Seriously 3cx dev and management, Who thought 4 BIT ADPCM would be acceptable? Seriously, it sounds like a chav talking. This is why most android cannot play the new format, because the minimum bit depth for most applications is 8bit. The last time I remember having to deal with 4bit audio was back in 1994. 3cx devs needs to either A) pay the license for MP3, B) put it back to the previous recording format. Seriously, standard ulaw/alaw would sound better than this crap. At least give us an option of what format to choose for those of us that don't care how much space a recording takes.