Key Telephone

14
Dec/050

Why the touch tone key pad differ in calculators than in the telephone?

I think the answer is "it just is". The calculator and pushbutton phone were developed independently by different companies in the 1960s. There was no reason to use the same layout, and there are some differences: the phone keypad must have a # and * key; the calculator must have a decimal point, +, -, x and divide keys.

By the way, the keypad in a calculator is not a touch tone one. Touch tone refers to the dialling method used by pushbutton phones.

Check out these deals on Key Telephone-related items and save!

Samsung Prostar 816 Plus KSU Hybrid Key Telephone System
Samsung Prostar 816 Plus KSU Hybrid Key Telephone System
US $154.99
 Toshiba EKT6520-SD Electronic Key Telephone
Toshiba EKT6520-SD Electronic Key Telephone
US $64.99
 ESI EKT - A LCD BUSINESS TELEPHONE ( 12 KEYS )
ESI EKT - A LCD BUSINESS TELEPHONE ( 12 KEYS )
US $46.00
EXECUTONE 82200 KEY TELEPHONE / 17 KEYS / EXCELLENT CONDITION
EXECUTONE 82200 KEY TELEPHONE / 17 KEYS / EXCELLENT CONDITION
US $56.00
 ESI 48 Key Digital Feature Office Telephone DFP Base Only Untested
ESI 48 Key Digital Feature Office Telephone DFP Base Only Untested
US $76.99
 Panasonic KX-NT265c Black 12 Key 1-LCD Telephone for TDA100 TDA200
Panasonic KX-NT265c Black 12 Key 1-LCD Telephone for TDA100 TDA200
US $199.95
Starplus DHS Enhanced Key Telephone
Starplus DHS Enhanced Key Telephone
US $50.00
 Starplus DHS Executive Key Telephone
Starplus DHS Executive Key Telephone
US $50.00
 Nortel Norstar Key Telephone System 3X8 NNTMH100BTD2 *FREE SHIPPING*
Nortel Norstar Key Telephone System 3X8 NNTMH100BTD2 *FREE SHIPPING*
US $499.99
Vodavi Starplus STS 3515-71 24 Button Digital Key Office Multi-Line Telephone
Vodavi Starplus STS 3515-71 24 Button Digital Key Office Multi-Line Telephone
US $220.00
 Iwatsu Omega-Phone ZT-1232/2464 KSU Key Telephone Service Unit System
Iwatsu Omega-Phone ZT-1232/2464 KSU Key Telephone Service Unit System
US $194.23
 Nitsuko TiE EK-616 Key Telephone 61650
Nitsuko TiE EK-616 Key Telephone 61650
US $39.99
Vodavi Starplus Triad 24 Button Executive Key Telephone TR9015-71 Charcoal
Vodavi Starplus Triad 24 Button Executive Key Telephone TR9015-71 Charcoal
US $12.95
 VODAVI StarPlus STS P/N 3515-71, 24 Button Digital Key Office Telephone
VODAVI StarPlus STS P/N 3515-71, 24 Button Digital Key Office Telephone
US $53.51
 Northern Telecom NT5B01 Norstar Meridian Key Telephone System
Northern Telecom NT5B01 Norstar Meridian Key Telephone System
US $145.00
(3) INFINITE 1414-62 WHITE BUSINESS TELEPHONES ~ Executive Display Key ~ VODAVI
(3) INFINITE 1414-62 WHITE BUSINESS TELEPHONES ~ Executive Display Key ~ VODAVI
US $75.00
 (5) INFINITE 1414-62 WHITE BUSINESS TELEPHONES ~ Executive Display Key / VODAVI
(5) INFINITE 1414-62 WHITE BUSINESS TELEPHONES ~ Executive Display Key / VODAVI
US $120.00
 (3) INFINITE  1414-51 BLACK BUSINESS TELEPHONES ~ Executive Display Key ~ VODAVI
(3) INFINITE  1414-51 BLACK BUSINESS TELEPHONES ~ Executive Display Key ~ VODAVI
US $75.00
Key Systems US Atlas IIE Telephone System 10-0011-4501 Powered On Untested
Key Systems US Atlas IIE Telephone System 10-0011-4501 Powered On Untested
US $99.99
 Northern Telecom 402499026 MX12X0 NT5B32 Norstar Key Telephone System NT5B40G
