OFFER TO AMEND CERTAIN OPTIONS
Before signing this election form, please make sure you have received, read and understand the
documents that make up this offer, including: (1) the Offer to Amend Certain Options (the “Offer to Amend”),
dated July 13, 2007; (2) the memorandum from Ofer Gneezy dated July 13, 2007; (3) this election form; and (4)
the withdrawal form. The offer is subject to the terms of these documents as they may be amended.
The offer provides eligible employees who hold eligible options the opportunity to amend certain
outstanding options and receive cash payments, as described in Section 2 of the Offer to Amend. This offer
expires at 5:00 p.m., Eastern Time, on August 10, 2007 unless extended. PLEASE FOLLOW THE
INSTRUCTIONS ATTACHED TO THIS FORM.
If you participate in this offer with respect to an affected option, you must accept the offer with respect to
all of your affected options. If you have exercised a portion of an affected option, your election will apply to the
portion that remains outstanding and unexercised. Vesting of any amended options on any date is subject to your
continued service with iBasis through each relevant vesting date.
BY PARTICIPATING, YOU AGREE TO ALL TERMS OF THE OFFER AS SET FORTH IN
THE OFFER DOCUMENTS AND ACKNOWLEDGE THAT NO CASH PAYMENTS WILL BE
MADE UNTIL JANUARY 2008.
If you would like to participate in this offer, please indicate your election by checking the box below and
completing and signing this election form. Please be sure to follow the instructions, which are attached.
You may withdraw this election as to all of your affected options by submitting a properly completed and
signed withdrawal form prior to the expiration date which will be 5:00 p.m., Eastern Time, August 10, 2007
Please check the appropriate box:
o Yes, I wish to participate in the offer as to ALL of my affected option grants listed on the
Addendum issued to me.
o No, I do NOT