Topcom BUTLER 901 COMBO Notice D'utilisation page 18

Call forwarding and internal calls
INT
4 5 6
G J M
H K N
L
I O
16
In standby mode, press the INT key and then the
1
number of the handset (1-5, select "0" for the base
station).
The handset or base station you have called will now
ring.
Press the call key or pick up the receiver on the
2
base station.
You can now talk internally.