Are you talking about Ring tone programming in config file
Alerting tone=
2,1, ; One cadence, One frequency
400,200,390,2010,0,0, ; 1000ms on, 4000ms off, 0ms on, 0ms off, 0ms on, 0ms off
400,-10,450,-10,0,0, ; 425Hz, -10dbm0, 0Hz, 0dBm0, 0Hz, 0dBm0
0,0 ; Tone in Voice is off, sine wave