Document:

Master Procurement Agreement

 EXHIBIT 10.26 
 Amendment No. 6 
 To the 
 Master Procurement Agreement 
 Between 
 Arbinet-thexchange, Inc. and Tekelec 
 This Amendment
No. 6 is effective as of this 2lst day of December, 2005 (“Amendment No. 6 Effective Date”), between Arbinet-thexchange, Inc., a Delaware corporation, having an office at 460 Herndon Parkway, Herndon, VA 10004 (“Customer”) and
Tekelec, a California corporation, having an office at 3605 East Plano Parkway, Plano, Texas 75074 (“Tekelec”). All capitalized terms set out below shall have the meaning set forth for such terms in the Agreement. 
 WHEREAS, Customer and Tekelec entered into a Master Procurement Agreement dated March 7, 2003, as amended by Amendments 1 through 5; and 
 WHEREAS, Customer and Tekelec now wish to further amend the Agreement to, among other things, extend the term of the Volume Commitment for 2005 established in Amendment
No.2. 
 NOW, THEREFORE, in consideration of the mutual promises and undertakings set forth herein and other good and valuable consideration, the receipt and
sufficiency of which is hereby acknowledged, the Parties agree as follows: 
  

	1.	Customer and Tekelec hereby agree to extend the date by which Customer may satisfy the annual Volume Commitment for 2005 from December 31, 2005 to March 3, 2006 (“Extended
Date”). 

  

	2.	This Amendment, together with the Agreement, contains Tekelec’s and Customer’s entire understanding with respect to the subject matter herein and supersedes all prior
agreements and understandings, written or otherwise between Tekelec and Customer with respect thereto. Except as expressly modified in this Amendment, all terms and conditions of the Agreement and 

 currently effective amendments remain in full force and effect. 
 IN WITNESS WHEREOF, Customer and Tekelec have caused this Amendment No. 6 to be signed by their duly authorized representatives as of the date first set forth above. 
  

					
	Arbinet-thexchange, Inc.	 		 	Tekelec
			
	 /s/ Peter P. Sach
	 		 	 /s/ Lori G. Craven

	Signature	 		 	Signature
			
	 Peter P. Sach
	 		 	 LORI CRAVEN

	Typed or Printed Name	 		 	Typed or Printed Name
			
	 CIO & SVP Operations
	 		 	 EVP

	Title	 		 	Title

 Confidential InformationLease Termination Agreement

 EXHIBIT 10.28 
 LEASE TERMINATION AGREEMENT 
 AGREEMENT, as of this 28th day of December, 2005 between
BROAD FINANCIAL CENTER LLC, a New York limited liability company, having an office at 565 Fifth Avenue, 30th Floor, New York, New York 10017 (hereinafter called “Landlord”) and ARBINET COMMUNICATIONS, INC., a Delaware corporation, qualified to transact business in the State of New York, having an
office at 75 Broad Street, 20th Floor, New York, New York 10004 (hereinafter called
“Tenant”). 
 W I T N E S S E T
H : 
 WHEREAS: 
 (1) Landlord, and Tenant executed that certain lease dated as of September 30, 1999 (the “Lease”), covering the entire rentable area of the nineteenth (19th) floor (the “Premises”)
in the building known as Broad Financial Center, 33 Whitehall Street, New York, New York (the “Building”), for a term to expire on December 31, 2009 (the “Expiration Date”);
and 
 (2) Landlord and Tenant desire to accelerate the Expiration Date of the Lease and to enter into certain other agreements incidental
thereto, subject to the provisions of this Agreement. 
 NOW, THEREFORE, in consideration of the mutual covenants herein
contained, it is agreed as follows: 
 FIRST: The Lease is hereby amended by changing the Expiration Date to December 31, 2005.

