For IIP Office systems in a multi-site network such as a Small Community Network or Server Edition network, control of the IP Office's DECT system can be transferred to another IP Office system. This failover occurs when the master base station cannot detect its primary IP Office system, that is the IP Office system configured with an IP DECT line to it.

During failover, the specified failover IP Office system takes control and hosts the DECT extensions and users that were previously on the primary IP Office system. However, no changes to the DECT configuration or additional handset subscriptions are allowed.

The failover IP Office system can still host its own Avaya Wireless DECT system using its own IP DECT line and master base station. When that is the case, it can only support failover from another system up to its maximum capacity of DECT users including its existing native DECT users.