Exhibit 21.1

SUBSIDIARIES

The full corporate name, jurisdiction of incorporation and registered and beneficial ownership of the issued and outstanding shares of each direct and indirect Subsidiary is as follows:

	Jurisdiction of
Name of Subsidiary	Incorporation	Ownership of Securities
Mitel Networks Holdings Limited	United Kingdom	Wholly-owned by the Corporation
Mitel Networks Asia Pacific Limited	Hong Kong	Wholly-owned by the Corporation
Mitel Networks Limited	United Kingdom	Wholly-owned by Mitel Networks Holdings Limited, which is in turn wholly-owned by the Corporation
Mitel Networks, Inc.	Delaware	Wholly-owned by Mitel (Delaware), Inc., which is in turn wholly-owned by Mitel US Holdings, Inc. which is in turn wholly-owned by the Corporation
Mitel U.S. Holdings, Inc.	Delaware	Wholly-owned by the Corporation
Mitel (Delaware), Inc.	Delaware	Wholly-owned by Mitel U.S. Holdings, Inc., which is in turn wholly-owned by the Corporation
Mitel Netsolutions, Inc.	Texas	Wholly-owned by Mitel (Delaware), Inc., which is in turn wholly-owned by Mitel U.S. Holdings, Inc., which is in turn wholly-owned by the Corporation
Mitel Leasing, Inc.	Arizona	Wholly-owned by Mitel (Delaware), Inc., which is in turn wholly-owned by Mitel U.S. Holdings, Inc., which is in turn wholly-owned by the Corporation
Mitel Business Systems, Inc.	Arizona	Wholly-owned by Mitel (Delaware), Inc., which is in turn wholly-owned by Mitel U.S. Holdings, Inc., which is in turn wholly-owned by the Corporation

Mitel Technologies, Inc.	Arizona	Wholly-owned by Mitel (Delaware), Inc., which is in turn wholly-owned by Mitel U.S. Holdings, Inc., which is in turn wholly-owned by the Corporation
Inter-Tel Lake Limited	Republic of Ireland	Wholly-owned by Mitel (Delaware), Inc., which is in turn wholly-owned by Mitel U.S. Holdings, Inc., which is in turn wholly-owned by the Corporation
Swan Solutions Limited	United Kingdom	Wholly-owned by Mitel Networks, Inc., which is in turn wholly-owned by Mitel (Delaware), Inc., which is in turn wholly-owned by Mitel U.S. Holdings, Inc., which is in turn wholly-owned by the Corporation
Lake Communications Limited	Republic of Ireland	Wholly-owned by Inter-Tel Lake Limited, which is in turn wholly-owned by Mitel (Delaware), Inc., which is in turn wholly-owned by Mitel US Holdings, Inc., which is in turn wholly-owned by the Corporation
Lake Electronics Technologies Limited	Republic of Ireland	Wholly-owned by Inter-Tel Lake Limited, which is in turn wholly-owned by Mitel (Delaware), Inc., which is in turn wholly-owned by Mitel US Holdings, Inc., which is in turn wholly-owned by the Corporation