Re: [Opalvoip-devel] OLC extendedVideo with SessionId=0 from Polycom, Opal Ack with SessionID=1 - Leading to Audio Failure

[Satya S. <ss...@fu...>]

Yes opal is acting as master. I will verify with the update and provide the
feedback.

Thanks,
-Satya


On Sun, Jul 27, 2014 at 9:40 PM, Robert Jongbloed <ro...@vo...>
wrote:

>  Apologies for the slow reply.
>
> The zero session ID occurs when OPAL is acting as H.245 master and remote
> wishes to use a master allocated session ID. I could have sworn this
> functionality was working, but obviously not. I did work when OPAL is
> acting as a slave which is a more common scenario.
>
> Anyway, I have checked in what should be a fix, can you please verify?
>
>  *Robert Jongbloed*
> OPAL/OpenH323/PTLib Architect and Co-founder.
> Commercial support at http://www.voxlucida.com.au
> *Travelling, so email responses may be slow!*
>
> On 18/07/2014 9:27 pm, Satya Sahoo wrote:
>
> Hi Robert,
>
> The H2250LogicalChannelAckParameters in src/asn/h245.asn has sessionID
> constraints set to 1..255:
> sessionID   INTEGER(1..255) OPTIONAL
>
> Due to this the OLC Ack to the extendedVideo OLC from Polycom with
> SessionID=0 is responded with sessionID=1.
> The gatekeeper between the Polycom and opal on seeing this Ack starts
> sending the audio Session 1 RTP to the new destination that was actually
> meant for the extendedVideo.
>
> Here is a hack that I applied to force setting the sessionID to a value
> other than 1, ensuring the audio continued with the original OLC Ack port.
> This hack fixes the problem. I tried changing the constraints but that
> leads to some Ack failures.
>
> +++ opal-3.14/src/h323/channels.cxx 2014-07-09 19:02:32.236630005 +0530
> @@ -563,6 +563,8 @@
>    const H245_H2250LogicalChannelParameters & openparam =
>
> open.m_forwardLogicalChannelParameters.m_multiplexParameters;
>    unsigned sessionID = openparam.m_sessionID;
> +  if(sessionID == 0)
> +      sessionID = 100;
>    param.m_sessionID = sessionID;
>
>    OnSendOpenAck(param);
>
> Thanks,
> -Satya
>
>
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