Aastra SIP 53I Administrator's Manual page 444

IP Phone Administrator Guide
Advanced Operational Features
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Aastra Web UI
Step Action
1 Click on Advanced Settings->Global SIP->Advanced SIP Setting.
2 Enable the "Send MAC Address in REGISTER Message" field by checking the check box.
(Disable this field by unchecking the box).
3 Enable the "Send Line Number in REGISTER Message" field by checking the check box.
(Disable this field by unchecking the box).
4 Click
Note: The session prompts you to restart the IP phone to apply the configuration settings.
5 Select Operation->Reset and click
6-6
to save your settings.
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41-001160-00, Release 2.1, Rev 04