Synonymous with Direct Distance Dialing (DDD). See DDD.
"1+ Dialing." YourDictionary, n.d. Web. 11 October 2018. <http://www.yourdictionary.com/1-dialing>.
1+ Dialing. (n.d.). Retrieved October 11th, 2018, from http://www.yourdictionary.com/1-dialing
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