Kurtis Mantronix - How did you know ringtone RTTL codes

howdidy:d=4,o=5,b=125:8a#.,8g#,16p,8g,2g#.,8p,8g,8a#.,8g#,16p,8g,8g#.,8g.,
8f,g.,8f,8d#.,8c,16p,2c,16p,p,8a#.,8g#,16p,8g,2g#.,8p,8g,8a#.,8g#,16p,8g,8g
#.,8g.,8f,8g.,8d6,16p,d#6,8d.6,16p,2g,8p,8a#.,8g#,16p,8g,2g#.,8p,8g,8a#.,8g
#,16p,8g,8g#.,8g.,8f,g.,8f,8d#.,8c,16p,2c,16p,p,8a#.,8g#,16p,8g,2g#.,8p,8g,
8a#.,8g#,16p,8g,8g#.,8g.,8f,8g.,8d6,16p,d#6,8d.6,16p,2g