1.2 Terms and Symbols Used
Terminology
- Line pick-up/seizure/off-hook – call start, line locked, busy.
 - Line hang-up/clear – call end, handset hang-up.
 - DTMF – dual tone multi-frequency signalling.
 - PSTN – public switched telephone network.
 - Outgoing call – 2N® Analog Vario-telephone connection made, e.g. by a pressing a button.
 - Incoming call – telephone-2N® Analog Vario connection.
 - Programming mode – 2N® Analog Vario programming mode accessible from by dialling into the intercom only.
 - Code lock – mode for entering the password for switch 1 or 2 activation using a numerical keypad.
 - Telephone mode – you can make a call, dial a number and hang up using the numerical keypad.
 - DTMF transmission during call – for outgoing calls only, numbers are tone-dialled by a numerical keypad button.
 - Button substitution – the numerical keypad can be used instead of a number pre-stored under a button memory. 
 
Manual Symbols
The following symbols and pictograms are used in the manual:
Safety
- Always abide by this information to prevent persons from injury.
 
Warning
- Always abide by this information to prevent damage to the device.
 
Caution
- Important information for system functionality.
 
Tip
- Useful information for quick and efficient functionality.
 
Note
- Routines or advice for efficient use of the device.
 
