An index of all the common telecoms terms, jargon and acronyms.

Telecommunications Glossary > I


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In-Band Signalling

A method of controlling information in a telecommunications network by using tones or other signals carried within the same band or channel as the information being carried. For example, in a telephone call tones can be used to control transmission, receipt or disconnection of the call.

IAM – Initial Address Message

An SS7 signalling message that contains the address and routing information required to establish a point-to-point telephone connection.

IAD – Integrated Access Device

An access device located on the customer premises that can handle both voice and data services.

ICP – Integrated Communications Provider

A company that provides bundled communications services, including voice and data services.

IP RAN – Internet Protocol Radio Access Network

In strict sense, IP RAN means when the end-to-end system is IP based, including radio, RNC (in 3G) or the packet core (in LTE).

ISP – Internet Service Provider

An organisation that provides services for accessing, using or participating in the internet.

ILEC – Incumbent Local Exchange Carrier

This is the incumbent local phone company, which owns most of the local loops and facilities in a serving area, namely BT/Openreach.

ISDN – Integrated Services Digital Network

A switched network providing end-to-end digital connectivity for simultaneous transmission of voice and/or data over multiple multiplexed communications channels, and employing transmission and out-of-band signalling protocols that confirm to internationally-defined standards.

IoT – Internet of Things

A development in which everyday objects and applications have network connectivity allowing them to comunicate with oursleves and eachother.

IP – Internet Protocol

A network layer (Layer 3) standard for data transmission that performs addressing function and contains some control information, to allow packets to be routed through networks.


If you require any further information about any of the terms or information on our website, please call us on +44 (0)203 006 1170 or email contact@carritech.com.


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