An 1100Hz tone transmitted by a fax machine when it calls another fax machine. The half-second tone is repeated every 3.5 seconds for approximately 45 seconds. See fax switch.
"CNG tone." YourDictionary, n.d. Web. 09 November 2018. <https://www.yourdictionary.com/cng-tone>.
CNG tone. (n.d.). Retrieved November 09th, 2018, from https://www.yourdictionary.com/cng-tone
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