What is the tone button?

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Tags

1. #older
2. #touch
3. #slower
4. #number
5. #commonly
6. #signaling
7. #format
8. #known
9. #utilizes
10. #phones
11. #standard
12. #pulse
13. #system
14. #international
15. #frequency
16. #replaced
17. #multi
18. #button
19. #dialing
20. #dialed
21. #telephone