FreeSWITCH has mod_natvie_file module through which you can use to play already transcoded files. 

On 9 August 2016 at 16:37, Mimiko <vbvbrj@gmail.com> wrote:
Hello.

In asterisk sounds and moh a delivered as files encoded to different
codec like ulaw, alaw, gsm and so on. FS deliver sounds in .wav file
with different discretisation frequency like 8k, 16k, 32k, 48k.

If asterisk has the leg in one format, it will fetch the corresponding
file to other party not doing any decode/encode of the sound. FS needs
to encode every time into corresponding codec of the client.

Which approach is better from performance view?

--
Mimiko desu.

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