Ring Tone Transfer Language
（重定向自RTTTL）
Ring Tone Text Transfer Language (RTTTL) was developed by Nokia to be used to transfer ringtones to cellphone by Nokia.
The RTTTL format is a string divided into three sections: name, default value, and data.
The name section consists of a string describing the name of the ringtone. It can be no longer than 10 characters, and cannot contain a colon ":" character. (However, since the Smart Messaging specification allows names up to 15 characters in length, some applications processing RTTTL also do so.)