AT&T Canada Commercial 1999

Allstream is a business communications provider based in Mississauga, Ontario that provides IP connectivity, managed IP services, unified communications and voice services to its customers in the United States and Canada.

The company traces its history to CNCP Telecommunications, a joint company operated by Canadian National Railway (CN) and Canadian Pacific Railway (CP) from the 1960s. In the 1980s they changed the name to Unitel Communications in a bid to offer commercial long distance service. The service changed hands several times, for a time becoming AT&T Canada.

Allstream emerged in its current form in 2012 when its latest owners Manitoba Telecom Services (MTS) split off the commercial side of their offerings. Allstream is currently owned by Zayo, a US-based fibre optic network operator.