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. 22 June 2018. <http://www.yourdictionary.com/cng-tone>.
CNG tone. (n.d.). Retrieved June 22nd, 2018, from http://www.yourdictionary.com/cng-tone
Do you use YourDictionary every day? If not, remember that it is never to late to do so!
Let us be there for you: