United Communications

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United Communications Systems, doing business as Call One, offers voice, data, video and Internet services with phone systems and network equipment. Established in 1992, it is the first telecommunications provider to be certified by the Illinois Commerce Commission as a competitive local exchange carrier. Call One is one of the largest resellers of AT&T local and global network services in Illinois. The company provides local and global incumbent networks and the flexibility to take advantage of competitive carrier networks and services. Its VoIP technology combines voice, data and video communications and PBX applications on a single network. Call One additionally offers a one-call source for phone and inside wiring systems, installation and cabling. The company is located in Chicago.