Honeywell HCI 300E Installation And Operation Manual page 56

Installation
You can also connect the local telephone to the HCI 300E
directly. Take the "Terminal assignment at Hometronic Voice
& Web Interface" into consideration when doing so.
Terminal assignment at Hometronic Voice & Web Interface
Terminal 1
1 GND
2 +9 V DC
Terminal 2
Line In 1
2
Phone 3
4
54
red
HTA 200 cable to telephone jack
yellow
black
Connection to telephone or answering
machine
green