Aastra Telecom SIP 57I - Manual (Page 184)

Global SIP Settings
4-60 41-001160-00, Release 2.1, Rev 04
IP Phone Administrator Guide
Configuring the IP Phones
.
Aastra Web UI
Step Action
For Global configuration, click on Advanced Settings->Global SIP->Advanced SIP Settings.
1 Or for per-line configuration, click on Advanced Settings->Line N (1-9).