https://en.wikipedia.org/w/index.php?title=Telephone_network&oldid=1046265527 http://www.ontologyrepository.com/CommonCoreOntologies/Mid/EventOntology Private Network Telephone Call A Telephone Call transmitted over a network where a closed group of telephones are connected primarily to each other and use a gateway to reach the outside world, usually used inside companies and call centers (a.k.a. private branch exchange (PBX)).