I've just updated to firmware 188.8.131.520 from 184.108.40.206 to give it a try. As soon as i gave a first call, i had the impression of a lower quality sound. A sound with less presence. I was using G711a in the two cases. I've reverted to 220.127.116.11 and get back the audio quality. I ask myself if this problem wouldn't be related to the new HI-Q algorythm. Aastra, please could you check audio quality on this firmware, and perhaps give a possibility to disable Hi-Q on futur firmware ?