[h323plus] Valid sessionID in OpenLogicalChannel command

Igor Pavlov pavlov.ig at gmail.com
Tue Dec 29 02:07:23 EST 2009


Thanks, now it works fine!

Igor

29 декабря 2009 г. 3:14 пользователь Simon Horne
<s.horne at packetizer.com>написал:

>  Igor
>
> There are 2 things here.
> 1. compensate for the T1000 inability to renegotiate the channel on
> master/slave conflict. (it should be the slave but ignores the message from
> H323plus) so that you still get audio.
> 2. ensure that if the OLC does contain an invalid sessionID that we avoid
> the assert and reject the OLC.
>
> I have checked a patch into the CVS (h323.cxx,h323neg.cxx) that should
> resolve both problems.
>
> Simon
>
>  ------------------------------
> *From:* Igor Pavlov [mailto:pavlov.ig at gmail.com]
> *Sent:* Tuesday, 29 December 2009 12:24 AM
>
> *To:* Simon Horne
> *Cc:* h323plus at lists.packetizer.com
> *Subject:* Re: [h323plus] Valid sessionID in OpenLogicalChannel command
>
> Simon
>
> I can see following sequence of packets with sniffer:
>
> me -> T1000 : masterSlaveDetermination : terminalType 50
> T1000 -> me : masterSlaveDetermination : terminalType 50
> me -> T1000 : masterSlaveDeterminationAck : descision slave(1)
> T1000 -> me : masterSlaveDeterminationAck : descision master(0)
>
> Am I understand you right that T1000 says that he is master, however don't
> discharge master's obligations correct ?
>
> May be Assert should work only in debug? But in release in this case
> h323plus should just reject such RTP session (with incorrect sessionID) ?
>
> Igor
>
> 28 декабря 2009 г. 16:47 пользователь Simon Horne <s.horne at packetizer.com>написал:
>
>>  Igor
>>
>> The problem you are having with the Tandberg T1000 is a tandberg bug. The
>> endpoint cannot properly renegotiate the OLC on a master/slave conflict. The
>> H323plus end advises the T1000 that it is master however the T1000 ignores
>> it causing the conflict. Tandberg may have a firmware update to correct the
>> problem.
>>
>> Simon
>>
>>  ------------------------------
>>  *From:* Igor Pavlov [mailto:pavlov.ig at gmail.com]
>> *Sent:* Monday, 28 December 2009 11:07 PM
>>
>> *To:* Simon Horne
>> *Cc:* h323plus at lists.packetizer.com
>> *Subject:* Re: [h323plus] Valid sessionID in OpenLogicalChannel command
>>
>>   About H.264 plugin - actualy I have 3rd party static library for H.264
>> encoding/decoding and use H264 plugin as wrapper to connect library to
>> h323plus. I don't think anyone has interest of half working plugin without
>> static library...
>>
>> 28 декабря 2009 г. 15:57 пользователь Simon Horne <s.horne at packetizer.com
>> > написал:
>>
>>>  Igor
>>>
>>> The problem is caused by an master/slave conflict when first opening the
>>> audio channel which results in the OLC being rejected. The correct
>>> process is to renegotiate the OLC. It appears that the T1000 cannot properly
>>> renegotiate the OLC and incorrectly allocates an invalid sessionID of 0
>>> which causes the assert and behavior you highlighted.
>>>
>>> I also see you are using a modified and working H.264 plugin and have
>>> decided not to contribute any of that work back to the project. This is a
>>> pity.
>>>
>>> Simon
>>>
>>>
>>>  ------------------------------
>>> *From:* Igor Pavlov [mailto:pavlov.ig at gmail.com]
>>> *Sent:* Monday, 28 December 2009 9:46 PM
>>> *To:* Simon Horne
>>> *Cc:* h323plus at lists.packetizer.com
>>> *Subject:* Re: [h323plus] Valid sessionID in OpenLogicalChannel command
>>>
>>>   Sending log.
>>> T1000 in most cases after Reject sends OLC with sessionID=0, and in less
>>> cases send OLC with sessionID from 32 up to 53 (increase 1 after each
>>> reject).
>>>
>>>
>>> 2009/12/28 Simon Horne <s.horne at packetizer.com>
>>>
>>>>  Igor
>>>>
>>>> Session ID should never be zero. This is clearly an error coming from
>>>> the T1000 unit.
>>>>
>>>> Can you post a level 6 trace showing the condition the T1000 sends an
>>>> OLC with sessionID = 0
>>>>
>>>> Simon
>>>>
>>>>  ------------------------------
>>>> *From:* h323plus-bounces at lists.packetizer.com [mailto:
>>>> h323plus-bounces at lists.packetizer.com] *On Behalf Of *Igor Pavlov
>>>> *Sent:* Monday, 28 December 2009 8:25 PM
>>>> *To:* h323plus at lists.packetizer.com
>>>> *Subject:* [h323plus] Valid sessionID in OpenLogicalChannel command
>>>>
>>>>   Hi.
>>>>
>>>> I have problem when I reject OpenLogicalChannel (audio) while
>>>> communicating with Tandberg T1000.
>>>> In most cases Tandberg send me OpenLogicalChannel again with sessionID=0
>>>> so my application falls in assertion
>>>> in file rtp.cxx line 760 :
>>>> PAssert(id > 0 && id < 256, PInvalidParameter);
>>>>
>>>> I could not find valid value range for sessionID, but I don't like when
>>>> application crashes in this case :(
>>>> What can I do in this situation?
>>>>
>>>>
>>>> Igor Pavlov
>>>>
>>>
>>>
>>>
>>> --
>>> Игорь Павлов
>>>
>>
>>
>>
>> --
>> Игорь Павлов
>>
>
>
>
> --
> Игорь Павлов
>



-- 
Игорь Павлов
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