public switched telephone network (pstn)
71Signaling System 7 — Signaling System #7 (SS7) is a set of telephony signaling protocols which are used to set up most of the world s public switched telephone network telephone calls. The main purpose is to set up and tear down telephone calls. Other uses include… …
72Comparison of VoIP software — VoIP software is used to conduct telephone like voice conversations across Internet Protocol (IP) based networks. VoIP stands for Voice over IP . For residential markets, VoIP phone service is often cheaper than traditional public switched… …
73H.323 — is an umbrella Recommendation from the ITU Telecommunication Standardization Sector (ITU T) that defines the protocols to provide audio visual communication sessions on any packet network.It is widely implemented by voice and videoconferencing… …
74Mobile telephony — Mobile phone tower Mobile telephony is the provision of telephone services to phones which may move around freely rather than stay fixed in one location. Mobile phones connect to a terrestrial cellular network of base stations (cell sites),… …
75North American Numbering Plan — NANPA redirects here. For other uses, see Nanpa (disambiguation). This article is about the numbering plan. For a list of area codes under the plan, see List of North American Numbering Plan area codes. The North American Numbering Plan (NANP) is …
76BT 21CN — The 21st Century Network (21CN) programme is the network transformation project of the UK telecommunications company BT Group plc. It will see the UK incumbent s telephone network move from the present AXE/System X Public Switched Telephone… …
77Caller ID — (caller identification, CID), also called calling line identification (CLID) or calling number identification (CNID) or Calling Line Identification Presentation (CLIP), is a telephone service, available in analog and digital phone systems and… …
78Cable television — CATV redirects here. For CAT5 cable, see Category 5 cable. Coaxial cable is often used to transmit cable television into a residence. Cable television is a system of providing television programs to consumers via radio frequency (RF) signals… …
79Common Channel Signaling — In telephony, Common Channel Signaling (CCS), in the US also Common Channel Interoffice Signaling (CCIS), is the transmission of signaling information (control information) on a separate channel from the data, and, more specifically, where that… …
80Time-division multiplexing — (TDM) is a type of digital or (rarely) analog multiplexing in which two or more signals or bit streams are transferred apparently simultaneously as sub channels in one communication channel, but are physically taking turns on the channel. The… …
