IP Telephony Systems Definitions

  • I

    ILEC (incumbent local exchange carrier)

    An ILEC (incumbent local exchange carrier) is a telephone company in the U.S. that was providing local service when the Telecommunications Act of 1996 was enacted.

  • Indefeasible Right of Use (IRU)

    In telecommunications, Indefeasible Right of Use (IRU) is the effective long-term lease (temporary ownership) of a portion of the capacity of an international cable.

  • Internet Protocol

    The Internet Protocol (IP) is the method or protocol by which data is sent from one computer to another on the Internet.

  • IP PBX (private branch exchange)

    An IP PBX is a private branch exchange (telephone switching system within an enterprise) that switches calls between VoIP (voice over Internet Protocol or IP) users on local lines while allowing all users to share a certain number of external phone lines.

  • IP telephony (Internet Protocol telephony)

    IP telephony (Internet Protocol telephony) is a general term for the technologies that use the Internet Protocol's packet-switched connections to exchange voice, fax, and other forms of information that have traditionally been carried over the dedicated circuit-switched connections of the public switched telephone network (PSTN).

  • K

    keyphone (K/P or key station)

    Commonly used by a company within its private automatic branch exchange (PABX) telephone system, a keyphone (abbreviated as K/P, sometimes called a key station) is a telephone with the extra buttons and the intelligence to allow incoming calls to be transferred to other extensions.

  • L

    leased line

    A leased line is a bidirectional telephone line that has been rented for private voice, data exchange or telecommunication use.

  • long-distance carrier

    A long-distance carrier is a telephone company that provides connections between local exchanges in different geographic areas.

  • M

    Microsoft Teams

    Microsoft Teams is cloud-based team collaboration software that is part of the Office 365 suite of applications.

  • N

    National Call Fee Access (NCFA)

    In the U.K., National Call Fee Access (NCFA) is a Number Translation Service (NTS) that enables a caller that calls a non-geographic telephone number beginning with 0870 or 0871 to be charged what is known as the national call rate.

  • O

    Open Settlement Protocol (OSP)

    Open Settlement Protocol (OSP) is a client-server protocol that manages access control, accounting, usage data and inter-domain routing to make it easier for Internet service providers to support IP telephony.

  • Optivity Telephony Manager (OTM)

    Optivity Telephony Manager (OTM) is an application that provides single-point analysis, configuration, and management of telephony networks using a Web browser or graphical user interface (GUI).

  • P

    Premium Rate Service (PRS)

    In the U.K., Premium Rate Service (PRS) is a telephone service that provides recorded information or live conversation for callers similar to 1-900 number service in the U.S. Callers are charged a higher rate on their phone bill, which is then split between the service provider and the network operator who leases the PRS number to the provider.

  • private branch exchange (PBX)

    A PBX (private branch exchange) is a telephone system within an enterprise that switches calls between enterprise users on local lines while allowing all users to share a certain number of external phone lines.

  • R

    Real-Time Transport Control Protocol (RTCP)

    Real-Time Transport Control Protocol (RTCP) is a protocol that works with Real-Time Protocol (RTP) to monitor data delivery on large multicast networks, mainly for streaming media, telephony and video conferencing.

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