On the phone, calling progress tone is an audible tone that gives the user phone call status indication. The tone is generated by the head office or private branch exchange (PBX) to the calling party.
Tools such as fax machines and modems are designed to recognize dial tone and busy tone.
Recommendations ITU-T E.180 and E.182 define the technical characteristics and intended use of some of these tones. ToneScript is a tone description format that can be used to set tones.
Video Call-progress tone
Jenis
The main ones faced by the public are regularly listed in bold :
- busy tone or busy signal
- call waiting tone
- comfortable tone
- conference call tone
- confirmation tone
- jam tone
- dial tone
- disconnect tone
- end of three-party service tones (three-way call)
- executive replacement tone
- hold the tone
- preemption tone
- queue tone
- remember the dial tone
- recording tone
- recorder alert tone
- reorder
- ringtones (ringtones)
- power rings
- second dial tone
- special dial tone
- special information tone (SIT)
- stutter dial (used as a wait-wait indicator)
- waiting tone
Maps Call-progress tone
National tone pack
The national telephone system sets the tone to indicate the status of channels, equipment, or call results with a special tone. Such tones are standardized in every country and can consist of single or multiple frequencies. Most European countries use a single frequency between 400 and 450 Hz, while the United States uses a dual frequency system.
The tone frequency, as defined by the Right Tone Plan, is chosen in such a way that harmonic and intermodulation products will not cause unreliable signals. No frequency is a multiple of the other, the difference between any two frequencies is not equal to any frequency, and the sum of the two frequencies is not equal to any frequency. The frequency was originally designed with a 21/19 ratio, which is slightly less than the overall tone. The frequency may not vary over Ã, Â ± 1.8% of its nominal frequency, or the switching center will ignore the signal. High frequency may be volume equal to - or harder than - low frequency when sent across line. The loudness difference between high and low frequencies can be 3 decibels (dB) and is called a "twist". Tone duration must be at least 537 ms.
European Tone:
References
External links
- Tones Used in National Networks (According to ITU-T Recommendation E.180)
Source of the article : Wikipedia
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