"Ok Google" -> Use Smartphone as Telephone

Hello Guys,

I installed a Pumpkin Android Head Unit with version 4.4.4 in my old Opel Astra H.
Everything works fine so far but I have one question.

If I use the Google App trying to make a call, I always get the message "Mobilfunknetz nicht verfügbar"... Dunno exactly in english, something like "network not available". That's for sure correct like it is, because google tries to call via the integrated mobile network.
Is there a chance to use the mobile network of my connected bluetooth smartphone?

So the process should be

Speaking to my HU -> "Ok Google -> Call xyz" -> The HU passes the signal to my smartphone and I make a bluetooth call over my HU mic with the mobile network of my smartphone.

If I use the "true contacts" App everything works fine... I select a contact and I'm able to make a bluetooth call. But with a "Google Now" Search it's not possible.

Thanks for your help

Regards


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