The advantage is that I would start Zoiper app only when I want to make a call.
And it would not have to run in the background and consume battery and data all the time.
I was not able to find a option which would allow this. When I try to kill Zoiper it starts again even if I do not need the app.
For now the only solution I have find out is to uninstall Zoiper and use CSIPSimple which does have this option. "outgoing calls only"
Is there any other option?
Even If I choose Config -> Exit, Zoiper still runs on the background