What are the specifications of the MP3 file in the pronounciation

I'm trying to build a Alexa skill using Oxford APi. But Alexa needs a particular specification of the MP3 files, which is ::

MPEG version 2, bit rate 48 kbps, sample rate 16000 Hz.

I just want to know are the specifications provided by APi and that asked by Amazon for the skill are same or not?

And I also want to know what are the languages supported by the APi for pronounciation. I saw this link https://developer.oxforddictionaries.com/documentation/languages but can't see the same.

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