[h323plus] crash when SessionID=0

Igor Pavlov pavlov.ig at gmail.com
Wed Aug 18 09:42:03 EDT 2010


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>

> 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.htmland 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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