Ericsson Dialog 3211 User Manual page 89

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