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In telephony, call progress tones are audible tones that provide an indication of the status of a telephone call to the user. The tones are generated by a central office or a private branch exchange (PBX) to the calling party.
Standards, Art & Regions
Explore the main themes, entities and connections around Call-progress tone. Start with the topic map, then use the sections below for research and deeper semantic analysis.
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tones tone frequencies may generated calling standards etsi network call equipment recommendations national exceptions countries networks ringback switch audible telephone
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| fax machines | instance of | to the calling party.Telecommunication equipment | 0.80 | text |
| modems are designed to recognize certain tones | instance of | to the calling party.Telecommunication equipment | 0.80 | text |
| such as dial tone | instance of | to the calling party.Telecommunication equipment | 0.80 | text |
| busy tone.The ITU-T E.180 | instance of | to the calling party.Telecommunication equipment | 0.80 | text |
| E.182 recommendations define the technical characteristics | instance of | to the calling party.Telecommunication equipment | 0.80 | text |
| intended usage of some of these tones | instance of | to the calling party.Telecommunication equipment | 0.80 | text |
These clusters group vocabulary that occurs around closely connected concepts in the source material.
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