AASTRA 7106a for MX-ONE EN - Manual (Page 24)

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To assign your own authority level to another phone:
1. Lift the handset and press numeric key * 75 *
2. Enter authorization code and press *
3. You receive verification tone
4. Enter your own extension number and press #
5. You receive verification tone, Dial the digit or digits to get an
external line and the external number.
To change your individual authorization code:
1.
Lift the handset and press numeric keys * 74 *
2. Enter old authorization code and press *
3. Enter new authorization code and press #
4. You receive verification tone.