Re: [h323plus] crash when SessionID=0

OK I see. So far I implement the other way. I already sent the patch to Simon, but I don't know if he put it to CVS. If you are interested, I can send you the patch. Would it be possible to get the patch from you for the changes you did in h323plus lib? Thanks,

Marek

On 08/18/2010 04:38 PM, Igor Pavlov wrote:

Now, I have no available MXP for tests :( but when I had it I found out the way to open extended video channel :

1. Send Generic request
2. Wait for Generic response
3. Send Generic Indication
4. Send OLC(extended video channel) with sessionID = 0 (!)
5. Send miscellatiousIndication LogicalChannelActive

18 августа 2010 г. 18:17 пользователь Marek Domaracky <domarack@cern.ch mailto:domarack@cern.ch> написал:

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

-- Игорь Павлов