RTTTL: Ringing Tones Text Transfer Language
RTTTL stands for Ringing Tones Text Transfer Language. Along with Nokring, RTTTL is among the most popular formats for mobile phone ringtones. This format contains three (3) specific parts in order for it to be readable by ringtone softwares — name, settings, and notes.
Most of the ringtones we post here are practically in the RTTTL format.