Share your experience!
Hi! When I conect my phone with another system to talk i can hear all, but i can hear all nice. And this happends since i update my phone to versions 6.0
PD: sorry for my english :S
try searching bluetooth on the search bar above. you can see lots of possible solutions to your problem,..
http://talk.sonymobile.com/t5/Xperia-C5-Ultra/Bluetooth-Problem/m-p/1077541#M452
http://talk.sonymobile.com/t5/Xperia-ray/Bluetooth-issue/m-p/122040#M1751