I'm trying to understand how to maximize the quality of audio delievered from my asterisk server through a 3rd-party PSTN termination to a mobile phone.<br> <br> As far as I know the codec, network quality, and original sound file are the main factors -- are there others?<br> <br> In regards to the sound file, are particular formats preferred -- i.e. RAW, GSM, WAV, MP3? Based on what I've seen so far, the sound in the GSM files provided with Asterisk are a little soft, but at least smooth. A RAW file I created after converting from MP3 and WAV, sounded raspy. Does anyone have any tips for creating the best quality voice recordings?<br> <br> If my questions are answered elsewhere, please point me in that direction.<br> Thank you!<br> <p>
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