Push-button telephone

10- or 12-button touch-tone telephonespush-buttonpush-button dialingpush-button telephone handsetspushbutton telephonestouch tone telephonetouch-tonetouch-tone phonetouch-tone telephonetouch-tone telephones
The push-button telephone is a telephone that has buttons or keys for dialing a telephone number, in contrast to having a rotary dial as in earlier telephone instruments.wikipedia
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Telephone

phonetelephonesLocal Telephone Service
The push-button telephone is a telephone that has buttons or keys for dialing a telephone number, in contrast to having a rotary dial as in earlier telephone instruments.
Until the 1960s dials used almost exclusively the rotary technology, which was replaced by dual-tone multi-frequency signaling (DTMF) with pushbutton telephones (A4).

Rotary dial

dialrotary telephonerotary phone
The push-button telephone is a telephone that has buttons or keys for dialing a telephone number, in contrast to having a rotary dial as in earlier telephone instruments. This use even predated the invention of the rotary dial by Almon Brown Strowger in 1891.
From the 1980s onward, the rotary dial was gradually supplanted by dual-tone multi-frequency push-button dialing, first introduced to the public at the 1962 World's Fair under the trade name "Touch-Tone".

Keypad

keyboardkeypadsnumeric keypad
Although DTMF was the driving technology implemented in push-button telephones, some telephone manufacturers used push-button keypads to generate pulse dial signaling.
Numeric keypads are found on alphanumeric keyboards and on other devices which require mainly numeric input such as calculators, push-button telephones, vending machines, ATMs, Point of Sale devices, combination locks, and digital door locks.

Dual-tone multi-frequency signaling

DTMFtouch-tonetouch tone
On 18 November 1963, after approximately three years of customer testing, the Bell System in the United States officially introduced dual-tone multi-frequency (DTMF) technology under its registered trademark Touch-Tone. On November 18, 1963, the first electronic push-button system with touch-tone dialing was commercially offered by Bell Telephone to customers in the Pittsburgh area towns of Carnegie and Greensburg, Pennsylvania, after the DTMF system had been tested for several years in multiple locations, including Greensburg. The use of tones instead of dial pulses relied heavily on technology already developed for the long line network, although the 1963 touch-tone deployment adopted a different frequency set for its dual-tone multi-frequency signaling.
DTMF was first developed in the Bell System in the United States, and became known under the trademark Touch-Tone for use in push-button telephones supplied to telephone customers, starting in 1963.

Model 500 telephone

2500500-type telephone1500
This phone, the Western Electric 1500, had only ten buttons.
In the 1960s, after the introduction of touch-tone service in November 1963 in various locations of the telephone network, the basic 500-type chassis was retrofitted with a push-button keypad, along with a new housing and faceplate, creating the model 1500 for the 10-button version and in 1968 the model 2500, having 12 keys.

Pulse dialing

dial pulsepulse diallingpulse dial
Although DTMF was the driving technology implemented in push-button telephones, some telephone manufacturers used push-button keypads to generate pulse dial signaling. Over the next few decades touch-tone service replaced traditional pulse dialing technology and it eventually became a world-wide standard for telecommunication signaling.
The Touch-Tone system used push-button telephones.

Number sign

#hashhash symbol
This led to the addition of the number sign (#, pound or diamond in this context, hash, square or gate in the UK, and octothorpe by the original engineers) and asterisk or star keys in 1969.
The symbol was introduced on the bottom right button of touch-tone keypads in 1968, but that button was not extensively used until the advent of large scale voicemail (PBX systems, etc.) in the early 1980s.

Timeline of the telephone

chronicles the developmentexistence of a transatlantic telephoneon-or-off transmission methods
Timeline of the telephone
1963, November 18: AT&T commences the first subscriber Touch-Tone service in the towns of Carnegie and Greensburg, Pennsylvania, using push-button telephones that replaced rotary dial instruments.

