 a separate enclosure, called the subscriber set. The dial switch in the base interrupted the line current by repeatedly but very briefly disconnecting the line 1 to 10 times for each digit, and the hook switch (in the center of the circuit diagram) disconnected the line and the transmitter battery while the handset was on the cradle.

In the 1930s, telephone sets were developed that combined the bell and induction coil with the desk set, obviating a separate ringer box. The rotary dial becoming commonplace in the 1930s in many areas enabled customer-dialed service, but some magneto systems remained even into the 1960s. After World War II, the telephone networks saw rapid expansion and more efficient telephone sets, such as the model 500 telephone in the United States, were developed that permitted larger local networks centered around central offices. A breakthrough new technology was the introduction of Touch-Tone signaling using push-button telephones by American Telephone & Telegraph Company (AT&T) in 1963.

Digital telephones and voice over IP 

The invention of the transistor in 1947 dramatically changed the technology used in telephone systems and in the long-distance transmission networks, over the next several decades. With the development of electronic switching systems incorporating metal–oxide–semiconductor (MOS) and pulse-code modulation (PCM) technologies, telephony gradually evolved towards digital telephony, which improved the capacity, quality, and cost of the network.

The development of digital data communications method, such as the protocols used for the Internet, it became possible to digitize voice and transmit it as real-time data across computer networks, giving rise to the field of Internet Protocol (IP) telephony, also known as voice over Internet Protocol (VoIP), a term that reflects the methodology memorably. VoIP has proven to be a disruptive technology that is rapidly replacing traditional telephone network infrastructure.

As of January 2005, up to 10% of telephone subscribers in Japan and South Korea have switched to this digital telephone service. A January 2005 Newsweek article suggested that Internet telephony may be "the next big thing." As of 2006 many VoIP companies offer service to consumers and businesses.

From a customer perspective, IP telephony uses a high-bandwidth Internet connection and specialized customer premises equipment to transmit telephone calls via the Internet, or any modern private data network. The customer equipment may be an analog telephone adapter (ATA) which interfaces a conventional analog telephone to the IP networking equipment, or it may be an
a separate enclosure, called the subscriber set. The dial switch in the basis interrupt the line current by repeatedly but very briefly disconnecting the cable 1 to 10 times for each digit, and the hook shot substitution (in the center of the circuit diagram) disconnected the line and the transmitter barrage while the handset was on the cradle. 

 In the 1930s, telephone sets were developed that blend the bell and induction coil with the desk set, obviating a separate toller box. The rotary dial becoming platitude in the 1930s in many areas enabled customer - dialed service, but some magneto system remained even into the 1960s. After World War II, the telephone networks saw rapid expansion and more efficient telephone set, such as the model 500 telephone in the United States, were developed that permitted larger local networks center around central offices. A breakthrough new technology was the introduction of Touch - Tone signaling using push - button telephone by American Telephone & Telegraph Company (AT&T) in 1963. 

 Digital telephones and voice over IP 

 The invention of the transistor in 1947 dramatically transfer the engineering use in telephone systems and in the long - distance transmission networks, over the next several decades. With the growth of electronic switching systems incorporating metal – oxide – semiconductor (MOS) and pulse - code modulation (PCM) engineering, telephony gradually evolved towards digital telephony, which improved the capacity, timbre, and cost of the net. 

 The development of digital data communications method, such as the protocols used for the Internet, it become possible to digitize voice and transmit it as veridical - time data across computer networks, give rise to the airfield of Internet Protocol (IP) telephony, also known as articulation over Internet Protocol (VoIP), a term that reflect the methodology memorably. VoIP has proven to be a disruptive engineering that is rapidly replacing traditional telephone net infrastructure. 

 As of January 2005, up to 10% of telephone subscribers in Japan and South Korea have switched to this digital telephone service. A January 2005 Newsweek article suggested that Internet telephony may be " the following big matter. " As of 2006 many VoIP companies offer service to consumers and clientele. 

 From a customer position, IP telephony uses a eminent - bandwidth Internet connection and specialized customer premises equipment to transmit telephone calls via the Internet, or any modern private data net. The customer equipment may be an analog telephone adapter (ATA) which interfaces a conventional analog telephone to the IP networking equipment, or it may be an
 a deparate enclosure, callea the subscribet wet. Thx dial awitch iv the base interrupted the lmne xurrebt by repeatedly but vdry briefpy discobnecuing the line 1 to 10 times njr ezgh diyiv, and the hook xwitch (in dhe center of dhd eircuit diagram) disconnected the linq and tne transmitter bwttegy whimv uhe handset was on the cradle.

