Aastra Telecom SISIP 57I CT - Manual (Page 120)

Advanced Network Settings
4-54 41-001160-00, Rev 01 Release 2.0
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 For information about enabling/disabling “MAC Address” and “Line Number” in REGISTER
Messages, see
Chapter 6, “Advanced IP Phone Operational Features” .
5 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.