EntityQ2174765· pop 5· linked from 35 articlesringingSign in to savesound of a telephone bellConnectionstelephone callEntitytelephoneEntityInternational Standard Book NumberEntitytelecommunicationsEntityalternating currentEntitydirect currentEntityVoice over IPEntitytheatrical propertyEntityroot mean squareEntitytelephone exchangeEntityringtoneEntityphreakingEntitybusiness telephone systemEntityplain old telephone serviceEntityblue boxEntityintercomEntityCaller IDEntityhandsetEntityringback toneEntityanalog telephone adapterEntityCategoriesPhreaking boxesTelephony signals