"An error occurred during the online meeting." notification when a user tries to join an online meeting that is created in Outlook by using Lync 2010

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Symptoms

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).

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Cause

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.

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