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Call Barring
This allows you to bar extension users call ing certain numbers. For Exasmple, some handests might be barred from dialling international calls, directory enquiries and premium rate telephone numbers. You can even limit access to handsets by locking unauthorised users out with a PIN number.

Call Forwarding
Also known as call diversion. By dialling a code an extension user can divert incoming calls to another destination. The destination may be another extension, a group of extensions, the operator, or an external number, for example a cellphone. Different types of diversion are usually possible, e.g. Diversion of All calls, Diversion on Busy, Diversion on no reply.

Call Management
The use of specialist software to analyse and report on call records which are output from a telephone system and recorded on computer disk. The results can identify misuse, allocate costs to departments and verify the adequacy of resources.

Call Park
A call can be parked by one user and then retrieved by another. Particularly useful when loudspeaker announcements are made, e.g. "Telephone call. Joe Smith dial 811". If Joe goes to any phone and dials 811 he will get the call that has been parked there for him.

Cat 5
Abbreviation for Category 5. Strictly speaking this is a specification for the transmission performance of a data cable. However it is commonly used to describe a building cabling system which allows the user to easily route voice and data circuits to any wall socket. It is designed to be network independent and to allow different computer and telephone systems to co-exist on the same cabling.

CCP
Compression Control Protocol.

CCU
Central Control Unit. The box or cabinet housing the central equipment which controls the telephone system.

CHAP
Challenge Handshake Authentication Protocol (a security feature), an authentication scheme used by PPP servers to validate the identity of the originator of the connection, upon connection or any time later.

CLI and CLIP
Caller Line Identification and Calling Line Identity Presentation are the functions that present the phone number of the incoming caller on your phone before you pick it up. CLI sends out your number when you make a call, and CLIP allows the person being called to see your number before they pick it up.

COLP
Connected Line Presentation. A service which provides the caller with the identity of the person he has connected to. For example you may dial 01234 567890 but that number may be diverted to another. COLP will provide you with the identity of the person you have actually connected to. The identity is typically the telephone number of the connected party. This is a paid-for service from the network provider and compatible equipment is required to make use of it.

Conferencing
The joining together of more than two telephone users in a single call. Typically a call will be established between two persons, one will then hold the call, call a third party and then press a button to join all three parties in one call.

CRM
Customer Relations Management.

CTI
Computer Telephony Integration - CTI is the linking up of your telephone system with your computer system. It can reduce both fixed and variable telephony costs and has several applications which can improve efficiency and customer service.

Custom Service Mode
Used in voicemail to indicate a service where the caller hears a menu of choices from which he can choose by pressing buttons on his phone. These choices might transfer him to an extension, group of extensions, or the operator, enable him to leave a message or listen to information, or may offer him other menus.

DC5
A signalling system used to communicate between two adjacent pieces of telecommunications equipment, for example between a telephone system and a router or multiplexer or between two co-located telephone systems. For communication over longer distances DC5 can be converted to AC15. DDI

Direct Dial In number
A phone number that directs straight to a personal extension rather than having to be routed from the operator or main telephone number.

DECT
Digital Enhanced Cordless Telecommunications - DECT is the European standard for digital cordless telephones. DECT systems are not telephone systems - they are cordless handsets with base stations connected to and dependent on your PBX (Private Branch Exchange).

Delayed Ringing
A feature often used to provide an overflow if the switchboard operator is busy or absent. Incoming calls are sent to the operator but other extensions have delayed ringing, so they will start ringing if the call is not answered after a pre-set time.

DSS
Direct Station Selector. A unit which fits alongside a telephone to turn it into an operator console. Typically containing a large number of programmable buttons which can be used to call and to indicate the status of extensions (stations).