I have an iPhone 7 with iOS11.4 and an avic8000 with firmware 1.15 

i havent updated since 1.04 and before updating recently I was on a Bluetooth call where the call audio broke up and started to sound “digital” or robotic.  

Ended call and wasn’t able to get normal BT volume so I upgraded to firmware 1.15 and updated my phone software and still same issue 

music, maps, email alerts - any type of Bluetooth transmission EXCEPT a phone call is working st correct volume.  

Phone volue is definitely up.  

I’ve noticed a few threads with this issue popping up. Thank you

I have a Nex 8000  fw 1.15  with a Samsung S8+ with no probs. Does your 7 have the latest fw? I realize they are diff phones, but the common dom is the unit and fw..np probs here.

I upgraded to fw1.15 and it didn’t fix anything 

New firmware available.....v.1.20

Ver 1.20 (July, 2018 Update) Improve Apple CarPlay connectivity

maybe try that one??

I never used car play is there updates Bluetooth firmware I can download anywhere 

bluetooth is updated with the same firmware. instead of doing the full firmwareupdate just do the bluetooth upgrade in settings. same goes for the 1.15 version. after normal update, do the bluetooth update afterwards.