MWI - Signaling

Basically, the MWI-service (address type "Alert") is used for the signaling of new messages by indication of a signal at the user's telephone. This is normally the light up of a signal lamp or the indication of a message at the telephone display.

When the signaling is not transmitted to the PBX e.g. via a modem, the following protocol properties are required, depending on the protocol:

·DSS1 - MWI, ETSI ETS 300 650

·QSIG - mWIActivate and mWIDeactice, ECMA-242

·VoIP/SIP - Message Waiting Indication, RFC 3842

·VoIP/H.323 - H.450.7 "Message Waiting Indication supplementary service"

This feature depends on which PBX is used. Further information about the configuration are listed at "Hardware - Alert".