[h323plus] crash when SessionID=0

Marek Domaracky domarack at cern.ch
Wed Aug 18 10:17:29 EDT 2010


Hi Igor,

I'm testing as well with MXP and in my case MXP sending always 33 and 
higher. So far I had a problem only with the Mirial.
What I have so far is just one way channel from the device to my 
application. Are you opening extended video form your application to the 
MXP?
If I understand correctly if you send OLC with sessionID != 0 Tandberg 
will reject?
Thanks,

Marek



On 08/18/2010 03:42 PM, Igor Pavlov wrote:
> I wnat to enlarge...
> When Tandberg (MXP) sends extended video channel, it sends 
> sessionID=0, and only in OLCAck it accept actual sessionID.
> If send OLC for extended video with sessionID != 0 than Tandberg MXP 
> sends OLCReject (InvalidSessionID).
>
> 2010/8/18 Marek Domaracky <domarack at cern.ch <mailto:domarack at cern.ch>>
>
>     Hi,
>
>     I'm working on H.239 implementation and find out that devices
>     might ask SessionID=0 for a new video channel. In particular I did
>     a test with Mirial.
>     I was checking the  thread
>     http://lists.packetizer.com/pipermail/h323plus/2009-December/001269.html
>     and it's mentioned that the SessionID=0 is invalid.
>     I know it's not following the standard as for RTPSession  the
>     range is from 1..255, but for compatibility, don't you think we
>     should allow it? I did a test call from Mirial to Tandberg and
>     Tandberg didn't have a problem with it.
>     The lines involved are
>     rtp.cxx
>     from  PAssert(id > 0 && id < 256, PInvalidParameter); to
>     PAssert(id >= 0 && id < 256, PInvalidParameter);
>     and
>     h323.cxx
>      // We must have a valid sessionID
>      if (sessionID < 1 || sessionID > 255) to if (sessionID < 0 ||
>     sessionID > 255)
>
>     Thanks,
>
>     Marek
>
>
>
>
>
>
> -- 
> Игорь Павлов
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