Further to SE's comments, if you're particulary interested in the technology that's replacing H/F voice comms over the Atlantic , you can try your fav search engine to check out:
Automated Dependent Surveillance (ADS)
Future Air Navigation Systems (FANS)
Controller-Pilot Data Link Communications (CPDLC)
Oceanic Route Clearance Authorization (ORCA)
ARINC ('Aeronautical Radio Inc.')
International Society of Aeronautic Communications (SITA)
Rgds
T3