Ericsson BUSINESSPHONE 250 - MANUAL 2 Manual page 71

Handset to headset
Headset
Headset with
group listening
Headset to handsfree
Headset
Handsfree to headset
Headset
CONFERENCE UNIT
ALARM
INTERFACE UNIT
Press the headset key (pre-programmed)
Press to toggle between headset with or without
group listening
Press
Press the headset key (pre-programmed)
Press the headset key (pre-programmed)
For conferences with many participants, the conference unit
enhances the speech quality. It provides full duplex and high
quality conversation possibilities.
This plug-in module is fitted into the bottom of the
telephone. It makes it possible to transfer alarm signals from
various devices via the telephone to the exchange and to a
pre-defined extension. A special circuit layout provides
maximum functional security.
To a telephone fitted with an alarm interface unit you can
connect devices such as bathroom alarms for hotel rooms,
emergency alarms for hospitals, bank security alarms and
supervision of machines.
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OPTIONAL EQUIPMENT
BusinessPhone 250 - Operator´s Console
BusinessPhone 50 - Operator´s Console