Comcast Business Trunks terms overview

Updated 1/4/2019 6:49:06 PM by Comcast Expert


Find out what some of the most commonly used Business Trunks terms mean for you and your service.


  • ALI – Automatic Location Information -- An enhanced electronic location system that automatically relays a caller's address when they call an emergency responder service such as 911, whether they call from a mobile phone or a land line.

  • BTN – Billing Telephone Number -- To which all telephone numbers of a customer (subscriber) are charged in a consolidated telephone phone bill, instead of showing charges under each telephone number.

  • CPE – Customer Premise Equipment -- Denotes equipment located at the customer’s premises. Some equipment may be owned/operated by the customer and other equipment may be owned/ operated by the service provider.

  • CPN – Calling Party Number -- The person who (or device that) initiates a telephone call.

  • DID – Direct Inward Dialing -- Service that provides one or more trunk lines to you for connection to your PBX and allocates a range of telephone numbers to this line (or group of lines) and forwards all calls to such numbers via the trunk.

  • DNIS – Dialed Number Information Service -- Service that lets you determine which telephone number was dialed by a customer.

  • DTO – Direct Termination Overflow -- An overflow routing option enables business continuity on a local T1 or higher voice line for inbound calls if service impairment occurs or all available circuits are being used. DTO can automatically redirect calls to any telephone number.

  • G.711 – International Telecommunications Union (ITU) standard codec for Pulse Code Modulation encoding scheme with a sample rate of 8000 samples per second, 8 bits per sample, delivering a high bit rate (64 Kbps) International Telecommunications Union (ITU) standard codec. μ-Law refers to the variant of G.711 that is prevalent in North America.

  • IAD – Integrated Access Device PBX -- A customer premise device that provides access to wide area networks and the Internet. Specifically, it aggregates multiple channels of information including voice and data across a single shared access link to a carrier or service provider PoP (Point of Presence). The access link may be a T1 line, a DSL connection, a cable (CATV) network, a broadband wireless link, or a metro-Ethernet connection.

  • IP – Internet Protocol -- the principal communications protocol in the Internet protocol suite for relaying datagrams across network boundaries. Its routing function enables internetworking, and essentially establishes the Internet.

  • ISDN – Integrated Services Digital Network -- A network technology that supports digital transfer of simultaneous voice and data traffic.

  • NPA – Number Plan Area -- Area code portion of TN

  • PBX – Private Branch Exchange -- A telephone exchange that serves a particular business or office, as opposed to one that a common carrier or telephone company operates for many businesses or for the general public.

  • POC – Point of Contact

  • PRI – Primary Rate Interface -- A standardized telecommunications service level within the Integrated Services Digital Network (ISDN) specification for carrying multiple DS0 voice and data transmissions between a network and a user.

  • QoS – Quality of Service

  • REN – Ring Equivalent Number -- The limit set by the phone manufacturer for the number of phones connected simultaneously per line. This number is found on the bottom of most phone equipment.

  • SIP – Session Initiated Protocol -- A signaling communications protocol, widely used for controlling multimedia communication sessions such as voice and video calls over Internet Protocol (IP) networks.

  • TN – Telephone Number

  • UPS – Uninterruptible Power Source / Supply -- An electrical apparatus that provides emergency power to a load when the input power source, typically mains power, fails. A UPS is typically used to protect hardware such as computers, data centers, telecommunication equipment or other electrical equipment where an unexpected power disruption could cause injuries, fatalities, serious business disruption or data loss.

  • VoIP – Voice over IP -- A way to carry phone calls over an IP data network, whether on the Internet or your own internal network. A primary attraction of VoIP is its ability to help reduce expenses because telephone calls travel over the data network rather than the phone company's network.

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