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TTY is the system used for the Hearing Impaired so they can read instead of hear the phone. DTMF (Dual Tone Multi Frequency) is used by the phone when you are calling a land telelphone line and asked to enter press numbers to get a response, such as a password or changing to a different language.
did the tones come pre installed on the phone? why dont you try using mp3 ring tones? download mp3 songs on your phone, then you can set them as ring tones. they work much beter than ordinary ring tones