Call-progress tone (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Call-progress tone" in English language version.

refsWebsite

Global rank English rank

low place

low place

7,368^th place

6,009^th place

etsi.org

"Access and Terminals (AT); Public Switched Telephone Network; Support of legacy terminals by BroadBand IP equipment; Listing of the most relevant features and functionalities; Part 2: Analogue PSTN terminals" (PDF). ETSI Technical Report. ETSI TR 101 973-2 V1.1.1 (2002–12): 10 to 31. Retrieved 18 April 2021.

mesi.net

Transmitted signaling rate of 93 ms per digit with minimum 40 ms pause between tones. A 40 ms tone should be detected and a 23 ms tone must be rejected.