Руководство Пользователя для AASTRA 9112i sip ip phone

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Advanced Network Settings
4-48
41-001129-00 Rev 09, Release 1.4.1  
IP Phone Administrator Guide
Configuring the IP Phones
.
Aastra Web UI
Step Action
1
Click on Advanced Settings->Global SIP->Advanced SIP Settings.
2
Enable the "Explicit MWI Subscription" field by checking the check box. 
(Disable this field by unchecking the check box).
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 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.
4
In the "Session Timer" field, enter the time, in seconds, that the IP phone uses to send periodic 
re-INVITE requests to keep a session alive. The proxy uses these re-INVITE requests to maintain the 
status' of the connected sessions. See RFC4028 for details.