dual-tone multi-frequency dialing
11Mobile radio — This article is about professional equipment. For mobile radios used in amateur radio, see amateur radio mobile operation. Mobile radio or mobiles refer to wireless communications systems and devices which are based on radio frequencies, and… …
12List of electronics topics — Alphabetization has been neglected in some parts of this article (the b section in particular). You can help by editing it. This is a list of communications, computers, electronic circuits, fiberoptics, microelectronics, medical electronics,… …
13Special information tones — In telephony, a special information tone (SIT) is an international standard three beep signal indicating a call did not go through and usually precedes a recorded announcement explaining the problem.[1] As the SIT is well known in many countries …
14Telephone keypad — A telephone keypad is a keypad that appears on a “Touch Tone” telephone. It was standardised when the dual tone multi frequency (DTMF) system was introduced in the 1960s, and replaced the rotary dial.The contemporary keypad is laid out in a 3… …
15Number One Crossbar Switching System — The Number One Crossbar Switching System, or 1XB switch, was the primary urban local telephone exchange design used by the Bell System in the mid 20th century. Its switch fabric topology was based on the earlier urban panel switch system, which,… …
16Goertzel algorithm — The Goertzel algorithm is a digital signal processing (DSP) technique for identifying frequency components of a signal, published by Dr. Gerald Goertzel in 1958. While the general Fast Fourier transform (FFT) algorithm computes evenly across the… …
17Ringtone — For the Weird Al Yankovic song, see Ringtone (song). For the film, see Ringtone (film). A ringtone or ring tone is the sound made by a telephone to indicate an incoming call or text message. Not literally a tone, the term is most often used today …
18In-band signaling — In telecommunications, in band signaling is the sending of metadata and control information in the same band, on the same channel, as used for data.TelephoneFor example, when dialing a modern telephone, the telephone number is encoded and… …
19Telecommunications device for the deaf — Miniprint 425 TDD. The acoustic coupler on the top is for use with telephone handsets. The printer records the conversation. The specific GA and SK keys allow for speedier use of common abbreviations. A telecommunications device for the deaf… …
20Interactive voice response — IVR redirects here. For other uses, see IVR (disambiguation). Interactive voice response (IVR) is a technology that allows a computer to interact with humans through the use of voice and DTMF keypad inputs. In telecommunications, IVR allows… …
