Provider setting were taken from SIP config and they are not in dialplan. I would not be able to receive call without incoming context. I expected that I will be bit easier. Maybe that I have to register my cell phone provider in SIP config (fe. register => 789:password@mycellphoneprovider.com/987 ) or just and add number in to Dialplan which should ring simultaneously. Because when I receive and pick call from extern I can still redirect it to another external number. But seem to be a lot of more difficul. Thank you for you time and advices