Call recording bitrate

I just found out setting the file format to wav49 (Settings => Voicemail Admin => General => File Format) results in voicemail files being saved in 13 kb instead of 128 kb (without noticeable loss in quality) which saves a lot of space on my server. Is this also possible for call recordings?

Advanced Settings, Call Recording Format.

I have the following options:

Which is the smallest and can I add wav49?

Found it in “WAV” instead of “wav”, same file length, only 10% the size. Thanks!