Re: [h323plus] crash when SessionID=0

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@cern.ch mailto:domarack@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