Answer tone
Answer tone is a feature of wireline modems. The answer tone is the first signal sent by the answering modem after the billing delay. In its most basic form, it is a single continuous tone with a frequency of 2100 Hz (or 2225 Hz for Bell modes). It is the tone heard by the caller after dialing the number. The plain 2100 Hz tone is meant to disable echo suppressors on international trunk connections. It may include 180° phase reversals at intervals of 450 ms to disable network echo cancellers. It may also be amplitude modulated by a 15 Hz signal to indicate ITU-T V.8 capability.
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Answer tone
Answer tone is a feature of wireline modems. The answer tone is the first signal sent by the answering modem after the billing delay. In its most basic form, it is a single continuous tone with a frequency of 2100 Hz (or 2225 Hz for Bell modes). It is the tone heard by the caller after dialing the number. The plain 2100 Hz tone is meant to disable echo suppressors on international trunk connections. It may include 180° phase reversals at intervals of 450 ms to disable network echo cancellers. It may also be amplitude modulated by a 15 Hz signal to indicate ITU-T V.8 capability.
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Answer tone is a feature of wi ...... indicate ITU-T V.8 capability.
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sound recording
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Description
Typical 2,100Hz answer tone with phase reversals and amplitude modulation.
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ITU-T Answer Tone
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Answer tone is a feature of wi ...... indicate ITU-T V.8 capability.
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Answer tone
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