Mobile phone

cell phonemobilemobile phones
The push-button format is also used for all cell phones, but with out-of-band signaling of the dialed number.
Push-button telephone

Western Electric

Western Electric CompanyWestrexWestern Electric Manufacturing Company
This phone, the Western Electric 1500, had only ten buttons. Western Electric experimented as early as 1941 with methods of using mechanically activated reeds to produce two tones for each of the ten digits and by the late 1940s such technology was field-tested in a No. 5 Crossbar switching system in Pennsylvania.

Number Five Crossbar Switching System

5XB switch5XBNo. 5 Crossbar switch
Western Electric experimented as early as 1941 with methods of using mechanically activated reeds to produce two tones for each of the ten digits and by the late 1940s such technology was field-tested in a No. 5 Crossbar switching system in Pennsylvania.

Bell System

BellBell Operating CompaniesBell Telephone
On 18 November 1963, after approximately three years of customer testing, the Bell System in the United States officially introduced dual-tone multi-frequency (DTMF) technology under its registered trademark Touch-Tone.

Almon Brown Strowger

Almon B. StrowgerStrowger
This use even predated the invention of the rotary dial by Almon Brown Strowger in 1891.

Direct distance dialing

direct dialdirect distance dialdirect distance dialling
The 1951 introduction of direct distance dialing required automatic transmission of dialed numbers between distant exchanges, leading to use of inband multi-frequency signaling within the Long Lines network while individual local subscribers continued to dial using standard pulses.

In-band signaling

in-bandin-band signallinginband
The 1951 introduction of direct distance dialing required automatic transmission of dialed numbers between distant exchanges, leading to use of inband multi-frequency signaling within the Long Lines network while individual local subscribers continued to dial using standard pulses.

Multi-frequency signaling

multi-frequencyMFmultifrequency
The 1951 introduction of direct distance dialing required automatic transmission of dialed numbers between distant exchanges, leading to use of inband multi-frequency signaling within the Long Lines network while individual local subscribers continued to dial using standard pulses.

Telephone exchange names

central office nametelephone exchangetelephone exchange name
As direct distance dialing expanded to a growing number of communities, local numbers (often four, five or six digits) were extended to standardized seven-digit named exchanges.

Telephone numbering plan

Area codeCalling codearea codes
A toll call to another area code was eleven digits, including the leading 1.

AT&T Corporation

AT&TAmerican Telephone & Telegraph CompanyAmerican Telephone and Telegraph Company
In the 1950s, AT&T conducted extensive studies of product engineering and efficiency and concluded that push-button dialing was preferable to rotary dialing.

Pittsburgh

Pittsburgh, PennsylvaniaPittsburgh, PACity of Pittsburgh
On November 18, 1963, the first electronic push-button system with touch-tone dialing was commercially offered by Bell Telephone to customers in the Pittsburgh area towns of Carnegie and Greensburg, Pennsylvania, after the DTMF system had been tested for several years in multiple locations, including Greensburg.

Carnegie, Pennsylvania

CarnegieCarnegie, PACarnegie Borough
On November 18, 1963, the first electronic push-button system with touch-tone dialing was commercially offered by Bell Telephone to customers in the Pittsburgh area towns of Carnegie and Greensburg, Pennsylvania, after the DTMF system had been tested for several years in multiple locations, including Greensburg.

Greensburg, Pennsylvania

GreensburgGreensburg, PAGreensburg, Pa.
On November 18, 1963, the first electronic push-button system with touch-tone dialing was commercially offered by Bell Telephone to customers in the Pittsburgh area towns of Carnegie and Greensburg, Pennsylvania, after the DTMF system had been tested for several years in multiple locations, including Greensburg.

Pennsylvania

PACommonwealth of PennsylvaniaPa.
On November 18, 1963, the first electronic push-button system with touch-tone dialing was commercially offered by Bell Telephone to customers in the Pittsburgh area towns of Carnegie and Greensburg, Pennsylvania, after the DTMF system had been tested for several years in multiple locations, including Greensburg.

Long line (telecommunications)

long lineLong LinesLong-distance calls
The use of tones instead of dial pulses relied heavily on technology already developed for the long line network, although the 1963 touch-tone deployment adopted a different frequency set for its dual-tone multi-frequency signaling.