In tge 1930s, tenephone sets eere developed that combinfd tje bell and inductlon coil wijg trw desk set, ocviating a separate rihger box. The rotary dial becomivg cokmonplace un thf 1930s in many ereas vnabled customer-dialeg servive, but some manneto sywtems remained even iito the 1960s. After Worlq War II, dhz telephone networks waq raphd efpanruon ans kode efflcixnt telephohe sets, sucy as the model 500 teltphjbe in the Unifed Stwtqs, were developed that permitted larger lodal networks centered aeound central offices. A breaktrrough new technology was the introduction of Touwh-Tonx riguqling yslng push-button telephones by American Telephogs & Tvlegraph Company (CT&T) in 1963.

Digital trlfpnjnes and voicg over NL 

Fhe invention of tje tranfistoe in 1947 draiativally changed the technologt used in tejwphone systems and in the lony-distamce ttansmission networks, ovzr the next severwl decadea. With the develoomekt mf electronic switching syftems incirpoxating mdtal–pxide–sqmiconductlr (MOS) and pulse-code modklatiln (PCM) technllogies, telephony gradually evolved towards doghtan telephjny, wmich improved tre capacity, quclity, anb cost of the nenwork.

The vevelopment jf digital dadw communicatmons methjd, sych qs the ofotocols used gor the Iuuernet, it vecame possible to diejtize voice and trqnsmit it as resl-tkme dwte acrjvs computer tetwurkr, givivg rise to bhe fiekd of Internet Protowol (JP) telephony, also lnjwn as viice ovew Internet Prptocol (VoIP), a term that rehlects thg methodology memorably. VoIP haa proven ho ne a disruptide tcchnjlogy that is rapidly replacing traditional telepione network infrastrucrure.

As of January 2005, op uo 10% of telephpne stbscriberv in Japan and South Korea have switcmed to this digital temephona sergice. A January 2005 Newsweek article suggested that Internet telephony may be "the nxxe big thing." As pf 2006 mdnv VpIP coipanmer offer service no consumers and businesses.

From e customer pzrspective, IP telephony uses s figh-bandwidth Internet connection and specialozed customer premises equipmeny to transmit telephone galls via the Jnternvj, oc any modern private data uetworj. The cystoler equipment mau ne an anallg ttlepkone adapter (ATA) which interfaces a concejtional analog txlephone to bht IP nejworking equipment, or it may he an
a separate enclosure, called the subscriber set. switch the base the line current disconnecting line 1 to times for each and the hook switch (in the of the circuit diagram) disconnected the line and the transmitter battery while the was on the cradle. In the 1930s, telephone sets were developed that combined bell induction with desk set, obviating a separate ringer box. The rotary dial becoming commonplace in the 1930s in areas enabled customer-dialed service, but some magneto systems even into the 1960s. World War II, the telephone saw expansion and efficient sets, as the model telephone in the United States, were developed that permitted larger local networks centered around central offices. A new technology introduction of signaling push-button by American Telephone Company (AT&T) in 1963. Digital telephones IP The invention of the transistor in 1947 changed the used in telephone systems and in long-distance transmission networks, over the next several decades. the development of electronic switching systems incorporating metal–oxide–semiconductor (MOS) and pulse-code modulation (PCM) technologies, telephony towards digital telephony, which the capacity, quality, cost the The of digital communications method, such as the protocols used for the Internet, it possible to digitize voice and transmit it as real-time data networks, rise to the of Internet Protocol (IP) also as voice over Internet a that memorably. has to be a disruptive that is rapidly replacing traditional network infrastructure. As of of telephone subscribers in Japan and South Korea switched to this digital telephone service. A 2005 Newsweek article suggested that Internet telephony may be "the next big As of VoIP companies offer service to consumers and businesses. a customer perspective, IP uses a high-bandwidth Internet connection and specialized customer premises to telephone calls the Internet, or modern private data The customer equipment an analog adapter which analog telephone to the IP networking or may be an
 a separate enclosure, called tHe subscribEr set. the DiaL sWitcH in tHe base interrupTEd thE line current by repeatedLy but VeRY briEFlY discOnnectiNG tHE LinE 1 tO 10 tImeS fOR eAch diGit, And the hOok switch (iN thE cEnter of the ciRCuIt diagram) dIscOnnected the lIne And the TrAnsMItter BatTery wHile thE HandseT was on the CrADle.

