IBasis (IBAS)

Summary Compensation Table

        The following table shows the compensation paid or accrued during the last two fiscal years ended December 31, 2006 and 2007 to (1) our President and Chief Executive Officer, (2) our Chief Financial Officer, (3) our three most highly compensated executive officers, other than our President and Chief Executive Officer and our Chief Financial Officer, who earned more than $100,000 during the fiscal year ended December 31, 2007.

(1)

Represents cash bonus amounts paid in respect of performance for the three quarters ended September 30, 2007.

(2)

Represents the proportionate amount of the total fair value of option awards recognized by us as an expense in 2007 or 2006 for financial accounting purposes including the period prior to the closing of the KPN Transaction. The fair values of these awards and the amounts expensed in 2007 or 2006 were determined in accordance with Financial Accounting Standards Board Statement of Financial Accounting Standards No. 123 (revised 2004) Share-Based Payment (FAS 123R). For Mr. Gneezy and Dr. VanderBrug, the amount related to option awards includes $79,017 each of stock-based compensation expense in 2007 for the accelerated vesting of options upon the closing of the KPN Transaction. These costs were not recognized as an expense by us in 2007 but were reflected in the purchase accounting associated with the KPN Transaction. In the case of 2007 amounts, see Note 4 to our Consolidated Financial Statements included in our 2007 Annual Report on Form 10-K for details as to the assumptions used to determine the fair value of unvested option awards as of the date of the closing of the KPN Transaction. In the case of the option grant to Mr. Flynn in February 2007, see Note 4 to our Consolidated Financial Statements included in our Quarterly Report on Form 10-Q for the three months ended March 31, 2007 for details as to the assumptions used to determine the fair value of this award as our consolidated results of operations included in our Annual Report on Form 10-K excludes the consolidated results of operations of iBasis prior to the closing of the KPN Transaction. In the case of

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2006 amounts, see Note 4 to our Consolidated Financial Statements included in our 2006 Annual Report on Form 10-K for details as to the assumptions used to determine the fair value of the option awards.

(3)

In the case of 2007 amounts, reflects the actual amounts paid as cash bonuses for the quarter ended December 31, 2007 and Transaction Synergy Incentives. In the case of 2006 amounts, reflects the actual amounts earned under the then-current executive officer bonus plans, although some payments were made in 2007.

(4)

Reflects the 401(k) match that is available to all of our employees.

(5)

Mr. Flynn commenced employment with us on February 15, 2007.

(6)

Includes $70,000 in relocation expenses.