 SECOND: On or prior to the Expiration Date, Tenant shall surrender the Premises to Landlord in accordance with the Lease provisions
pertaining thereto. 
 THIRD: Tenant hereby covenants that it shall be liable for the observance and performance of each and every one
of the terms, covenants and conditions of the Lease on 

 Tenant’s part to be observed and performed by it up to the Expiration Date including, without limitation, the
payment of fixed annual rent, additional rent and all other charges due under the Lease. 
 FOURTH: Tenant covenants that it has not
done or suffered anything to be done whereby the Premises have been encumbered in any way whatsoever, and that the Premises shall not be in any way be encumbered on the Expiration Date. 
 FIFTH: (a) Tenant shall pay to Landlord the sum of One Million Three Hundred Fifty Thousand and 00/100 ($1,350,000.00) Dollars as a
termination fee (the “Termination Fee”) in consideration for an early termination of the Lease. 
 (b) The
Termination Fee shall be payable as follows: 
 (i) Five Hundred Twenty Four Thousand Seven Hundred Sixty-Five and 00/100 ($524,765.00)
Dollars by bank or certified check or wire transfer upon execution of this Agreement by Tenant and Landlord (Landlord’s signature to be confirmed to Tenant by facsimile copy of the signature page of this Agreement sent to Tenant); and

 (ii) Eight Hundred Twenty Five Thousand Two Hundred Thirty Five and 00/100 ($825,235.00) Dollars, payable in equal monthly installments
of $17,192.39 per month during the period from January 1, 2006 through December 31, 2009. 
 (c) The Termination Fee set forth in
(b) (ii) above shall be paid in equal monthly installments in advance on the first day of each calendar month during the above period at the office of the Landlord or such other place as Landlord may designate without any setoff or
deduction whatsoever. Tenant shall pay the Termination Fee in lawful money of the United States by check (subject to collection) drawn to the order of Broad Financial Center LLC, or such other party as Landlord may from time to time designate.

 (d) If Tenant shall fail to pay when due any installment of the Termination Fee when due and such failure shall continue for five
(5) business days beyond the date such payment was due, Tenant shall pay, interest on such amounts at the Interest Rate (as defined below) from the last day of such five-business day period to the date the same is paid to Landlord,
“Interest Rate” shall mean a rate per annum equal to the lesser of (a) 2% above the so-called “prime rate” of Citibank N.A., as publicly announced from time to time or if Citibank 
  

 2 

 N.A. shall cease to exist or cease to announce such rate, any similar rate designed by Landlord which is publicly
announced from time to time by any other bank in the City of New York having combined capital and surplus in excess of $100,000,000 or (b) the maximum rate or interest, which Tenant may legally contract to pay. 
 (e) If Tenant shall fail to pay when due any installment of the Termination Fee and such failure shall continue for more than ten (10) business
days following written notice that said sum was due, then, in addition to any other right or remedy available to Landlord, Landlord shall have the right to accelerate the entire Termination Fee, which amount shall be due in full within ten
(10) business days following demand. 
 SIXTH: Each party represents that it dealt with no broker in connection with bringing
about this Agreement other than CB Richard Ellis Brokerage (“CB”) and Newmark & Company Real Estate, Inc. (“Newmark”). Each party agrees to indemnify and hold the other harmless
from and against all claims, losses., judgments, costs and expenses (including reasonable attorneys’ fees and disbursements) arising out of any breach of the foregoing representation. CB’s commission shall be paid by Landlord pursuant to
the terms of a separate agreement. Newmark’s commission shall be paid by Tenant pursuant to the terms of a separate agreement. The provisions of this Article shall survive termination of this Agreement. 
 SEVENTH:. Each party does hereby release and relieve the other party, their respective agents, officers, directors, employees and their respective
successors and/or assigns from and against any and all actions, causes of action, suits, controversies, damages, judgments, claims and demands whatsoever, at law or in equity of every kind and nature whatsoever arising out of, or in connection with,
the Lease or the Premises, except for the return of the Security Deposit as provided in Paragraph Twelfth below and except that nothing herein shall relieve Tenant of its obligations under this Agreement. 
 EIGHTH: Tenant shall reimburse Landlord upon demand for all reasonable costs and expenses (including reasonable attorneys’ fees and
disbursements and court costs) incurred by Landlord in connection with enforcing Tenant’s obligations hereunder. 
 NINTH: It is
specifically understood and agreed that the submission of this Agreement to Tenant shall not be construed as an offer, nor shall Tenant have any rights or obligations with respect thereto, unless and until Landlord shall execute a copy of this
Agreement and deliver the same to Tenant. 
  

