When a new H.323 telephone registers with the system, the system can automatically create a new extension entry for the telephone in its configuration. It can also automatically create a new user entry for the telephone. Alternatively, if the phone registers using an extension number for which entries already exist, those entries are used so long as no other phone is already using them.

For new installations, Auto-creation can be used to ease the addition of multiple phones. The auto-create options must be disabled after installation. If Auto-creation is not used, extension and user entries need to be manually added to the configuration before attempting to install the phones.