How to lauch app from dialer in flutter Voip calling applications - flutter

I'm using flutter call keep receiving inbound calling from flutter VoIP application, I'm trying to return a call from dialer to VoIP application (outbound calling).
How can I link calls channelled from dialer to VoIP application when desired calling account selected?

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Connectycube Flutter IOS CallKit unable to accept call when phone is locked

Steps to reproduce:
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My app deals with phone calls.I want to send an auto textmessage(sms) to the dialer when the line is busy or else user is busy or else call is in hold....Here I want to get the mobile no of the dialer to my app..Is it possible????
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