Callback (international callback)

A callback is a telephone service that allows a caller to request a return call from a busy or unavailable called party. The called party’s telephone rings, and the caller then hangs up. The telephone system then redials the caller’s number and connects the two parties. There are two types of callback services: on-demand and … Read more

Miniaturized satellite

A miniaturized satellite, also known as a microsatellite, is a satellite that is smaller and lighter in weight than a traditional satellite. These types of satellites are typically used for research or commercial purposes, and are often launched into orbit as part of a larger mission. Why are miniaturized satellites used? The miniaturization of satellites … Read more

Mobile number portability (MNP)

Mobile number portability (MNP) is the process of switching your mobile phone number from one network provider to another. This can be done either by porting your number to a new network provider, or by transferring your number to a new SIM card from a different network provider. MNP was introduced in the UK in … Read more


A landline is a phone that uses a traditional copper wire telephone line for connectivity. Landlines are also known as POTS (plain old telephone service) lines. Many people still use landlines in their homes, and businesses often have landlines for customer service or other purposes. Is a landline a home phone? Yes, a landline is … Read more


An autodialer is a computer-controlled device that automatically dials telephone numbers. Autodialers are used for a variety of purposes, including telemarketing, customer service, and debt collection. Autodialers can dial telephone numbers automatically, without the need for a human operator. This can be done by either storing a list of phone numbers in the autodialer, or … Read more

Service level

A service level is an agreement between a service provider and a customer that specifies the minimum acceptable level of service. The agreement may include a description of the service, the service levels, and the metrics by which the service levels will be measured. What does a 95% service level mean? A 95% service level … Read more

Digital signal X

A digital signal is a signal that has been encoded into a digital format. This can be done using a variety of methods, such as Pulse Code Modulation (PCM) or Delta modulation. Once the signal has been digitalized, it can be transmitted using a variety of methods, such as twisted pair cables, optical fibers, or … Read more

Common carrier

A common carrier is a person, company, or organization that transports goods or people for any member of the general public, without discrimination and often without charge. The term is most often used in reference to transportation companies, such as airlines, railroads, and trucking companies, but it can also refer to utility companies, Internet service … Read more

CPE device

A CPE device is a customer premises equipment device that is used in conjunction with a network service, such as a broadband or VoIP service. CPE devices can include routers, modems, set-top boxes, and other equipment that is required for the customer to use the service. What is the difference between CPE and router? CPE … Read more

Telephony Application Program Interface (TAPI)

The Telephony Application Program Interface (TAPI) is a Microsoft Windows API that provides computer telephony integration and enables PC-based applications to control telephony functions and to communicate with telephone systems. It was first introduced in 1992. TAPI can be used to develop applications that perform outbound and inbound telephony calls, as well as to develop … Read more