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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.
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.
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.
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.
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.
Compression Control Protocol.
Central Control Unit. The box or cabinet housing the central equipment
which controls the telephone system.
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.
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.
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.
Customer Relations Management.
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.
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.
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.
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).
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.
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).