Northern Telecom 402499026 MX12X0 NT5B32 Norstar Key Telephone System NT5B40G
US $140.98
 Nortel Networks T24 DSS Key Indicator Module for T7316e Telephone used on System
Nortel Networks T24 DSS Key Indicator Module for T7316e Telephone used on System
US $95.00
TELRAD KEY BX EXECUTIVE TELEPHONE
TELRAD KEY BX EXECUTIVE TELEPHONE
US $24.99
 SANYO STANDARD KEY TELEPHONE SET # STN2000.BRAND NEW
SANYO STANDARD KEY TELEPHONE SET # STN2000.BRAND NEW
US $5.00
 CONTEL EXECUTONE ECX33 BUTTON EXECUTIVE KEY TELEPHONE PART NO. 2992504
CONTEL EXECUTONE ECX33 BUTTON EXECUTIVE KEY TELEPHONE PART NO. 2992504
US $49.95
Coral Digital Key Telephone Office Phone Black DKT - 2320 ( Used )
Coral Digital Key Telephone Office Phone Black DKT - 2320 ( Used )
US $40.50
 Coral Digital Key Telephone Office Phone Black DKT - 1110 ( Used )
Coral Digital Key Telephone Office Phone Black DKT - 1110 ( Used )
US $36.00
 Nortel Norstar Meridian M7324 Business Telephone with 48 key Indicator Module
Nortel Norstar Meridian M7324 Business Telephone with 48 key Indicator Module
US $40.95
Toshiba Strata DK16 Digital Key Telephone System
Toshiba Strata DK16 Digital Key Telephone System
US $.99
 Panasonic VB-44233-B 34 Key Speakerphone Telephone
Panasonic VB-44233-B 34 Key Speakerphone Telephone
US $19.99
 VODAVI StarPlus STS P/N 3515-71, 24 Button Digital Key Office Telephone, LOT(2)
VODAVI StarPlus STS P/N 3515-71, 24 Button Digital Key Office Telephone, LOT(2)
US $111.00
VODAVI StarPlus STS P/N 3515-71, 24 Button Digital Key Office Telephone, LOT(4)
VODAVI StarPlus STS P/N 3515-71, 24 Button Digital Key Office Telephone, LOT(4)
US $241.01
 Nortel/Norstar Telephone M Series Key Replacement Assorted BUTTONS
Nortel/Norstar Telephone M Series Key Replacement Assorted BUTTONS
US $34.99
 12 Qty Vodavi 24 Button Exec. Key Telephones - 8 Qty TR9015-71 & 4 Qty TR9015-8
12 Qty Vodavi 24 Button Exec. Key Telephones - 8 Qty TR9015-71 & 4 Qty TR9015-8
US $99.00
NORSTAR NT5B01 NORTHERN TELECOM MERIDIAN COMPACT KEY TELEPHONE SYSTEM 616 KSU
NORSTAR NT5B01 NORTHERN TELECOM MERIDIAN COMPACT KEY TELEPHONE SYSTEM 616 KSU
US $84.27
 Vodavi Starplus Triad 8 Button Enhanced Key Telephone TR9011-71
Vodavi Starplus Triad 8 Button Enhanced Key Telephone TR9011-71
US $29.99
 Lot (3) VODAVI STARPLUS TRIAD TR9015-71 24-Button Executive Key Telephone
Lot (3) VODAVI STARPLUS TRIAD TR9015-71 24-Button Executive Key Telephone
US $49.99
Samsung Prostar 816 Hybrid Key Telephone System Box
Samsung Prostar 816 Hybrid Key Telephone System Box
US $69.99
 NOS NITSUKO AMERICA MOD KEY DM 16 TELEPHONE SYSTEM
NOS NITSUKO AMERICA MOD KEY DM 16 TELEPHONE SYSTEM
US $29.99
 LOT OF 2*Siemens optiset E advance plus Telephone S30817-S7006-B108+KEY MODULE
LOT OF 2*Siemens optiset E advance plus Telephone S30817-S7006-B108+KEY MODULE
US $20.00
Panasonic DBS 16 Key Business Telephone
Panasonic DBS 16 Key Business Telephone
US $24.99
 ESI IVX 48 KEY H DFP DIGITAL FEATURE PHONE 48 BUTTON TELEPHONE
ESI IVX 48 KEY H DFP DIGITAL FEATURE PHONE 48 BUTTON TELEPHONE
US $89.95
 ESI IVX 24 KEY DFP DIGITAL FEATURE PHONE 24 BUTTON TELEPHONE
ESI IVX 24 KEY DFP DIGITAL FEATURE PHONE 24 BUTTON TELEPHONE
US $79.95
Norstar MX12X0 Key Telephone System W/ NT5B35 Boards
Norstar MX12X0 Key Telephone System W/ NT5B35 Boards
US $49.95
