Microsoft small business knowledge base

Article ID: 2386553 - Last Review: April 30, 2015 - Revision: 43.0


When you try to start audio or video in a peer-to-peer (P2P) or multiparty conference in Skype for Business Online (formerly Lync Online), you experience one or more of the following symptoms:
  • The connection fails.
  • You receive an error message that resembles one of the following:
    • Your webcam is not configured or is in use.
    • Your audio device is not configured or is in use.
    • Cannot start audio/video due to network issues.
    • Network issues are affecting the quality of audio/video.
  • Certain audio and video options are unavailable.


To resolve this issue, follow these steps:
  1. If audio and video connect, but you experience poor quality, see the following article in the Microsoft Knowledge Base:
    2386655  ( ) You experience poor audio or video quality in Skype for Business Online
  2. Check the Skype for Business Admin Center to see whether audio/video capabilities are turned off for the whole domain or for the user or users who are experiencing the issue.
  3. Try using a different audio/video device on the same computer and try using the same audio/video device on a different computer. If the issue can be narrowed down to the specific audio/video device, verify that the USB Peripheral device ( is certified for use with Skype for Business Online.
  4. Run Windows/Microsoft Update and install any updates (optional or required) for your audio/video devices.
  5. Open the Control Panel and bring up the Device Manager. Look under Sound, video and game controllers for any devices that have conflicts.
  6. Verify network connections for the best experience. To do this, follow these steps:
    1. Verify that you're connected by a direct wired connection, by a virtual private network (VPN) connection, by a Wi-Fi connection, or by a direct Internet home office connection.
    2. Determine whether one or both users are roaming from one wireless access point to another wireless access point. In this situation, a delayed presence scenario may occur. In this scenario, the user may appear online but may actually be between two wireless access points.
    3. Try to reproduce the issue when both users are on a wired connection, on a VPN connection, or on a Wi-Fi connection.
  7. Reproduce the issue by using one contact or multiple contacts. To do this, follow these steps:
    1. If the issue is reproducible with only one contact, determine whether anyone else can reproduce the issue with the same contact.
    2. If the issue occurs with multiple contacts, check for commonalities among the group of contacts.
  8. Important This step doesn't apply to Office 365 dedicated subscription plans. Don't use this step to troubleshoot this issue if you have an Office 365 dedicated plan.

    Verify that the network meets the requirements for connecting to Skype for Business Online. For more information, go to the following Microsoft Knowledge Base article: 
    2409256  ( ) You can't connect to Skype for Business Online, or certain features don't work, because an on-premises firewall blocks the connection


This issue occurs if one or more of the following conditions are true:
  • Audio and video capabilities are restricted for the whole domain or for the individual user.
  • A user's audio/video device isn't working or is configured incorrectly.
  • Ports 443, 50000-59999 are blocked. Traffic to or from is blocked, or both conditions are true.
  • Network bandwidth is limited or decreased.
  • Audio drivers, video drivers, or webcam drivers are out of date.

Still need help? Go to the Office 365 Community ( website.

Applies to
  • Skype for Business Online
o365 o365a o365e o365m o365022013 o365p KB2386553
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