Ericsson Dialog 4187 Plus User Manual page 60

Other Useful Features
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Cancel an alarm setting
In idle state:
Press.
Press.
Your phone will automatically return to idle state.
Doorphone
The Doorphone is used to monitor the admission to your company,
i.e. you can open the doorlock from your phone.
Answering Doorphone calls
Lift the handset.
You will be in speech connection with the calling party.
Opening of the doorlock
After you have answered the Doorphone, you can open the door
by making an inquiry to the door-opener's directory number.
Press.
z
Dial the door-opener's directory number.
Please ask your system administrator for the number.
Note: You can also place the door-opener's directory
number on a programmable key.
BusinessPhone – Ericsson Dialog 4187 Plus