EntityQ2203289· pop 5· linked from 15 articlesHook flashSign in to savetelephone signalConnectionstelephone callEntitytelephoneEntitycomputer hardwareEntityVoice over IPEntitypublic switched telephone networkEntitymillisecondEntitytelephone exchangeEntityDual-tone multi-frequency signalingEntitybusiness telephone systemEntityconference callEntityhandsetEntitylocal loopEntityanalog telephone adapterEntitytelephone switchboardEntitypulse dialingEntitycrossbar switchEntityReed relayEntitycall waitingEntityCentrexEntityrelay logicEntityCategoriesTelephony signals