Exhibit 4.22

                                    AMENDMENT

THIS AMENDMENT is made September 20, 2003 among:

      March Networks  Corporation,  a Canadian business  corporation  having its
      offices  at  Tower  B,  555  Legget  Drive,  Ottawa,  ON K2K  2X3  ("March
      Networks")

-and-

      Mitel Networks  Corporation,  a Canadian business  corporation  having its
      offices at 350 Legget Drive, Ottawa, ON K2K 2W7 ("Mitel Networks")

-and-

      Mitel Networks  International  Limited, a Barbadian  business  corporation
      having its offices at Charnic Business Centre,  Spring Garden Highway, St.
      Michael, Barbados ("MNIL")

-and-

      Mitel Networks Limited,  a UK business  corporation  having its offices at
      Mitel Business Park, Portskewett, Caldicott, UK NPZ6 5YR ("MNL")

WHEREAS:

A.    March  Networks,  Mitel  Networks,  MNIL and MNL entered  into an alliance
      agreement  effective as of September 21, 2001 (the  "Alliance  Agreement")
      with a term of two years, expiring on September 20, 2003.

B.    Pursuant to Section 9.1 of the  Alliance  Agreement,  the parties  wish to
      renew the  Alliance  Agreement  on the same terms and  conditions  for one
      additional year term expiring on September 20, 2004.

NOW THEREFORE for good and valuable  consideration,  the receipt and sufficiency
of which is hereby  acknowledged,  the parties to this Amendment hereby agree as
follows:

1.    The  term of the  Alliance  Agreement  is  hereby  extended  for one  year
      expiring September 20, 2004.




2.    All terms and conditions of the Alliance Agreement to remain the same.

IN WITNESS WHEREOF the parties hereto have caused this Amendment to be signed by
their duly authorized representatives as of the date written above.

Mitel Networks Corporation                  March Networks Corporation

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Mitel Networks International Limited        Mitel Networks Limited

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