IP Office uses message waiting indication (MWI) to set a lamp or other indication on phones when a new message has been left for the user, either in a personal voice mailbox or in a group mailbox or call back message. After the system plays the message, it turns the lamp off.
All digital and IP phones have in-built message waiting lamps. Avaya one-X® Portal for IP Office provides message waiting indication on screen.
For analog phones,
IP Office provides a variety of analog message waiting indication (MWI) methods:
51 V stepped
81 V
101 V
Line reversal
The system administrator or installer selects the MWI method using
IP Office Manager during configuration to match the properties of the analog phones.
Note:
101V signaling is only available on IP500 phone cards and expansion modules.
