REVERSE OF NOTE iBASIS, INC. iBASIS GLOBAL, INC. 11.5% SENIOR SECURED NOTES DUE 2005 This Note is one of a duly authorized issue of Notes of the Issuer, designated as its 11.5% Senior Secured Notes Due 2005 (herein called the “Notes”), limited to the aggregate principal amount of $25,175,000, all issued or to be issued under and pursuant to (x) a Securities Exchange Agreement dated as of January 30, 2003 (herein called the “Symphony Exchange Agreement”), among the Issuer, iBasis Securities Corporation, the Symphony Funds party thereto and U.S. Bank National Association, as collateral agent (herein called the “Collateral Agent”), and (y) a Securities Exchange Agreement dated as of February 21, 2003 (herein called the “Permitted Exchange Agreement” and, together with the Symphony Exchange Agreement, the “Exchange Agreements”), among the Issuer, iBasis Securities Corporation, the Exchanging Holders party thereto and the Collateral Agent, to which Exchange Agreements and all exchange agreements supplemental thereto reference is hereby made for a description of the rights, limitations of rights, obligations, duties and immunities thereunder of the Collateral Agent, the Issuer and the holders of the Notes. The Issuer has appointed U.S. Bank National Association as fiscal agent, (herein called the “Fiscal Agent”) and as paying agent in respect of the Notes upon the terms and subject to the conditions contained in a Fiscal Agency Agreement dated as of January 30, 2003, as amended by Amendment No. 1 to Fiscal Agency Agreement dated as of February 21, 2003 (as amended, the “Fiscal Agency Agreement”), between the Issuer and the Fiscal Agent. In case an Event of Default (as defined in the Exchange Agreements) shall have occurred and be continuing, the principal of, premium, if any, and accrued interest on all Notes may be declared by either the Collateral Agent or the holders of not less than 25% in aggregate principal amount of the Notes then outstanding, and upon said declaration shall become, due and payable, in the manner, with the effect and subject to the conditions provided in the Exchange Agreements. The Exchange Agreements contain provisions prohibiting the changing, waiver, discharge or termination of the Exchange Agreements without the consent of each holder of a Note directly affected thereby if such change, waiver, discharge or termination shall (i) extend the fixed maturity of any Note, or reduce the rate or extend the time of payment of interest thereon, or reduce the principal amount thereof, (ii) amend, modify or waive the provisions of Section 13.4 of either Exchange Agreement, (iii) reduce the percentage specified in, or otherwise modify the definition of “Demand Holders” or “Required Holders” stated therein, (iv) consent to the assignment or transfer by the Issuer of any of its rights and obligations under the Exchange Agreements, (v) establish any new obligations for any holder of a Note not relating to the subject matter of the Exchange Agreements or (ii) release all or substantially all of the collateral or guarantees with respect to the Obligations specified in the Exchange Agreements. Subject to the provisions of the Exchange Agreements, the holders of a majority in aggregate principal amount of the Notes at the time outstanding may on behalf of the holders of all of the Notes waive any past Default or Event of Default under the Exchange Agreements and its consequences except a default in the payment of interest. Any such consent or waiver by the holder of this Note (unless revoked as provided in the Exchange Agreements) shall be conclusive and binding upon such holder and upon all future holders and owners of this Note and any Notes which may be issued in exchange or substitution hereof, irrespective of whether or not any notation thereof is made upon this Note or such other Notes. |