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Links to useful pages and sites with technical and regulatory reference information.


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Tone References

World Tone Database — frequencies and cadence for telephone signaling tones throughout the world

This Is A Recording — listing of tones used around the world

PDF of ITU-T E.180 — Various tones used in national networks according to ITU-T Recommendation E.180, updated 2010.05.01

TGML: complete listing of capabilities and syntax of Tone Generation Markup Language

Developer References

git cheat sheet — tips on commonly used git commands


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