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A ring tone is the sound made by a telephone to indicate an incoming call. The term, however, is most often used to refer to the customisable sounds available on mobile phones. This facility was originally provided so that people would be able to determine when their phone was ringing when in the company of other mobile phone owners.
A polyphonic ringtone is a ringtone that makes use of polyphony. Many mobile phones make use of such ringtones as options for customization by customers. The first polyphonic ringtones used sequenced recording methods such as MIDI. Such recordings specify what instrument should play a note at a given time, but the actual instrument sound is dependent upon the playback device. Later, it became possible to use digital audio recordings as ringtones. The recordings might be of music, speech, or other sounds. Mainstream music recordings used as ringtones are sometimes called "realtones" or "truetones".
In recent years, "personalized" ringback tone has become globally popular. With this feature, callers will hear an audio selection applied to the telephone line that has been previously determined by the called party. Audio selections can include music, messages, and special effects. Equipment is installed in the telephone network to enable replacement of the standard ringback tone with a personalized audio selection. The application of the personalized audio selections is accomplished with a subscriber account that can be modified through WWW, WAP, SMS or IVR user interfaces, as well as by Customer Care personnel.