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Custom tones can be added to the call recorder in order to obfuscate part of a call recording. Since the tones are raw byte data that replace portions of the original WAV audio stream, they must respect the codec of the original file, e.g. a-law, u-law, etc., and use the same sample size and rate, e.g. 16-bit, 8 KHz.
Since phone calls can use various codecs (dictated by both parties of a conversation) you should make your customised audio tone available in each format, using the same codecs that your phone system might use.
Once the files have been encoded accordingly, they should be copied to the following location: {app}\ProgramData\Tri-Line\Echo\tones.
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