|
In telephony, call progress tones are audible tones which provide the status of call to the user. central office or a private branch exchange (PBX) to calling parties to indicate the status of phone calls. Equipment such as fax machines and modems are designed to recognise dial tones and busy tones. The ITU-T E.180 and E.182 recommendations define the technical characteristics and intended usage of some of these tones. ToneScript is a tone description format that may be used to specify the tone. ==Types== Major ones encountered by the public on a regular basis are listed in bold: *busy tone or busy signal *call waiting tone *comfort tone *conference call tone *confirmation tone *congestion tone *dial tone *disconnect tone *end of three-party service tone (three-way calling) *executive override tone *holding tone *preemption tone *queue tone *recall dial tone *record tone *recorder warning tone *reorder tone *ringback tone or ringing tone *ringtone or ringing signal *second dial tone *special dial tone *special information tone (SIT) *stutter dial tone (used as a message-waiting indicator) *waiting tone 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Call-progress tone」の詳細全文を読む スポンサード リンク
|