 Hytel Digital Key System Telephone Handset HYD-TS20D
Hytel Digital Key System Telephone Handset HYD-TS20D
US $18.89
 VODAVI DIGITAL STARPLUS BASIC 8L KEY TELEPHONE 1411-70
VODAVI DIGITAL STARPLUS BASIC 8L KEY TELEPHONE 1411-70
US $30.00
Nortel M12X0 NT5B32FA Key Telephone System w/3x NT5B40GA-93 Analog Trunk Cards
Nortel M12X0 NT5B32FA Key Telephone System w/3x NT5B40GA-93 Analog Trunk Cards
US $89.99
 Atlas IIE Key System US Telephone Syatem Station
Atlas IIE Key System US Telephone Syatem Station
US $.99
 Nortel NT8B40AE-03 M7324 Business Telephone with 48 key Indicator Module
Nortel NT8B40AE-03 M7324 Business Telephone with 48 key Indicator Module
US $50.50
Western Electric parts 620A key sys.; Vintage Telephone parts
Western Electric parts 620A key sys.; Vintage Telephone parts
US $55.00
 TADIRAN EKT - DKT TELEPHONE PAPER KEY LABELS
TADIRAN EKT - DKT TELEPHONE PAPER KEY LABELS
US $5.00
 VODAVI STARPLUS TRIAD TR9015 24 BUTTON KEY TELEPHONE ^
VODAVI STARPLUS TRIAD TR9015 24 BUTTON KEY TELEPHONE ^
US $30.00
Atlas 8 Line Key System Digital Telephone
Atlas 8 Line Key System Digital Telephone
US $.99
 ESI 48 KEY HDFP TELEPHONE LOT OF 50
ESI 48 KEY HDFP TELEPHONE LOT OF 50
US $3,500.00
 Atlas 8 Line Key System Telephone
Atlas 8 Line Key System Telephone
US $.99
ESI 24 KEY TELEPHONE
ESI 24 KEY TELEPHONE
US $95.00
 Executone 2513501 Enore Key Telephone System No Cards
Executone 2513501 Enore Key Telephone System No Cards
US $199.99
 VODAVI Star Plus P/N 3515-71 24 Button Digital Key Office Telephone LOT (4)
VODAVI Star Plus P/N 3515-71 24 Button Digital Key Office Telephone LOT (4)
US $.99
NEC ELECTRA 616 KEY PBX KSU PHONE TELEPHONE SYSTEM
NEC ELECTRA 616 KEY PBX KSU PHONE TELEPHONE SYSTEM
US $237.00
 Starplus Digital Phone 1411-71 Enhanced Key Telephone (have multiple quantities)
Starplus Digital Phone 1411-71 Enhanced Key Telephone (have multiple quantities)
US $2.99
 Panasonic KX-NT265 W 12 Key 1-LCD Telephone for TDA100 TDA200
Panasonic KX-NT265 W 12 Key 1-LCD Telephone for TDA100 TDA200
US $199.95
COMDIAL UNISYN TS308 KEY SYSTEM TELEPHONE USED AS DEMO
COMDIAL UNISYN TS308 KEY SYSTEM TELEPHONE USED AS DEMO
US $169.99
 Starplus 1414-17 Digital Executive Key Telephone, Base Only
Starplus 1414-17 Digital Executive Key Telephone, Base Only
US $19.99
 Starplus 1412-71 Digital Executive Key Telephone, Base Only
Starplus 1412-71 Digital Executive Key Telephone, Base Only
US $15.99
Coral Digital Key Telephone Office Phone Black DKT - 2320
Coral Digital Key Telephone Office Phone Black DKT - 2320
US $45.00
 LOT of 8 Panasonic HAC VB-44223A-G DBS 22-Key LCD Speaker Phone Telephone
LOT of 8 Panasonic HAC VB-44223A-G DBS 22-Key LCD Speaker Phone Telephone
US $199.00
 Eclipse Key Telephone Set--Basic Digital Phone # 560.4101--New in Box
Eclipse Key Telephone Set--Basic Digital Phone # 560.4101--New in Box
US $14.99
Eclipse Key Telephone Set--Professional Display Phone # 560.4301--New in Box
Eclipse Key Telephone Set--Professional Display Phone # 560.4301--New in Box
US $24.99
 Toshiba HKSU-901 Strata XXe Electronic Key Telephone System
Toshiba HKSU-901 Strata XXe Electronic Key Telephone System
US $80.00
 Iwatsu 7319 Omega ZT- ZT-24X - 24 Button Display Key Telephone
Iwatsu 7319 Omega ZT- ZT-24X - 24 Button Display Key Telephone
US $110.00
