SET RINGTONES "Steam Whistle=tones/swhistle.wav,Car Horn=tones/chorn.wav,Siren=tones/siren.wav"
if the wav files are in the tones directory. If they are in the main directory use
SET RINGTONES "Steam Whistle=swhistle.wav,Car Horn=tchorn.wav,Siren=siren.wav"
Here is how to check that the ring tone WAV files have the proper format (G.711 u-law or A-law with 8-bit samples at 8kHz):
Analyze the wav files using the following application:
http://www.headbands.com/gspot/
Codec field should contain ALAW or MULAW
Info should have 8000Hz 64 kb/s (1 chnl)
The WAV file has incorrect format and should be converted if
Codec field is PCM Audio
Info is 8000Hz 128 kb/s (1 chnl) or 8000Hz 256kb/s (2 chnls)
Conversion can be done by on-line converter
https://g711.org/
select u-law (8Khz, Mono, u-law)