Open Communications Server Control Panel.

In the left navigation bar, click Conferencing.

On the Conferencing Policy tab, double-click the Global policy to open the Edit Conferencing Policy dialog box.

In the Edit Conferencing Policy dialog box, do any of the following:

• By default, the maximum meeting size is 250. To make the maximum meeting size more or less than 250, in Maximum meeting size, type the maximum number of users that you want to allow at a meeting.
  
  
• By default, users can invite anonymous users to meetings. Anonymous users are users who do not have credentials in your organization’s Active Directory Domain Services and therefore are not authenticated. To prevent users from inviting anonymous users to meetings, clear the Allow participants to invite anonymous users check box.
  
  
• By default, users are prevented from recording meetings. To allow users to record meetings, in Recording, click Enable recording, and then select or clear the Allow federated and anonymous participants to record check box, depending on your preference.
  
  
• By default, audio and video is enabled for meetings. To prevent the use of audio and/or video, in Audio/video, do one of the following:
  
  
  • To allow the use of audio but not video, click Enable IP audio.
    
    
  • To prevent the use of audio and video, click None.
    
    
• If you are enabling audio, do any of the following:
  
  
  • By default, if audio is enabled, users can dial in to meetings by using the public switched telephone network (PSTN). To prevent joining the meeting by dialing in, clear the Enable PSTN dial-in conferencing check box.
    
    
  • By default, if audio is enabled, anonymous (unauthenticated) users cannot join a meeting by using dial-out phoning. With dial-out phoning, the conference server calls the user, and the user answers the phone to join the meeting. To allow unauthenticated users to join a meeting by using dial out phoning, select the Allow anonymous participants to dial out check box.
    
    
• By default, the maximum video resolution is 640*480(VGA). To change the maximum video resolution, in Maximum video resolution allowed for conferencing, click the setting that you want to use.
  
  
• By default, data collaboration is allowed. To prevent data collaboration, in Data collaboration, click None.
  
  
• If you are allowing data collaboration, do the following:
  
  
  • By default, external users can download content. To prevent external downloads, clear the Allow federated and anonymous participants to download content check box.
    
    
  • By default, users can transfer files. To prevent file transfers, clear the Allow participants to transfer files check box.
    
    
  • By default, annotations are allowed. To prevent the use of annotations, clear the Enable annotations check box.
    
    
  • By default, polls are allowed. To prevent the use of polls, clear the Enable polls check box.
    
    
• By default, participants can schedule meetings that support application sharing. To prevent the use of application sharing, in Application sharing, click Disable application sharing.
  
  
• If you are allowing application sharing, by default, users can take control of the sharing. To prevent users from taking control, clear the Allow participants to take control check box.
  
  
• If you are allowing users to take control of the sharing, by default, external users cannot control shared applications. To allow external users to control shared applications, select the Allow federated and anonymous participants to take control check box.
  
  
• If you allow users to schedule meetings that support application sharing, by default, application and desktop sharing are both allowed. To prevent application and/or desktop sharing, do one of the following:
  
  
  • To allow application sharing but not desktop sharing, click Enable application sharing.
    
    
  • To prevent application and desktop sharing, click Disable application and desktop sharing.
    
    
• By default, peer-to-peer file transfers are allowed. To prevent peer-to-peer file transfers, clear the Enable peer-to-peer file transfer check box.
  
  
• By default, peer-to-peer recording is allowed. To prevent peer-to-peer recording, clear the Enable peer-to-peer recording check box.
  
  

Click Commit