Let me ask my token deaf friend.
Video chatting and services similar for deaf people have definitely been around longer than FaceTime.
I remember there used to be a service where deaf people could dial a number and type what they wanted to say and a person would read it to whoever they were calling and type the responses back to the deaf person.
TTY service I believe that's what you're referring to
I mean, TTY is pretty much OG texting..
Facetime? Don't you mean Skype which beat it by years.