Do not assign a bridged appearance to the same X-port call appearance to any station other than those involved in the two-way hotline. It may lead to a situation where the hotline key indicates busy with a special icon because another phone is using it.

Incoming calls on hotline buttons may ring visibly and audibly. The audible status is controlled by its bridge-app setting in the Communication Manager station by using the same approach as for the regular bridged appearance keys.