Topcom Butler 4812 USB VoIP
The Speaker volume for normal calls and
4.8Call Duration Indicator on the display
As soon as you press the Line key 
the call duration appears on the display (minutes- seconds).
E.g. “ 01:20 “ for 1 minute and 20 seconds.
The call duration remains visible on the display for 5 seconds after each call.
4.9Turning off the microphone (mute)
It is possible to turn off the microphone during a call by pressing the Delete/Mute key 
. Now you can speak freely without the caller being able to hear you.
•You are on the phone. The Line/Charge indicator 
(LED) on the base unit will blink and the Call symbol 
appears on the display.
•Press the Delete/Mute key 
to turn off the microphone.
•The symbol ‘X’ appears on the display (
).
•When you want to resume the conversation, press the Delete/Mute key 
again.
•The symbol ‘X’ disappears from the display (
). The person on the other end of the line can hear you again.
4.10 Pause key
If you dial a telephone number and you would like to add a pause to this number, press the Pause key 
at the desired place in the number.
When you call this number, this pause (3 seconds) is automatically included.
4.11 Conference call (two internal DECT handsets and one external caller)
You can have a telephone conversation with one internal and one external caller at the same time.
•While on the line with an external caller, press the INT key 
twice.
•The external call is now on hold.
•‘INT‘ appears on the display.
•Dial the number of the handset you would like to include in the call.
•Once the handset dialled is answered, keep the ‘#’ key pressed for 3 seconds.
•‘CONFERENCE’ appears on the display.
•Now you are connected to one external and one internal caller (conference call).
4.12 Locating a misplaced handset (paging)
If you cannot find the handset, briefly press the Paging key 
on the base unit.
All handsets subscribed with the base unit will sound a signal so you can locate the misplaced handset. To stop the signal, briefly press the Line key 
on any handset.
ENGLISH
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