EXHIBIT 99.2

                            CERTIFICATION PURSUANT TO
                             18 U.S.C. SECTION 1350
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

        In connection with the Quarterly Report of Cosine Communications, Inc.
(the "Company") on Form 10-Q for the quarterly period ended September 30, 2002
as filed with the Securities and Exchange Commission on the date hereof (the
"Report"), I, Terry Gibson, Executive Vice President and Chief Financial Officer
of the Company, certify, pursuant to 18 U.S.C. section 1350, as adopted pursuant
to section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

        (1)     The Report fully complies with the requirements of section 13(a)
                of the Securities Exchange Act of 1934; and

        (2)     The information contained in the Report fairly presents, in all
                material respects, the financial condition and results of
                operations of the Company.

/s/  Terry Gibson
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Terry Gibson
Executive Vice President and Chief Financial Officer
November 14, 2002