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Call drops when PSTN user is admitted to Conference RRS feed

  • Question

  • Issue:  A PSTN caller is disconnected when admitted to a SFB conference call.

     

    System:

    SIP trunk to SBC to collocated Mediation server(s) on 3 FE EE pool.

    Media Bypass is enabled.

    Refer Support set to None.

     

    Testing procedure:

    1. Call into Conf # (multiple numbers available and tested several)
    2. Caller reaches Conferencing Attendant and inputs Conf ID.
    3. Attendant asks to record name.
    4. Caller records name and presses #.
    5. Conf shows person waiting in lobby.
    6. Presenter clicks Admit.
    7. Call is disconnected.

     

    In looking at the CLS logs I do see Refers.

    The Error Code in Monitoring shows 491.

    Any ideas?

     

    Tuesday, December 13, 2016 2:07 PM

Answers

  • The issue was a Codec issue on the SBC.
    • Marked as answer by BiggJake Tuesday, December 20, 2016 5:50 PM
    Tuesday, December 20, 2016 5:50 PM

All replies

  • Hi BiggJake,

    Welcome to post in our forum.

    Would you please tell us did the issue only appear on the specific user in your environment?
    Could you please tell us more information about your PSTN connectivity, such as gateway and listening port?

    If the issue just appeared on the specific user, please try to compare user attributes in AD between the affected user and other normal users.

    For Lync server side, please make sure SFB FE server and Mediation server with the latest update.

    You can use SFB debugging tool on FE server and Mediation server to test the process of conference for further troubleshooting.
    https://www.microsoft.com/en-us/download/details.aspx?id=47263

    Hope this reply is helpful to you.


    Regards,

    Alice Wang


    Please remember to mark the replies as answers if they help.
    If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com.

    Wednesday, December 14, 2016 6:48 AM
  • It is for any conference and when from PSTN callers so not a specific user.

    I have done CLS logging and do not see errrors.  only a BYE.

    I gave the call flow above.

    Wednesday, December 14, 2016 4:48 PM
  • Hello, 

    Did you also try the Trunk Configuration settings 

    Set-CsTrunkConfiguration -RTCPActiveCalls $false -RTCPCallsOnHold $false 

    What is  the SBC that you are using in your env. 


    Linus || Please mark posts as answers/helpful if it answers your question.

    • Proposed as answer by Alice-Wang Thursday, December 15, 2016 9:39 AM
    Thursday, December 15, 2016 9:33 AM
  • Those are both set to false.

    They are Sonus SBC's.

    As a test we set up another sip trunk to a separate SBC and separate FE pool.  The conf number on that trunk works.

    All of the SfB settings are the same on the 2 pools so I am leaning towards SBC or carrier.  But I could be wrong.

    Thursday, December 15, 2016 1:56 PM
  • Hi BiggJake,

    Thanks for your response.

    Because SFB settings are the same on the 2 pools, so the issue may be caused by the configuration of your Sonus SBC, you could try to contact Sonus and check if there are any misconfigurations for SBC.


    Regards,

    Alice Wang


    Please remember to mark the replies as answers if they help.
    If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com.

    Tuesday, December 20, 2016 9:49 AM
  • The issue was a Codec issue on the SBC.
    • Marked as answer by BiggJake Tuesday, December 20, 2016 5:50 PM
    Tuesday, December 20, 2016 5:50 PM