Two audio file formats are supported:
a) Vox audio format;
b) Wave audio format.
Requirements for wave audio format:
a) BitRate - 6000 or 8000;
b) Support only 1 Channel (Mono);
c) Field tags "RIFF", "WAVE", "fmt ", "data";
d) Supported audio codecs: "PCM", "a-law", "m-law".
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