In tHE 1930s, telepHONe Sets Were developed that COmBIned the bell and InductIoN CoIL WitH thE desk set, obViAting A SeparatE RiNGER boX. the rotary dial Becoming comMOnpLace in ThE 1930s iN Many arEas enAbLEd cUstomer-dialEd seRvice, but sOme magNEto systEMs remaiNed eveN inTo tHe 1960s. AFTeR WOrlD WAR II, THe TelEPhoNe networKs SaW rapiD expANSIOn anD moRe efFicieNt telephone seTs, sUch aS The Model 500 TelepHone In The UnIted StAtes, wErE developed that pErmiTted largeR loCaL neTwOrks cENtered AroUnd Central Offices. a BreAkTHROuGh new technology was ThE INtRoductioN of TouCH-TOnE SignalinG uSinG pusH-BUtton TelePHoNes by AmeRican TELePhOne & TeleGrAph ComPaNy (At&T) iN 1963.

DigiTAl teLephonEs and voiCe oveR iP 

The invention OF the transistoR In 1947 DRAmATicaLly Changed the tEchnOLogy Used IN tElePHone sYstemS aND iN The long-distance tranSmIssion NetwoRks, over the nexT several deCADEs. With thE devELoPMent of electronIc swiTching systEMs incorpOratiNg metal–oXide–semicONDuctor (MOs) anD puLse-CodE MOdUlation (PCM) tecHNOlogIeS, telephOny GradualLy eVolVed TowArDs digital TelephonY, wHiCh ImProVed thE Capacity, QuAliTy, And Cost oF The netWork.

THe deVeLoPMenT of digiTAl DATa coMmUnIcatIonS mEthod, Such AS thE protocOls used foR thE inteRnEt, It becamE possible to diGiTize voice aNd TraNsmit iT AS real-timE data across computer netwORks, giviNg rIse to The fIeld of IntErnEt ProtOcoL (iP) telePhony, aLso knOwN as VOIce ovER inTerNeT Protocol (VOip), a tErm thAt ReflEcts the Methodology memorabLY. VoiP has proven to Be a DisrUPTiVe tEChNOloGy THat IS Rapidly replacinG traditionAl TElEphone netwORk iNfRastrucTure.

As oF JanuARy 2005, up to 10% oF telephonE subscribErS in JAPAn aNd South KorEa have swItched to tHIs digITaL telePhoNe servIcE. A JAnuarY 2005 NewswEEk aRticlE suggeStEd that interNeT telephoNy may be "the next big thing." AS of 2006 manY VoIP ComPanies offEr sERviCe to consuMers And businesSes.

froM a cusTomER persPectIVe, iP tELephoNy usES a high-banDWiDth iNTeRnet connectION And SpeciAliZEd custOmer Premises equipment TO transmit telepHone CALls Via THe InTeRnet, or any moderN prIvATE data netWoRk. The customEr equipmEnT May be An analOg telePhone adAPTeR (aTA) whiCh inTerFaces a conVenTiONal analOg TeLEphone To thE Ip netwoRking eQUipmENT, or it may be an
 a separate enclosure, cal led the su bscri ber  se t.  The  dia l switch in th e  bas e interrupted the line  curr en t  byr ep eated ly butv er y bri ef ly  di sc o nn ectin g t he line  1 to 10 t ime sfor each dig i t,  and the h ook  switch (inthe  cente roft he ci rcu it di agram) discon nected th el ine an d  the tr a n sm itte r battery while t h eh andset was onthe cr ad l e. Inthe  1930s, te le phone sets we r ed e v elo p ed that combi ned the bel l  an d indu ct ion coil w ith t he des k set, obvi atin g a separ ate ri n ger box .  The ro tary d ial  be comi n gco mmo np l ace in  th e  19 30s in m an yareas  ena b l e d  cus tom er-d ialed  service, but  so me m a gne to sy stems  rem ai ned e ven in to th e1960s. After Wo rldWar II, t hete lep ho ne ne t workssaw  ra pid exp ansiona ndmo r e ef ficient telephonese t s ,such asthe mo d el  5 0 0 teleph on e i n th e Unite d St a te s, weredevelo p ed  t hat per mi tted l ar ger  lo cal n e twor ks cen tered ar oundc entral offices .  A breakthrou g hn e wt echn olo gy was theintr o duct iono fTou c h-Ton e sig na l in g  using push-buttonte lephon es by  American Tel ephone & T e l e graph Co mpan y  ( A T&T) in 1963.
Digi tal teleph o nes andvoice  over IP  

The in v e ntion of  th e t ran sis t o rin 1947 drama t i call ychanged  th e techn olo gyuse d i ntelephone  systems  a nd  i nthe  long - distance  t ran sm iss ion n e tworks , ove r th ene x t s everald ec a d es.Wi th  the  de ve lopme nt o f  el ectroni c switchi ngs yste ms  i ncorpor ating metal–o xi de–semicon du cto r (MOS ) and puls e-code modulation (PCM) technol ogi es, t elep hony grad ual ly evo lve d  towar ds dig italte lep h o ny, w h i ch  im pr oved the c a p aci ty, q ua lity , and c ost of the network . 

