I have two users that cannot invite outside callers (invite by phone) into a voice conference.
They get this error: "Cannot perform the selected action. This action may not be permitted by the conferencing service. Please try again. If the problem persists, please contact your system administrator"
All other OCS users do not have a problem. We are running OCS R2 on server 2008 (not R2). I have double checked their conferencing settings in OCS and tried deleting their profile from OCS and reconfiguring them. Still no luck.