Consider the following scenario:
You create a conferencing policy and set the IP audio/video setting to None in a Microsoft Lync Server 2010 environment.
You apply the policy to a user, and then you set the telephony mode to Enterprise Voice or PC-to-PC only.
Another user uses the Online Meeting Add-in for Microsoft Lync 2010 add-in in Outlook to send an online meeting request to the user.
The user clicks the Join Online Meeting link.
In this scenario, the following notification displays in the Meeting window:
An error occurred during the online meeting.
When the user clicks the notification, the following error message displays:
When contacting your support team, reference error ID 3110 (source ID 243).
The issue occurs because the meeting logic assumes that the user has no audio or video access if the conferencing policy is set to no IP audio/video. Therefore, the user that joins with audio is not allowed to join the meeting.
To resolve this issue, install the following cumulative update:
2514982 Description of the cumulative update for Lync 2010: November 2011
For more information about how to configure conferencing setting, visit the following Microsoft website: