This button is a fixed feature key for certain endpoint types, while a being a programmable feature key for others.
A subset of the digital endpoints supporting a Message Waiting button use a programmable key for this button. These include the digital 2xxx stations. The administrator configures the station to have the Message Waiting Indicator button and lamp assigned to a specific key (button) number.
Note that even though the station type of a 2xxx IP station is 2xxx, the IP 2xxx (UNIStim) stations use fixed location buttons and indicators.
In the 39xx phones and IP sets, the Message Waiting key is programmed as a fixed hard button or a fixed soft key. For example, the Message Waiting key for 3902 is key 5 whereas for other 39xx phone it is key 16.
In the 200x phones and other sets such as 2216 and 2616, different phone buttons are assigned for different functions. You cannot assign the Message Waiting key as a fixed hard button or a soft key. For example, the 2616 phone has 16 keys that can be configured as one of the feature. The 2616 phone supports attaching one or more expansion modules to add the following:
