EntityQ17118945· pop 9· linked from 59 articlesdial toneSign in to saveTelephony signal sent by a telephone exchange or private branch exchange (PBX) to a terminating device, such as a telephoneConnectionswireless communicationEntityInformation AgeEntityDual-tone multi-frequency signalingEntitybusiness telephone systemEntityringback toneEntityUnited StatesCountryEuropeEntityCanadaCountryUnited KingdomCountryAfricaEntityInternetEntityThomas EdisonEntityNikola TeslaEntitytelephoneEntityDwight D. EisenhowerPersonmobile phoneEntityCaribbeanEntitymass mediaEntityLatin AmericaEntityTim Berners-LeeEntityCategoriesTelephony signals