Iwatsu 7320 Omega ZT- ZT-12X - 12Button Display Key Telephone
Iwatsu 7320 Omega ZT- ZT-12X - 12Button Display Key Telephone
US $100.00
 Lot of 4 TOSHIBA DKT2010-SD LCD DIGITAL KEY TELEPHONE / SPK. OFFICE PHONE, Great
Lot of 4 TOSHIBA DKT2010-SD LCD DIGITAL KEY TELEPHONE / SPK. OFFICE PHONE, Great
US $100.00
 TOSHIBA Model EKT2204 Electronic Key Telephone
TOSHIBA Model EKT2204 Electronic Key Telephone
US $19.95
(8) ARIES DIGITAL KEY SYSTEM ADKS-144 AD0144-CBT-PAK 64-144 PBX TELEPHONE $199
(8) ARIES DIGITAL KEY SYSTEM ADKS-144 AD0144-CBT-PAK 64-144 PBX TELEPHONE $199
US $199.00
 Toshiba HKSU605C Strata Se Key Telephone System,a
Toshiba HKSU605C Strata Se Key Telephone System,a
US $50.00
 Tie UMT-32 KSU UMT-32/64 Key Telephone System COMPLETELY STOCKED
Tie UMT-32 KSU UMT-32/64 Key Telephone System COMPLETELY STOCKED
US $499.99
ESI 48-Key Digital Business Speaker Telephone LCD Business Phone Black+Handset
ESI 48-Key Digital Business Speaker Telephone LCD Business Phone Black+Handset
US $39.99
 NTB TIE EK612 KEY TELEPHONE SYSTEM CONTROL UNIT
NTB TIE EK612 KEY TELEPHONE SYSTEM CONTROL UNIT
US $110.00
 Lot of 10 Tadiran/ECI Coral DKT2120 - 440963200 - V3 Digital Key Telephone
Lot of 10 Tadiran/ECI Coral DKT2120 - 440963200 - V3 Digital Key Telephone
US $112.99
Toshiba HDSS6560 Electronic Key Telephone NEW!!
Toshiba HDSS6560 Electronic Key Telephone NEW!!
US $35.00
 Iwatsu ZT-S 616 Key Telephone System
Iwatsu ZT-S 616 Key Telephone System
US $75.00
 Telrad Digital Key BX Telephone System 4 Cards 76-110-0000
Telrad Digital Key BX Telephone System 4 Cards 76-110-0000
US $399.95
Lot of 4 CORAL DIGITAL KEY TELEPHONE DKT-2420
Lot of 4 CORAL DIGITAL KEY TELEPHONE DKT-2420
US $54.95
 Toshiba Strata DK 280 DKSUE280A Digital Key Telephone System 1*RDSU1+1*RSTU2+4*P
Toshiba Strata DK 280 DKSUE280A Digital Key Telephone System 1*RDSU1+1*RSTU2+4*P
US $135.00
 Toshiba Strata DK 280 DKSUE280A Digital Key Telephone System W/1*RDTU1+1*RSTU2
Toshiba Strata DK 280 DKSUE280A Digital Key Telephone System W/1*RDTU1+1*RSTU2
US $130.00
Toshiba EKT 6020-H 20 Button Electronic Key Telephone P
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US $79.00
 Toshiba EKT 6025-H Electronic Key Telephone that operat
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 Panasonic DBS 16 Key Business Telephone VB-42210
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Refurbished Norstar M7310 Key Telephone System Handset
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 Win Meisei MK440CT BSC Digital Key Telephone 34 Handsets 1 DSS 32D-tel MK-4400ct
Win Meisei MK440CT BSC Digital Key Telephone 34 Handsets 1 DSS 32D-tel MK-4400ct
US $850.00
 Nortel Norstar Business PBX Key Phone Telephone System
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Nortel Office Business 12-Phones Key Telephone System
Nortel Office Business 12-Phones Key Telephone System
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 Samsung Prostar 1224 Hybrid Key Telephone System Carded 4X8
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US $49.99
 Panasonic DBS VB-43220 22 Button Key Business Office Speaker Telephone Gray
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US $19.49



Lady Gaga Telephone Parody (ft Beyonce): Key of Awesome with LYRICS



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