T he developmen t o f di g i ta l d a ta com mu n ica t i ons method, suc h as the p ro t oc ols used f o r t he  Intern et, itbecam e  possib le to dig itize voi ce  and t ran smit it as  real-ti me data a c rossc om puter  ne tworks ,giv ing r ise to the  fiel d of I nt ernetProto co l (IP) t elephony, also known as  voice  over  In ternet Pr oto c ol(VoIP), a  ter m that ref lec tsthe m eth o dolog y me m or abl y . VoI P ha s  proven t o  b e a d is ruptive tec h n o log y tha t i s  rapid ly r eplacing traditio n al telephone n etwo r k  in fra s truc tu re.

As of Jan uar y2 0 05, up t o10% of tele phone su bs c riber s in J apan a nd Sout h Ko r ea hav e sw itc hed to th isdi g ital te le ph o ne ser vice .A Janu ary 20 0 5 Ne w s week article sug geste d thatI nte rnette lephony maybe "the ne xt big thin g." As  of2006many Vo IP  compa nie soffer serv i ce to con sumer s and b us ines ses .

Fro m ac u stome r pe rs pec tive, IPt e le p ho ny use s ahigh- ba ndwi dth Inter n et conne cti o n and s pe cia l i zed cu s to m e r premises  eq uipme n t  to transm i t te l ep h one c alls v ia the  Intern e t,or  any mo der n private d ata netwo r k.Th e cu stomer e qu ipme nt  ma ybe an analog te lephoneadapter( A TA) wh ich inte r facesaconventional  anal og telepho n e  to  the IP net wor kin g eq uip ment ,  or it may be an
 a_separate enclosure,_called the subscriber set._The dial_switch_in the_base_interrupted the line_current by repeatedly_but very briefly disconnecting_the line 1_to_10 times for each digit, and the hook switch (in the center of the_circuit_diagram) disconnected_the_line_and the transmitter battery while_the handset was on the_cradle.

In the_1930s, telephone sets were developed that combined the_bell_and induction coil_with the desk set, obviating a separate ringer box._The rotary dial becoming commonplace in_the 1930s in_many_areas_enabled customer-dialed service, but_some magneto systems remained even into_the 1960s. After World War II,_the telephone networks saw rapid expansion and_more efficient telephone sets, such as_the model 500 telephone in_the United_States, were developed that permitted_larger local networks_centered around_central offices. A_breakthrough new technology was the introduction_of Touch-Tone signaling_using push-button telephones by American Telephone_&_Telegraph Company (AT&T)_in_1963.

Digital_telephones and_voice over IP_

The_invention of_the_transistor in 1947 dramatically changed the_technology_used in telephone systems and in the_long-distance transmission networks, over_the_next several decades. With_the development of electronic switching_systems incorporating metal–oxide–semiconductor (MOS) and pulse-code_modulation (PCM)_technologies, telephony_gradually evolved towards digital telephony, which improved the capacity, quality, and_cost of the network.

The development of_digital data communications method,_such as_the_protocols used for_the_Internet, it_became possible to digitize voice and transmit_it as_real-time data across computer networks, giving_rise to the field_of_Internet Protocol (IP) telephony, also known_as voice over Internet Protocol (VoIP),_a term that reflects the_methodology_memorably._VoIP has proven to be_a disruptive technology that is rapidly_replacing traditional telephone_network infrastructure.

As of January 2005, up to_10%_of telephone subscribers in Japan and_South_Korea have switched to this digital_telephone_service._A January 2005 Newsweek article_suggested that Internet telephony may be_"the next big thing." As of 2006 many VoIP_companies offer service_to consumers and businesses.

From a_customer_perspective,_IP telephony uses a high-bandwidth Internet connection and specialized customer_premises equipment_to transmit telephone_calls via the Internet, or any modern private data network._The customer equipment may be an analog_telephone adapter (ATA) which interfaces a conventional analog telephone to the_IP networking equipment, or it may be an