Is it possible to get iPhone audio (telephone calls) from Lightning connection? Music works, but calls switch to internal or extenral speakers, not lightning (for e.g. docking station, car...)!

Question

Is it possible to get iPhone audio (telephone calls) from Lightning connection? Music works, but calls switch to internal or extenral speakers, not lightning (for e.g. docking station, car...)!
I want to get the audio out of the lightning connection (the way you get audio when you connect it to a dock). It works properly with music, but when making a telephone call, it switches to the internal speraker. You can change to the external spekers, but you cannot select another audio out. It's also possible to get the telephone audio from the analogue connection, but that's not what I want. I want telephone audio from lightning...
Would be so great if anybody has an idea

Answer 1

I must also say that the second update ruined my Lumia's battery life.
With the first (out-of-the-box) update the phone usually had 30 percent of battery after a quite hard day (e.g. more than an hour of talking via bluetooth handsfree, more than two hours of listening to the music via bluetooth, more than an hour of browsing via wifi, and reading hundreds of e-mails via two mail accounts). I never managed to discharge it after one day (e.g. 14-16 hours) of continous use, no matter how much I talked, listened and browsed.
Now, with the secod update, it discharges to 20% after 12 hours of laying still almost without use (30 mins of music, less than 15 mins of talking and nothing more), and discharges completely with the usage pattern described above.
Did the second update contain some Android code?