EntityQ1049026· pop 12· linked from 42 articlesdirect inward dialSign in to savetelecommunications system which assigns an E.164 direct-dial outside telephone number to individual PBX extensions for incoming callsConnectionsVoice over IPEntityPrimary Rate InterfaceEntitytelecommunicationsEntityPDFEntitytelephone numberEntitySession Initiation ProtocolEntitygatewayEntitypublic switched telephone networkEntityTIFFEntitytelephone exchangeEntitybusiness telephone systemEntityplain old telephone serviceEntitytelephone companyEntityCaller IDEntityAT&T CorporationCompanytrunkingEntitycustomer-premises equipmentEntityDeutsche BundespostEntityInternet faxEntityIP PBXEntityCategoriesTelephone exchanges