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Recording Audio for Asterisk | Redial
http://www.itp-redial.com/class/weekly-notes/week2-notes/recording-audio-for-asterisk#:~:text=Recording%20Audio%20for%20Asterisk%20Standards%20The%20audio%20standard,the%20most%20common%20being%20ULAW%2C%20GSM%2C%20and%20G729.
Asterisk 10 Codecs and Audio Formats - Asterisk Project ...
https://wiki.asterisk.org/wiki/display/AST/Asterisk+10+Codecs+and+Audio+Formats
Asterisk can resample between any of these sampling rates and can read/write raw 16-bit signed linear audio files from/to disk. The complete list of supported sampling rates and file format extensions is: Asterisk 10 removes the format_sln16 file format in favor of expanded support in the main format_sln file format for all sampling rates.
How To Convert Audio Files for Use With Asterisk
http://www.verterion.com/asterisk/convert-audio-files-use-asterisk/
Most recording software has the ability to record audio, then export it into the proper format that the phone system will use. For Asterisk-based systems, this depends on the CODEC you are using. 90% of the time, the g711 uLAW codec is used, which means the sound file must be an 8kHz, mono, 16-bit audio file.
Recording Audio for Asterisk | Redial
http://www.itp-redial.com/class/weekly-notes/week2-notes/recording-audio-for-asterisk
Recording Audio for Asterisk. The audio standard for most Voice over IP is 8000Hz, 16Bit, Mono. Asterisk is going to expect that all audio conforms to this standard. There are a lot of codecs that are used to compress the audio, the most common being ULAW, GSM, and G729. The PSTN will only accept ULAW or G729.
Asterisk Audio and Video Capabilities - Asterisk Project ...
https://wiki.asterisk.org/wiki/display/AST/Asterisk+Audio+and+Video+Capabilities
What wav audio file formats are supported by Asterisk MOH ...
https://community.asterisk.org/t/what-wav-audio-file-formats-are-supported-by-asterisk-moh/31792
Asterisk can handle MOH files in most of the codec formats, however, I believe the only formats supported with a WAV (RIFF) wrapper are 8 bit, mono, signed linear, 8kHz, and standard rate GSM. For GSM, I believe you have to capitalise the .WAV (and not for signed linear).
Convert WAV audio files for use in Asterisk - VoIP-Info
https://www.voip-info.org/convert-wav-audio-files-for-use-in-asterisk/
Asterisk has codecs for wav (pcm), gsm, g729, g726, and wav49, all of which can be used for Playback and Background. However, Asterisk does not understand ADPCM WAV files. To convert your WAV files to a format which Asterisk can understand, use the following command: sox foo-in.wav -r 8000 -c 1 -s -w foo-out.wav resample -ql
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