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Terms that are on use on this site.

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There are 13 entries in the glossary.

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Term Definition
Packet SwitchedA form of data transmission in which data is broken into small packets that are transmitted independently and reassembled at the destination. This is in contrast with circuit-switching, traditionally used for voice telephony, in which the transmission occurs over a dedicated circuit.
PBXA PBX (Private Branch Exchange) is a private telephone switch that provides switching for an office or campus. A PBX allows telephone extensions to connect to each other as well as the outside world.
Point of Presence (POP)The physical place within a LATA where a long distance carrier or a cellular provider interfaces with the network of the local exhange carrier.
  1. The physical, electrical, or software interface through which a device gains access to a network or computer.

  2. Network access point for data entry or exit.
POTSSee Plain Old Telephone Service.
Primary Interexchange Carrier (PIC)The long distance company to which traffic is automatically routed when an end user dials 1+ a telephone number.
Primary Rate ISDN (PRI)PRI is a 4-wire 1.544 megabits per second (DS1) local switching system port that uses the B8ZS line code and the ESF framing format. PRI is available in a twenty-three B channel plus one D channel (23B + D) configuration or a twenty-four B channel (24B) configuration.
Private Branch Exchange (PBX)A private telephone switching system commonly located on the end user premises with an attendant console. The PBX is connected to a common group of lines from one or more central offices to provide service to a number of individual phones
ProxyA SIP proxy server can be stateless or stateful. A stateful proxy acts as a virtual UAS (User Agent Server) or UAC (User Agent Client).

The SIP proxy takes over call control from the terminals and serves as a central repository for address translation (name to IP address).

The SIP proxy server provides similar functionality to a gatekeeper in an H.323 environment or a softswitch in an MGCP/MEGACO environment.
PSTNPSTN stands for public switched telephone network. It represents the vast network of circuit switched equipment used by the Telephone company.
Public Safety Answering Point (PSAP)An answering location for 9-1-1 calls originating in a given area. A PSAP may be designated Primary or Secondary, which refers to the order in which calls are directed for answering. Primary PSAPs respond first; Secondary PSAPs receive calls on a transfer basis only, and generally serve as a centralized answering location for a particular type of emergency call. PSAPs are staffed by employees of Emergency Response Agencies (ERAs) such as police, fire or emergency medical agencies or by employees of a common bureau serving a group of such entities.
Public Service Commission (PSC)State regulatory agencies for utilities (including telecommunications); various state agencies have names such as Public Service Commission, Public Utility Commission, Board of Public Utilities, Public Service Board, Dept. of Telecommunications and Energy.
Public Switched Telephone Network (PSTN)

1.The worldwide voice telephone network.

2. Any common carrier network that provides circuit switching among public users.


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