Starting from iOS 18.2, you can set InnoCaption as your default calling app. If you select InnoCaption as your default calling app, when you click on a phone number link, the outbound call will automatically be placed through the InnoCaption app.
To set InnoCaption as your default calling app
From your phone's home screen, tap the Settings app
Tap Apps
Tap Default Apps
Tap Calling
Select InnoCaption