Въведение
Long-distancecallreferstoacalltoaspecificarea,usuallywithanareacodeorprefixthatisdifferentfromalocalcall.Long-distancecallsgenerallychargeadditionalfees,dependingonthecompanythatprovidestheservice,andareoftenaffectedbyfactorssuchasmarketcompetition.Internationalcallsarecallsconnectedtodifferentcountries,andthechargesaregenerallyhigher.Callchargesareusuallypaidbythedialingparty,unlessthereceivingpartyagreestoacceptacollectcall.
Beforedirectlong-distancecallswerelaunchedonthemarketin1951,alllong-distancecallsrequiredtheassistanceofaspeciallong-distanceoperator,evendirectdialcallsbetweenlocalexchangeoffices.Intercitycallsatthattimewereverytime-consumingandcostly,becauseeachcallhadtobehandledbyoperatorsinmultiplecities.Inaddition,thecalltimeoflong-distancecallsalsoneedstoberecordedmanuallyinordertobecharged.
Вътрешна междуградска фиксирана мрежа
Itreferstothetelephoneserviceprovidedbetweendifferent"long-distancenumber"areas,thatis,betweendifferentlocaltelephonenetworksthroughlong-distancetelephonenetworks(includingISDNnetworks).Auseronalocaltelephonenetworkcancallauseronthelocaltelephonenetworkinanotherlong-distancenumberingareabyaddingthedomesticlong-distanceprefixandlong-distanceareacode.
Fixednetworkdomesticlong-distancetelephoneservicesincludethefollowingmainbusinesstypes:
End-to-endtwo-wayvoiceservicesacrosslong-distancenumberingareas.
Факс услуги от край до край и услуги за данни със средна и ниска скорост в междуселищни номерационни зони.
Varioussupplementaryservicessuchascallforwardingacrosslong-distancenumberingareas,three-waycalling,andcallingnumberdisplay.
Theintelligentnetworkserviceacrossthelong-distancenumberingareajointlyprovidedbythelocaltelephonenetwork,long-distancenetworkandintelligentnetwork.
Базирана на ISDN услуга за номериране на дълги разстояния.
Theoperatorsoffixed-linedomesticlong-distancetelephoneservicesmustestablishtheirowndomesticlong-distancetelephonenetworkfacilities,andthetypesofdomesticlong-distancetelephoneservicesprovidedcanbepartorallofthem.Thelocaltelephonenetworkandlong-distancetelephonenetworkthroughwhichadomesticlong-distancetelephoneserviceisprovidedcanbethenetworkofthesameoperatororcanbejointlycompletedbythenetworksofdifferentoperators.
Международна междуградска фиксирана мрежа
referstointernationaltelephoneservicesprovidedthroughinternationaltelephonenetworks(includingISDNnetworks)betweencountriesorbetweencountriesandregions.AdomestictelephonenetworkusercandialatelephonenetworkuserinanothercountryorregionbydialingtheIDprefixandcountry(region)code.
Fixednetworkinternationallong-distancetelephoneservicesincludethefollowingmainbusinesstypes:
Двупосочни гласови услуги от край до край в различни страни или региони.
Факс услуги от край до край и услуги за данни със средна и ниска скорост в различни страни или региони.
Cross-countryorregionalintelligentnetworkservicesjointlyprovidedbylocaltelephonenetworks,long-distancenetworks,internationalnetworksandintelligentnetworks,suchasinternationalclosedusergroupvoiceservices.
Базирани на ISDN преносни услуги в различни страни или региони.
Theinternationalclosedusergroupvoiceserviceprovidedbytheinternationaldedicatedlinebelongstothefixednetworkinternationallong-distancetelephoneservice.
Fixednetworkinternationallong-distancetelephoneserviceoperatorsmustsetuptheirowninternationallong-distancetelephoneservicenetwork,andoperatorswithouttherighttooperateinternationalcommunicationfacilitiesservicesarenotallowedtoconstructinternationaltransmissionfacilities.Internationaltransmissionfacilitiesmustbeleasedfromoperatorswithcorrespondingoperatingrights.Thetypeofinternationallong-distancetelephoneserviceprovidedcanbepartorall.Theprovisionoffixed-lineinternationallong-distancetelephoneservicesmustgothroughaninternationalcommunicationgatewayestablishedwiththeapprovalofthestate.Thelocaltelephonenetwork,thedomesticlong-distancetelephonenetworkandtheinternationalnetworkthroughwhichaninternationallong-distancetelephoneserviceisprovidedcanbethenetworkofthesameoperator,orcanbejointlycompletedbythenetworksofdifferentoperators.