A PBX trunk that supports both incoming and outgoing calls. See also PBX and trunk.
"combination trunk." YourDictionary, n.d. Web. 12 October 2018. <http://www.yourdictionary.com/combination-trunk>.
combination trunk. (n.d.). Retrieved October 12th, 2018, from http://www.yourdictionary.com/combination-trunk
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