If this function has been configured (contact your service personnel), you can turn the following functions on and off for other telephones. This feature is also known as associated service. 

Do not disturb, code: *97/#97

Call forwarding, code *11, *12, *13/#1

Locking and unlocking telephone, code *66/#66

Group ringing, code *81/#81

Leaving an advisory message, code *69/#69

Group call, code *85/#85

Reset services and functions, code #0

Control relay, code *90/#90

Night service, code *44/#44

Timed reminders, code *65

Press the key. The LED lights up 

Confirm. 

Enter the code.
 

Enter the internal number of the telephone for which you want to activate the function. 

Enter the code, such as *97 for do not disturb. 

Follow the prompts on the screen for any further input.