Aastra Telecom 57I Manuel D’Utilisation

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Network Settings
41-001160-00, Release 2.1, Rev 04
4-43
Configuring Network and Session Initiation Protocol (SIP) Features
Configuring the IP Phones
Use the following procedure to enable/disable and configure the NTP Servers 
using the Aastra Web UI.
8
Enter the IP Address (in dotted decimal) or qualified domain name for the Time Server.
9
Press Done to save the change.
Aastra Web UI
Step Action
1
Click on Advanced Settings->Network->Advanced Network Settings.
2
Enable the "NTP Time Servers" field by checking the check box. 
(Disable this field by unchecking the box). Default is disabled.
IP Phone UI
Step Action