JOINT FILING AGREEMENT
EXHIBIT
1
The
undersigned hereby consent to the joint filing by any of them of a Statement
on
Schedule 13D and any amendments thereto, whether heretofore or hereafter
filed,
relating to the securities of iBasis, Inc., and hereby affirm that this Schedule
13D is being filed on behalf of each of the undersigned.
Dated:
October [●], 2007
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KONINKLIJKE
KPN N.V.,
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by
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/s/
X. X. Xxxxxxxxxxxx
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Name:
X. X. Xxxxxxxxxxxx
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Title:
Chairman of the Board
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KPN
B.V.,
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by:
KONINKLIJKE KPN N.V.,
its
sole director
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/s/
X. X. Xxxxxxxxxxxx
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Name:
X. X. Xxxxxxxxxxxx
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Title:
Chairman of the Board
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