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Exhibit 16.01
September 17, 2004
Securities and Exchange Commission
450 Fifth Street, N.W.
Washington, DC 20549
Gentlemen:
We have read Item 4.01 of Form 8-K dated September 20, 2004, of CoSine Communications, Inc. and are in agreement with the statements contained in the four paragraphs on page two therein.
/s/ Ernst & Young LLP