What is the difference between TDD and TTY?

Related questions

1. How do deaf people call 911?
2. How do I get TTY service on my phone?
3. What is TTY mode on my phone?
4. What does TTY mean for phone numbers?
5. What is the abbreviation for TTY?
6. What does TTY VCO mean on my phone?
7. What does TTY Full mean on a cell phone?
8. How do I call tmobile from my phone?
9. What is the use of TTY command in Unix?
10. What is TTY in Android phone?

Tags

1. #enough
2. #refer
3. #speech
4. #hearing
5. #teletype
6. #person
7. #interchangeably
8. #telecommunications
9. #understand
10. #device
11. #based
12. #acronyms
13. #equipment
14. #telephone
15. #functional
16. #amplification