What is DTMF relay?

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Tags

1. #method
2. #transparently
3. #relayed
4. #being
5. #according
6. #tones
7. #regenerated
8. #relay
9. #multi
10. #listens
11. #mechanism
12. #negotiated
13. #rfc2833
14. #relaying
15. #common
16. #where
17. #there
18. #gateway
19. #frequency