User guide

Key Extensions62
Forum Phone 515 / 525 / 535: Extensions and Accessories
Key Extensions
Up to three key extensions can be connected to system tele-
phones: either three key extensions of the model Forum 500 Key-
pad Paper FP 525 / 535 or three key extensions of the model
Forum 500 Keypad Display FP 535. A combination of these key
extensions is, however, not possible.
The following equipment combinations are possible:
The number of key extensions connected to a system telephone
(up to three) can be set in the Configurator of the Forum 523/
524’s Web Console (in the menu Telephony: Ports: Upn or
Telephony: Devices: VoIP Phones). Here the keys can also be
programmed as call keys or assigned functions or destination call
numbers. Users can change this programming as required.
The maximum distance between the connecting socket that the
telephone/key extension device combination is operating through
and the Forum 523/524 must be less than 1000 metres. You will
need a plug-in power supply unit no. 90035810 to provide power.
Key
extension …
… with the features connectable to a
system telephone
Forum 500
Keypad Paper
FP 525 / 535
–36keys with LED
indicator
– Labelling on label
strips
– Forum Phone 525
– Forum IPhone 525
– Forum Phone 535
– Forum IPhone 535
Forum 500
Keypad Display
FP 535
–20keys with LED indi-
cator
–3keys with LED indi-
cator to shift levels;
enables programming of
60 storage locations on
each key extension
– Labelling of the keys
over the display; each
key is assigned to a dis-
play line
– Forum Phone 535
– Forum IPhone 535