Modality shown as Unknown RRS feed

  • Question

  • Hi Experts,


    A few end-users from our organization logged an incident stating that Skype for Business call quality is not good (cutting out / fuzzy sometimes). when I checked the SFB Report, I noticed that the Modalities are shown as "Unknown" (instead of video, audio, instant messaging). I also noticed from the User Activity Report that the  Average Jitter Inter Arrival is highlighted with Yellow.

    Unknown means what?


    Please advise if anyone of you guys encountered or seen this and let me know if there's a way to solve the call quality issue.


    Thank you.



    Friday, March 29, 2019 5:03 AM

All replies

  • Hi,


    The JitterInterArrival is one of the conditions could be used to classify poor calls in QoE. This is the average change in delay between successive packets. Most modern VoIP software including Skype for Business can adapt to some levels of jitter through buffering. 


    Here is a blog clearly describe the AudioStream values that classify the call quality, please refer to: https://tomtalks.blog/2018/05/what-are-thresholds-for-good-and-poor-network-packet-loss-jitter-and-round-trip-time-for-unified-communications/


    When the network performance requirements aren't being met, we strongly recommend that you first work with your existing network service providers to improve your overall network performance.

    Kind regards,

    Calvin Liu

    Please remember to mark the reply as an answer if you find it is helpful. It will assist others who has similar issue. If you have feedback for TechNet Subscriber Support, contact tnsf@microsoft.com.

    Click here to learn more. Visit the dedicated forum to share, explore and talk to experts about Microsoft Teams.

    • Edited by Calvin-Liu Friday, March 29, 2019 9:23 AM
    • Proposed as answer by Calvin-Liu Monday, April 1, 2019 10:31 AM
    Friday, March 29, 2019 9:21 AM
  • Hi,


    Are there any update for this query? If the reply is helpful to you, please try to mark it as an answer, this will make answer searching in the forum easier and be beneficial to other community members as well. :)

    Kind regards, 

    Calvin Liu

    Please remember to mark the reply as an answer if you find it is helpful. It will assist others who has similar issue. If you have feedback for TechNet Subscriber Support, contact tnsf@microsoft.com.

    Click here to learn more. Visit the dedicated forum to shareexplore and talk to experts about Microsoft Teams.

    Tuesday, April 2, 2019 10:26 AM
  • Thanks Calvin for the response.

    Currently, we saw the following Error Events in the Application Event Log

    Event ID: 35

    Source: SidebySide


    Activation context generation failed for "C:\Program Files (x86)\Microsoft Office\Office16\lync.exe.Manifest".Error in manifest or policy file "C:\Program Files (x86)\Microsoft Office\Office16\UccApi.DLL" on line 1. Component identity found in manifest does not match the identity of the component requested. Reference is UccApi,processorArchitecture="AMD64",type="win32",version="". Definition is UccApi,processorArchitecture="x86",type="win32",version="". Please use sxstrace.exe for detailed diagnosis.

    Event ID: 0

    Source: Office 2016 Licensing Services


    The description for Event ID 0 from source Office 2016 Licensing Service cannot be found. Either the component that raises this event is not installed on your local computer or the installation is corrupted. You can install or repair the component on the local computer.

    If the event originated on another computer, the display information had to be saved with the event.

    The following information was included with the event:

    Subscription licensing service failed: -1073422333

    We did an Online Repair of Microsoft Office 365 ProPlus and seems to have helped but we are still monitoring. 

    Will update again once we have confirmed that it fixes the issue.

    Thursday, April 18, 2019 5:46 AM