Asterisk cannot find soundfile file.c:824 ast_openstream_full: File for-tech-support does not exist in any format
In newer versions of Asterisk it seems to default to /usr/share/asterisk/sounds even with no specific setting in /etc/asterisk/asterisk.conf even though the normal default even in Asterisk documentation for Version 20 says /var/lib/asterisk/sounds
See an example here:
[Nov 3 23:46:02] WARNING[2197][C-00000016]: file.c:824 ast_openstream_full: File for-tech-support does not exist in any format
The file does exist in /var/lib/asterisk/sounds........
How to convert audio for Asterisk .wav format
In our example we take "sound.mp3" and convert it to .wav.
Generally Asterisk for its wave needs one audio channel (-ac 1) / mono and 8000hz (-ar 8000) instead of the standard CD/MP3 of 44100hz.
Here is the command to convert into Asterisk .wav format:
ffmpeg -i sound.mp3 -ac 1 -ar 8000 sound.wav
Errors Asterisk may give you if the format is wrong:
-- Executing [91781891@cme:3] Playback("SIP/234-000........