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PSTN Dial-in Conference cut-off around 30 seconds RRS feed

  • Question

  • I have just setup Lync dial-in conference for my customer. using a mobile phone, i can successful sign into the conference. but around 30 seconds, the system saying "I having trouble to access the system right now, pls try your call at a later time" then the line drop. any help appreciated.
    Thursday, December 22, 2011 8:16 AM

Answers

  • By default Mediationserver drops a call after 30 seconds if it does not get RTCP packets. Please check if there is a setting to enable RTCP on the gateway. You may observe that using Wireshark if traffic is not encrypted. Also logging tool would show the exact SIP flow.


    Johann Deutinger | MCITP Lync 2010 | MCTS Exchange 2010, OCS | ucblog.deutinger.de | http://twitter.com/jwdberlin
    • Marked as answer by Sharon.Shen Thursday, January 5, 2012 10:41 AM
    Wednesday, December 28, 2011 10:25 AM

All replies

  • Hi,

    can you run the wireshark on the mediation server and simulate the scenario. once the call get dropped, check the log for any possible errors.

    Also can you elaborate more on how your PSTN connectivity is configured with the Lync Server.

     


    Thamara. MCTS, MCITP Ent Admin, Specialized in U.C Voice OCS 2007 R2
    Thursday, December 22, 2011 8:29 AM
  • thanks for your prompt reply.

    we are using AudioCodes MediaGateway to integrate with MS Lync 2010. if possible, you can also do the testing,

    call +6568794328 (configured as access-number in Lync), key-in conference-id '51138#', key-in '*' then '*'again. key-in '6568794323#' and pin '65687#', after 30 seconds, the it says "I having trouble accessing the system now, pls try your call at a later time'.

    can not find the any error in eventview on Lync server. any other log i need look for? sorry for stupid question as i am new to Lync.

    thanks for your help!

    Thursday, December 22, 2011 8:46 AM
  • FE server might not show any logs and that's the reason i ask you to run the Wireshark on the Mediation server (assume that the Mediation server is collocated in FE). it'll show you since the connecting getting established till the end of the call.

    also can you double check all the Windows services related to Lync is running in FE server.

     


    Thamara. MCTS, MCITP Ent Admin, Specialized in U.C Voice OCS 2007 R2
    Thursday, December 22, 2011 8:58 AM
  • It looks like the gateway causes this issue.

    Please trace the PSTN call to dial-in conference and check session-timer and MS-Timer, maybe they are not configurated. If not, please try to configure Set-session Refresher to 1800 (30 Minutes) and MS-Refresher to 90 on your gateway. Hope it can solve you problem.


    Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.


    • Edited by Sean_Xiao Monday, December 26, 2011 7:34 AM
    • Proposed as answer by Sean_Xiao Thursday, December 29, 2011 8:45 AM
    Monday, December 26, 2011 7:34 AM
  • What kind of gateway and sip trunks are you using?
    Wednesday, December 28, 2011 8:46 AM
  • By default Mediationserver drops a call after 30 seconds if it does not get RTCP packets. Please check if there is a setting to enable RTCP on the gateway. You may observe that using Wireshark if traffic is not encrypted. Also logging tool would show the exact SIP flow.


    Johann Deutinger | MCITP Lync 2010 | MCTS Exchange 2010, OCS | ucblog.deutinger.de | http://twitter.com/jwdberlin
    • Marked as answer by Sharon.Shen Thursday, January 5, 2012 10:41 AM
    Wednesday, December 28, 2011 10:25 AM
  • I don't think that a missing session-timer refresh can cause a call dropping after 30 seconds already.
    Johann Deutinger | MCITP Lync 2010 | MCTS Exchange 2010, OCS | ucblog.deutinger.de | http://twitter.com/jwdberlin
    Thursday, December 29, 2011 10:00 AM