 3 

 TENTH: This Agreement may not be changed, modified or cancelled orally and shall inure to the
benefit of, and be binding upon, the parties hereto and their respective successors and assigns. 
 ELEVENTH: Time is of the essence
with respect to the surrender of the Lease and Premises in accordance with this Agreement. The failure of Tenant to vacate and surrender the Premises in accordance with the terms of this Agreement shall, in addition to all other rights or remedies,
subject Tenant to the provisions of Article 28 of the Lease. 
 TWELFTH: The security deposit letter of credit held by Landlord in
accordance with Article 40 of the Lease and the letter authorizing cancellation of the letter of credit in the form annexed as Exhibit A hereto and made a part hereof shall be delivered by Landlord to Tenant upon confirmation by
Landlord’s bank that the first payment of the Termination Fee in the amount of Five Hundred Twenty Four Thousand Seven Hundred Sixty-Five and 00/100 ($524,765.00) Dollars has been properly received into Landlord’s account, provided Tenant
has surrendered the Premises in accordance with the terms of this Agreement and complied with all of the terms, covenants and conditions of the Lease. Landlord shall send Tenant an executed facsimile of Exhibit A once its bank has confirmed receipt
of the first payment of the Termination Fee. 
 THIRTEENTH: This Agreement shall be construed and governed by the laws of the State of
New York. 
 FOURTEENTH: This Agreement is expressly conditioned upon Landlord’s successful conclusion of a lease agreement
satisfactory to Landlord with respect to the Premises with Fitch, Inc. 
  

 4 

 IN WITNESS WHEREOF, the parties hereto have hereunto set their hands and seals as of the
day and year first above written. 
  

			
	BROAD FINANCIAL CENTER, LLC, Landlord
		
	By:	 	 /s/ Dr. Axel Stawski

	Name:	 	Dr. Axel Stawski
	Title:	 	Manager
	
	ARBINET COMMUNICATIONS, INC. Tenant
		
	By:	 	 /s/ Peter P. Sach

	Name:	 	Peter P. Sach
	Title:	 	Chief Administrative Officer

  

			
	 STATE OF NEW JERSEY
	 	)
		 	 :ss.

	 COUNTY OF MIDDLESEX
	 	)

 On the 23rd day of December in the year 2005, before me, the undersigned, personally appeared Peter P. Sach, personally known to me or proved to me on the basis of satisfactory evidence to be the individual(s)
whose name(s) is(are) subscribed to the within instrument and acknowledged to me that he/she/they executed the same in his/her/their capacity(ies), and that by his/her/their signature(s) on the instrument, the individual(s), or the person upon
behalf of which the individual(s) acted, executed the instrument. 
  

	
	 /s/ Patrice E. Fearon

	Notary Public
	
	PATRICE E. FEARON
	Notary Public of New Jersey
	My Commission Expires
	May 19, 2007

 EXHIBIT A 
 LETTER OF CREDIT CANCELLATION LETTER 
 BROAD FINANCIAL CENTER LLC 
 565 Fifth Avenue, 30th
Floor 
 New York, New York 10017 
 RE: CONSENT TO CANCELLATION OF FLEET NATIONAL BANK LETTER OF CREDIT NO. JS1125651 
 WE, BROAD FINANCIAL CENTER LLC, BENEFICIARY UNDER FLEET
NATIONAL LETTER OF CREDIT NO. JS1125651, ISSUED BY FLEET NATIONAL BANK ON BEHALF OF ARBINET COMMUNICATIONS, INC. (APPLICANT), BY THIS LETTER CONSENT TO THE CANCELLATION AND TERMINATION OF THE ABOVE REFERENCED LETTER OF CREDIT NO. JS1125651 IN THE
AMOUNT OF USD 176,796.91. 
 BENEFICIARY FURTHER CONFIRMS THAT WE, BROAD FINANCIAL CENTER LLC, HAVE NO INTENT TO DEMAND PAYMENT UNDER SAID LETTER OF CREDIT,
NOW OR IN THE FUTURE, AND THAT FLEET NATIONAL BANK IS HEREBY RELEASED OF ALL LIABILITY UNDER LETTER OF CREDIT NUMBER JS1125651. 
  

	
	 /s/    Dr. Axel Stawski

	Name: Dr. Axel Stawski
	Title: Manager
	AUTHORIZED SIGNATURE FOR
	BROAD FINANCIAL CENTER LLC

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