MWI (Message Waiting Indication) is a SIP function which allows to signal the presence of new voice and fax messages on internal VoIP end devices. Signalling is possible for all voice mail and fax boxes for which the subscriber in question is entered as user.
You can use this function with the following VoIP end devices:
Auerswald VoIP system phones and standard VoIP phones
On standard VoIP phones, the LED of a function key assigned to MWI is used for signalling (optional, see the phone manual).
If operated as a system phone, the LED of the message key is used for signalling (optional, see the phone manual).
Auerswald IP DECT phones
The symbol on the display is used for signalling on COMfortel M-100, M-200, M-210, M-300 and M-310 handsets.
The function can be configured using the Configuration Manager of the IP DECT servers COMfortel WS-400 IP or COMfortel WS-650 IP, on th page Configuration > SIP under Message waiting indication (see the IP DECT server manual).
Standard VoIP end decives of other manufacturers
Requirement for the support of the MWI function is the activated SIP convenience package / SIP convenience package brand plus enabled (optional, see Activation).
Signalling and configuration depend on the end device (see the end device manual).