Mitel 6800 Series Administrator's Manual page 234

Mitel 6800 Series SIP Phone Release 4.2.0 SP2 Administrator Guide
1. For Global configuration, click on Advanced Settings->Global SIP->Advanced SIP Set-
tings.
Or for per-line configuration, click on Advanced Settings->Line N.
2. Enable the "Explicit MWI Subscription" field by checking the check box.
(Disable this field by unchecking the check box. Default is disabled).
If the IP phone has a message waiting subscription with the Service Provider, a Message
Waiting Indicator (MWI) (LED or display icon) tells the user there is a message on the IP
Phone.
3. If you enable the "Explicit MWI Subscription" field, then in the "Explicit MWI Subscrip-
tion Period" field, enter the requested duration, in seconds, before the MWI subscription
times out. The phone re-subscribes to MWI before the subscription period ends. Default
is 86400.
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