When all DECT phones have been subscribed, Avaya recommends that you disable any further subscriptions.

Ensure that no other copies of the configuration are open in Manager during subscription, as sending such a copy of the configuration back to the IP Office system will replace the subscriptions and require the handsets to be subscribed again. Following any handset subscription, a new copy of the configuration should always be loaded in IP Office Manager if any other configuration changes are required.