mailing List'
Objet : RE: [SR-Users] RTPProxy issue?

 

Hello,

 

Thank you.

 

Just to let you know, the RTPProxy is running in bridging mode.

Regards,

 

Igor.

 

De : sr-users [mailto:sr-users-bounces at lists.sip-router.org] De la part de Daniel-Constantin Mierla
Envoyé : jeudi 5 mars 2015 09:33
À : Kamailio (SER) - Users Mailing List
Objet : Re: [SR-Users] RTPProxy issue?

 

Hello,

maybe Maxim (cc-ed) will be able to provide more insights.

Cheers,
DAniel

On 04/03/15 16:59, Igor Potjevlesch wrote:

Hello,

 

I discovered an issue related to the handling of "timestamp" and/or "Marker bit" with rtpproxy (I use the latest Extension 20081224).

 

The call-flow is the following: one UA places a call to A and put this call on hold. Then, the same UA call another number B. Individual streams are ok.

When the UA tries to transfer A with B, the RTPProxy receive a RTP packet with a huge timestamp and the Marker bit set to "True".

 

Just after this RTP packet, RTPProxy stop forward the RTP packets from A to B. B to C is still working.

 

Anyone have an idea?

Regards,

 

Igor.

 

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