Using an LDAP Filter to limit Active Directory results

Sometimes there are reasons to limit the number of results returned from Active Directory.
This can be done via a registry entry on the BOC TAPI Connector server.
All standard registry editing warnings apply.  If you are not familiar with safely editing the Windows registry, please engage a Microsoft professional.  For most customers this change is not necessary.

The key you will need to alter is here.
HKEY_LOCAL_MACHINE\SOFTWARE\Bridge Communications\BOCServer\LDAPSearchFilter

There are numerous tools available online to help generate a string suitable for your needs.

Here is simple one to select only users with a value in the ipPhone field.
(&(objectCategory=user)(objectClass=user)(ipPhone=*))

Here is a simple one to select only users who are Skype enabled.
(&(objectCategory=user)(objectClass=user)(msRTCSIP-UserEnabled=TRUE))