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メモ

WAV to GSM

# 準備
brew install sox

# 再生確認
afplay in.wav

# 変換
sox in.wav -r 8000 -c 1 out.gsm

GSM to WAV

# 準備
brew install ffmpeg

# 変換
ffmpeg -i in.gsm out.wav

# 再生確認
afplau out.wav

Asteriskの音声ファイル置き場

/var/lib/asterisk/sounds/ja/

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