Aastra 6730i Administrator's Manual page 218

Global SIP Settings
Aastra Web UI
1. For Global configuration, click on Advanced Settings->Global SIP->Advanced SIP Settings.
2. Or for per-line configuration, click on Advanced Settings->Line N.
3. 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.
4. If you enable the "Explicit MWI Subscription" field, then in the "Explicit MWI Subscription 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.
5. Enable the "MWI for BLA Account" to enable or disable a BLA configured line to send an MWI SUBSCRIBE message for the BLA account.
Notes:
• If you change the setting on this parameter, you must reboot the phone for it to take affect.
• Both the "sip explicit mwi subscription" and "sip mwi for bla account" parameters must be enabled in order for the MWI subscription for
BLA to occur.
• The MWI re-subscription for the BLA account uses the value set for the "sip explicit mwi subscription period" parameter to re-subscribe.
• Whether or not the "sip mwi for bla account" parameter is enabled, the priority for displaying MWI does not change.
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