|
A
|
| Abbreviated Dial |
A stored number which can be dialled by entering a short code |
| ACD |
Automatic Call Distribution, a system to distribute calls evenly between a number of connecting telephones |
| ADSL |
Asymmetric Digital Subscriber Loop, a new service allowing permanent data connection and voice to SOHO style users over their existing telephone line wiring. |
| ARS |
Automatic Route Selection, a system which chooses the cheapest available network by which to dial a call |
| Automated Attendant |
A system which answers incoming calls, playing a greeting message and requesting a response which it uses to route the call to the required destination, offering the opportunity to chose an alternative destination or taking a message if the destination is busy |
|
B
|
| Basic rate interface |
2 bearer channel interface to ISDN |
| Bps |
Bits Per Second, indicating the speed of data transfer across telephone lines |
| BRI |
See Basic Rate Interface |
| Brokers Call |
One telephone making two calls and switching between them as required |
| BT |
British Telecommunications PLC |
|
C
|
| Call Barring |
A method of controlling the calls which can be made from a telephone |
| Call Divert |
A facility to re-direct an incoming call to another designated telephone |
| Call Forward |
See Call Divert |
| Call Intrude |
The ability to break into another call |
| Call Pick Up |
Allowing a telephone to answer a call ringing at another telephone |
| Call Waiting |
Signalling into a call indicating another call is trying to get through |
| Calling Line Identity |
The calling party’s number is sent to and displayed at the receiving telephone |
| Camp On |
A call waiting that will ring through when the called telephone becomes free |
| CCITT |
Committee Consultative International Telegraph et Telephone |
| CCU |
Central Control Unit of a telephone system |
| Centrex |
A system where a section of a large exchange can be rented and used as a ‘sub’ system where all telephones are extensions of the large system |
| Chain Dialling |
Dialling a sequence of memory locations stored in another memory |
| Co-ax |
Co-Axial cable, a central conductor surrounded by an insulator and metal stranded sheath |
| Conference Call |
A single call connecting more than two parties all able to talk to each other |
| COS |
Class Of Service, a set of parameters governing how a telephone can be used |
| CPC |
A Signal from the exchange to tell the receiving equipment that the calling party has cleared |
| CPU |
Central Processing Unit - the ‘brain’ of a piece of equipment |
| CRA |
Call Routing Apparatus |
| Cross Talk |
The interference by a call into other calls |
| CT2 |
Cordless Telephone 2 digital cordless telephone standard |
| CTI |
Computer-Telephone Integration, allows these devices to operate together |
