Devices connectable to the exchange

Next figure demonstrates arrangement of devices belonging to exercises "TTMER26" and "TTMER33". All the measuring places (ABCD) have a digital and an IP telephone, and an analogue telephone by pairs of measuring place.

There are two devices connected to the Definity exchanges for initiation/reception of calls, their dialing numbers are: 4001 and 4002. Besides, Cisco telephones behind measuring places can be used for this purpose, too.

Device types (models):

Operation and display controls of digital and IP telephones:
Operation instructions can be found at the end of the black folder.

Operation/
Display		Implemented in
Digital T7316E		Implemented in
IP 2002		Explanation
Dial pad + +
Telephone light, Set Lamp + + Signal of an incoming call
Display + + Display of information in relating to services, calls
Softkeys, Display buttons + +
Navigation keys +
Receiver + +
Speaker, handsfree + button + +
Headset + button + +
Volume control + +
Mute button + + It serves for switching the microphone on/off during the conversation
Hold button + + A button serving for holding a call
Release button, Goodbye key + + A button serving for finishing a call or a service
Feature button (F) + After pressing it we can type the access code of a service.
In case of an IP telephone this button is a softkey.
Programmable Feature/Line keys, Memory and line buttons + + Programming in the exchange
Programming at the device: F *3
Query F *0
"Soft" service (function) buttons + Programming in the exchange
Query F *900
Indicators +

Quit key 		+

It can be seen from this table, that although the signal transmission between devices and the exchange is different, operating surfaces of devices are mostly the same.