Document:

Amendment to Letter Agreement, dated December 25, 2010

 Exhibit 10.31 
 AMENDMENT TO OFFER LETTER 
 KIMBERLY O’LOUGHLIN 

THIS AMENDMENT (the “Amendment”) is entered into this 25th day of December, 2010 by and among Vonage America,
Inc. (the “Company”) and Kimberly O’Loughlin (the “Executive”). 
 WHEREAS, the Company
and the Executive entered into an Offer Letter, dated as of March 24, 2009 (the “Offer Letter”). Capitalized terms used but not otherwise defined herein shall have the same meanings as in the Offer Letter; 

WHEREAS, the Executive has not undergone a “separation from service” (as defined under Section 409A of the Code);
and 
 WHEREAS, the parties hereto intend to amend the Offer Letter in order to comply with Section 409A of the
Code. 
 NOW, THEREFORE, in consideration of the promises and the mutual covenants contained herein, the parties hereto
agree as follows: 
 1. The first paragraph of Section 6 of the Offer Letter is hereby deleted and replaced in its entirety
with the following: 
 “In addition, subject to the required approvals of the
Compensation Committee of the Board of Directors of Vonage Holdings Corp., in the event your employment is terminated by the Company without “Cause” or by you with “Good Reason”, each as defined below, subject to your execution
and delivery to the Company of a Separation Agreement and General Release (a “Release”) and such Release becoming irrevocable no later than the ninetieth (90th) day following your termination of employment, you will be entitled
to severance pay equal to: (i) nine (9) months of your then-current base salary, less applicable withholding, which will be paid by the Company during its regular payroll cycle over the nine (9) month period following your employment
termination, commencing on the first payroll date after the Release has become effective and irrevocable, but in no event later than the ninetieth day following your termination of employment, with the first payment including any amounts that would
otherwise be due prior thereto; provided, however, that if the applicable ninety (90) day period begins in one taxable year and ends in a second taxable year, then the payment of severance as set forth in (i) above shall
commence on the later of (A) the first payroll date after the Release has become effective and irrevocable and (B) the first payroll date that falls in the second taxable year, but in either case, no later than the ninetieth (90th) day following your termination of employment; and (ii) a
prorated portion of your TBO, less applicable withholdings, which is based on Company performance at the end of the year following your employment termination, which shall be paid on March 31 of the

 
calendar year following the calendar year in which your employment with the Company terminates. Notwithstanding anything else to the contrary, if the Company does not receive an effective and
irrevocable Release no later than the ninetieth (90th) day following your termination of employment then you shall forfeit all rights to any and all severance payments set forth herein.” 

2. Section 7(d) is hereby amended by inserting the word “you” in the penultimate sentence of the third paragraph thereof
such that the sentence shall now read as follows: “In no event may you, directly or indirectly, designate the calendar year of any payment to be made under this Offer Letter.” 

3. Section 7(d) is hereby further amended by deleting the sentence “All reimbursements and in kind benefits provided under this
Offer Letter shall be made or provided in accordance with the requirements of section 409A of the Code.” and replacing it with the following: 
 “With respect to reimbursements or in kind benefits subject to Section 409A of the Code, (i) all such expenses or other reimbursements shall be payable in accordance with the Company’s
policies in effect from time to time, but in any event shall be made on or prior to the last day of the taxable year following the taxable year in which such expenses were incurred by you; (ii) no such reimbursement or expenses eligible for
reimbursement in any taxable year shall in any way affect the expenses eligible for reimbursement in any other taxable year; and (iii) the right to reimbursement or in-kind benefits shall not be subject to liquidation or exchanged for another
benefit. 
 4. Compliance with Section 409A of the Code. The amendments to the Offer Letter under this Amendment are
intended to comply with Section 409A of the Code and, accordingly, to the maximum extent permitted, shall be interpreted in a manner consistent with such intent and with any further regulatory, administrative or other official guidance under
Section 409A of the Code that addresses the same subject matter. Nothing contained in this Amendment shall constitute any representation or warranty by the Company regarding compliance with Section 409A of the Code. The Company has no
obligation to take any action to prevent the assessment of any additional income tax, interest or penalties under Section 409A of the Code on any person and the Company, its subsidiaries and affiliates shall not have any liability to you with
respect thereto. The employees or representatives of the Company, its subsidiaries and affiliates shall not have any personal liability to the Executive with respect the assessment of any additional income tax under Section 409A of the Code.

 5. Entire Agreement. The Offer Letter, together with this Amendment, constitutes the complete and exclusive
understanding of the parties with respect to the Executive’s employment and supersedes any other prior oral or written agreements, arrangements or understandings between the Executive and the Company. 

6. Full Force. Except as set forth in this Amendment, the Offer Letter remains in full force and effect. 

  
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 7. Compensation Committee Approval. This Amendment is subject to and contingent upon
approval and authorization by the Compensation Committee of the Board of Directors of the Company and shall be of no force or effect unless and until so authorized and approved. 

