Sorry, it was not very clear what I wrote. I can connect my phone to the unit and then have all audio from the phone on the speakers, but have no audio from the head unit on the speakers at the same time. Microphone is possible too, but I haven't installed a microphone, because I am not using that.

The media server is a small portable box which I put it under the passenger seat. It has 3TB of disk space, enough for thousands hours of video or about 10,000 audio CDs in flac format (lossless compression). If that is not enough, I can install a bigger disk.

64GB is in the head unit and used mainly for storing apps, maps and music. Still enough space for storing hundreds of CDs in mp3 format. If that is not enough, I can always play content from the media server or even download it onto the head unit.

 

Excellent job!