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1-1. Answer tone: Tone occurs
1-2. DTMF: DTMF occurs for 0 ~ 9, *, #
1-3. 2100Hz tone: CED (ANS, ANSam) occurs
1-4. 1100Hz: CNG occurs
1-5. Modulation: Modulation signal occurs
2. Detect ring: ring signal detected
3. Go off hook: Switched from on-hook to off-hook status
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