How do TTY phones work?

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Tags

1. #forth
2. #impaired
3. #messages
4. #telephone
5. #device
6. #communicate
7. #speech
8. #hearing
9. #another
10. #order
11. #people
12. #required
13. #conversation
14. #listening
15. #special
16. #talking
17. #instead
18. #allowing