AASTRA 4222 Office for BusinessPhone User Guide EN - Manual (Page 89)

89 BusinessPhone – Dialog 4222 Office / Dialog 3211 & 3212
Settings
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Press to enter the programming mode. _ A Ô
Press the desired programmable key. 13
Enter the Function code for Supervision. _ A ÕÔ
Press the programmable key again. 204
Enter extension number. _ A ÕÔ
Press the programmable key again. 1
Press to select ringing character. _ A ÕÔ
Press the programmable key again.
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Press to finish programming.