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PSTN Conference calls cuts off after around 30 secs

    Pergunta

  • I have a problem with a call coming in via a Mitel 3300 then over to our Lync conferencing server (it may be on all calls as we don't have any live Lync extensions to test). The call connects ok and lets me type in the conf ID etc, but cuts off after a while (between 30-60 secs).

    The only error in the event log is that the mediation server (Mitel 3300) doesn't support comfort noise. I have enabled media bypass, disabled RTCP active calls and on hold, plus enable refer is set to false.

    Any ideas what this can be??


    http://lync2010tips.blogspot.com - ucottonk@hotmail.com - If this post has been useful please click the green arrow to the left or click 'Propose as answer'

    terça-feira, 17 de abril de 2012 16:24

Respostas

  • It's direct SIP to the Mitel 3300 PBX setup as described on the Open Interop site. I've adjusted the SIP session timer on the Mitel 3300 which seems to have resolved the issue. It was set to kill the call if it didn;t hear anything back from the other side after 60 secs. I've adjusted this to the max (9999) and I've had a call connected for 11 mins so far and it seems fine.

    Thanks for all the suggestions


    http://lync2010tips.blogspot.com - ucottonk@hotmail.com - If this post has been useful please click the green arrow to the left or click 'Propose as answer'

    • Marcado como Resposta tomcotton quarta-feira, 18 de abril de 2012 11:23
    quarta-feira, 18 de abril de 2012 11:23

Todas as Respostas

  • This is information coming directly from the Open Interop site  @ Microsoft

    Configuration Notes:

    1. On Lync Mediation Server, Enable Media Bypass and Disable REFER and RTCP. Testing determined that Mitel does not support REFER and RTCP.

    Known Limitations:

    1. When a Mitel user calls a Lync user, there is no ring back tone provided for the Mitel user. Mitel is investigating adding RFC 3960 support in the future.
    2. Mitel does not support comfort noise. As a result, comfort noise is not played on Microsoft Lync.

    http://technet.microsoft.com/en-us/lync/gg131938.aspx

    You should look at the SIP Messages as you will not find any info in the Event Logs.
    Please use OCSLogger.exe and snooper to look at SIP Messages coming into the Lync Server


    - Belgian Unified Communications Community : http://www.pro-lync.be -




    terça-feira, 17 de abril de 2012 23:00
  • Any ideas what this can be?

    Something is wrong, that's why the call is disconnected.

    You are not providing too many details, to give you any ideas "what possibly could be wrong".

    Is it a "direct SIP" connection or are you using a gateway?
    Have you tried running a packet capture on the Mediation server and analyzing the SIP dialog? Who initiates the disconnect?
    Consider running a S4/SIPStack/Mediation Lync component tracing and analyzing those using snooper.
    If you have QoE server setup, try checking the monitoring server reports for the disconnected calls? Very often it contains the cause why the particular call has failed or was disconnected.

    In my experience, most often calls would disconnect in 30 seconds when
    - RTCP timers fails
    - SIP dialog is not established properly, like missing/lost ACK, causing call tear down upon a timer expiry

    quarta-feira, 18 de abril de 2012 02:12
  • Hi,

    Please try to run snooper to get detailed messages first.

    Microsoft Lync Server 2010 Resource Kit Tool Snooper

    http://blogs.technet.com/b/drrez/archive/2011/01/17/microsoft-lync-server-2010-resource-kit-tool-snooper.aspx

    Another case just for your reference:

    http://social.technet.microsoft.com/Forums/pl-PL/ocsvoice/thread/540f1012-1714-4db4-bd6d-0e1a96673b20

    Regards,

    Kent

    quarta-feira, 18 de abril de 2012 06:25
  • It's direct SIP to the Mitel 3300 PBX setup as described on the Open Interop site. I've adjusted the SIP session timer on the Mitel 3300 which seems to have resolved the issue. It was set to kill the call if it didn;t hear anything back from the other side after 60 secs. I've adjusted this to the max (9999) and I've had a call connected for 11 mins so far and it seems fine.

    Thanks for all the suggestions


    http://lync2010tips.blogspot.com - ucottonk@hotmail.com - If this post has been useful please click the green arrow to the left or click 'Propose as answer'

    • Marcado como Resposta tomcotton quarta-feira, 18 de abril de 2012 11:23
    quarta-feira, 18 de abril de 2012 11:23