Aastra Telecom SIP 57I - Manual (Page 458)

Advanced Operational Features
6-20 41-001160-00, Release 2.1, Rev 04
IP Phone Administrator Guide
Advanced Operational Features
Configuring Whitelist Proxy Using the Aastra Web UI
Use the following procedure to configure the Whitelist Proxy feature using the
Aastra Web UI.
Aastra Web UI
1 Click on Advanced Settings->Global SIP->Advanced SIP Settings
2 The "Whitelist Proxy" field is disabled by default. To enable this field, check the box.
When this feature is enabled, an IP phone accepts call requests from a trusted proxy server only. The
IP phone rejects any call requests from an untrusted proxy server.
3 Click to save your changes.