The alert on your phone for a call would be the same as receiving a text message or an app push notification (ring + vibrate).
If you think they are easy to miss maybe you could assign a specific ringtone + volume profile for Crypto – ML app. I know that’s possible on most Android phones (config -> apps -> notifications) but I’m not sure about iOS though.

By the way that won’t be an issue anymore when they finally deploy their API integration