Open Communications Server Control Panel.

In the left navigation bar, click Conferencing.

Click the PIN Policy tab, click New, and then do one of the following:

• Click User policy, and then, in the New PIN Policy dialog box, type a name that describes the policy in the Name field.
  
  
• Click Site policy, click the site for which you want to create a new PIN policy, and then click OK.
  
  

To modify the default policy settings, do any of the following:

• In the Description field, type a description of the PIN policy.
  
  
• In the Minimum PIN length field, type or select the minimum PIN length that you want to allow. The default minimum length is five digits.
  
  
• In the Maximum logon attempts field, type or select the maximum number of logon attempts that you want to allow before a user is locked out. The default maximum number of attempts is three.
  
  
• Select Enable PIN expiration to cause PINs to expire after the specified number of days. Clear Enable PIN expiration to prevent PINs from expiring. By default, PINs do not expire.
  
  
• If you selected Enable PIN expiration, in the PIN expires after (days) field, type or select the number of days after which PINs expire.
  
  
• Clear Allow common patterns to allow only complex patterns of digits in PINs. Select Allow common patterns to allow common patterns of digits, such as sequential numbers and repetitive sets of numbers, in PINs. The default is to not allow common patterns.
  
  

  Important:
  It is recommended that you do not allow common patterns.

Click Commit.