I'm not sure if this is a bug or by design but if I have my 920 plugged into my car audio AUX and I take a call using the speakerphone the call audio droppes to the phone. If I take it off speakerphone the audio then comes out through my car system.
Is there some sort of setting available or can this be fixed? Call audio should always go to the line out if it is plugged in.
I think it may just be something going on differently with my iPhone microphone. I could hold a call with it going through the car audio and picking up through the phone microphone. With the Lumia the other person can't hear me when I don't have it set to speakerphone but then I can't hear them as well.
I will contact support as well.
Sometimes though a public posting gets better notice than a support ticket. Often products designers, executives and developers will silently read these things .
I don't this is a design for a phone. Any phone I have ever used with Aux allows you to connect it and use the volume to adjust the sound from the phone just like a CD. CD players that where external in the past did the same thing. You connect it turn the sound up on the player then adjust the audio. The phone doesn't... The phone audio sinks to 0 when you try to turn it up it jumps 1 then back to 0. You turn the volume up in the car while a song is playing you get nothing.
This is either a flaw with the phone or the diver for the aux sending to a car setero is not working properly. No phone make or model I have owned has ever done this.
I have the same issue with a Griffin aux cable..