RTTTL specification

<ringing-tones-text-transfer-language> :=
<name> <sep> [<defaults>] <sep> <note-command>+

<name> := <char>+ ; maximum name length 10 characters

<sep> := ":"

<defaults> := 
<def-note-duration> |
<def-note-scale> |
<def-beats> 

<def-note-duration> := "d=" <duration>

<def-note-scale> := "o=" <scale> 

<def-beats> := "b=" <beats-per-minute>

<beats-per-minute> := 25,28,...,900 ; decimal value

; If not specified, defaults are
;
; 4 = duration
; 6 = scale 
; 63 = beats-per-minute


<note-command> :=
[<duration>] <note> [<scale>] [<special-duration>] <delimiter>


<duration> :=
"1" | ; Full 1/1 note
"2" | ; 1/2 note
"4" | ; 1/4 note
"8" | ; 1/8 note
"16" | ; 1/16 note
"32" | ; 1/32 note

<note> :=
"P" | ; pause
"C" |
"C#" |
"D" |
"D#" |
"E" |
"F" |
"F#" |
"G" |
"G#" |
"A" |
"A#" |
"H" 

<scale> :=
"5" | ; Note A is 440Hz
"6" | ; Note A is 880Hz
"7" | ; Note A is 1.76 kHz
"8" ; Note A is 3.52 kHz

<special-duration> :=
"." ; Dotted note

<delimiter> := ","