Hello Roberto,
Voyager manage signal : mail , sms , voice call, skype. Usually that enough to manage all. Problem with mount or driver or sequence can be trasmitted if you managed the action result.
GNS must be inserted into Voyager … i talked with Lunatico and they send to me a App coupon. But i’m stopped to do because some user can find this difficult to setup. Another Voyager user ask for another remote service message push that i found great.
I want to implement the Signal service for GNS and PushOver 
Notification endpoints
I’ll do it …