8. Headings. The headings of the paragraphs of this Amendment are inserted for convenience only and shall not be deemed to
constitute part of this Amendment or to affect the construction thereof. 
 9. Counterparts. This Amendment may be
executed in one or more counterparts, each of which shall be deemed to be an original, but all of which taken together shall constitute one and the same instrument. 
 [Signature Page Follows] 

  
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 IN WITNESS WHEREOF, the parties hereto have duly executed this Amendment as of the
date first written above. 
  

			
	 VONAGE AMERICA, INC.

		
	By:	 	     /s/ Barry Rowan

	Name:	 	Barry Rowan
	Title:	 	President
	
	 EXECUTIVE

	
	 /s/ Kimberly O’Loughlin

	 Kimberly O’Loughlin

 [SIGNATURE PAGE – AMENDMENT TO O’LOUGHLIN OFFER LETTER]Amendment to Letter Agreement, dated December 23, 2010

 Exhibit 10.33 
 AMENDMENT TO AMENDED OFFER LETTER 
 MICHAEL TEMPORA 

THIS AMENDMENT (the “Amendment”) is entered into this 23rd day of December, 2010 by and among Vonage America Inc.
(the “Company”) and Michael Tempora (the “Executive”). 
 WHEREAS, the Company and the
Executive entered into an offer letter, dated as of November 19, 2008 (the “Offer Letter”), and amended as of December 30, 2008 (the “409A Addendum” and, together with the Offer Letter, the
“Amended Offer Letter”). Capitalized terms used but not otherwise defined herein shall have the same meanings as in the Amended Offer Letter; 
 WHEREAS, the Executive has not undergone a “separation from service” (as defined under Section 409A of the Code); and 

WHEREAS, the parties hereto intend to amend the Amended Offer Letter in order to comply with Section 409A of the Code.

 NOW, THEREFORE, in consideration of the promises and the mutual covenants contained herein, the parties hereto agree
as follows: 
 1. The first paragraph of Section 6 of the Amended Offer Letter is hereby deleted and replaced in its
entirety with the following: 
 “In addition, subject to the required approvals of the
Compensation Committee of the Board of Directors of Vonage Holdings Corp., in the event your employment is terminated by the Company without “Cause” or by you with “Good Reason”, each as defined below, subject to your execution
and delivery to the Company of a Separation Agreement and General Release (a “Release”) and such Release becoming irrevocable no later than the ninetieth (90th) day following your termination of employment, you will be entitled to severance pay equal to: (i) nine
(9) months of your then-current base salary, less applicable withholding, which will be paid by the Company during its regular payroll cycle over the nine (9) month period following your employment termination, commencing on the first
payroll date after the Release has become effective and irrevocable, but in no even later than the ninetieth
(90th) day following your termination of employment,
with the first payment including any amounts that would otherwise be due prior thereto; provided, however, that if the applicable ninety (90) day period begins in one taxable year and ends in a second taxable year, then the
payment of severance as set forth in (i) above shall commence on the later of (A) the first payroll date after the Release has become effective and irrevocable and (B) the first payroll date that falls in the second taxable year, but
in either case, no later than the ninetieth
(90th) day following your termination of employment;
and (ii) a prorated portion of your TBO, less applicable withholdings, which will be calculated and paid on March 31 of the year 

 
following the year in which your employment terminated. Notwithstanding anything else to the contrary, if the Company does not receive an effective and irrevocable Release no later than the
ninetieth (90th) day following your termination of employment then you shall forfeit all rights to any and all severance payments set forth herein.” 
 2. The 409A Addendum to the Amended Offer Letter is hereby amended by deleting the sentence “All reimbursements shall be made or provided in accordance with the requirements of section 409A of the
Code.” And replacing it with the following: 
 “ With respect to reimbursements or in kind benefits
subject to Section 409A of the Code, (A) All expenses or other reimbursements as provided herein shall be payable in accordance with the Company’s policies in effect from time to time, but in any event shall be made on or prior to the
last day of the taxable year following the taxable year in which such expenses were incurred by you; (B) no such reimbursement or expenses eligible for reimbursement in any taxable year shall in any way affect the expenses eligible for
reimbursement in any other taxable year; and (C) the right to reimbursement or in-kind benefits shall not be subject to liquidation or exchanged for another benefit. 
 3. Compliance with Section 409A of the Code. The amendments to the Amended Offer Letter under this Amendment are intended to comply with Section 409A of the Code and, accordingly, to the
maximum extent permitted, shall be interpreted in a manner consistent with such intent and with any further regulatory, administrative or other official guidance under Section 409A of the Code that addresses the same subject matter. Nothing
contained in this Amendment shall constitute any representation or warranty by the Company regarding compliance with Section 409A of the Code. The Company has no obligation to take any action to prevent the assessment of any additional income
tax, interest or penalties under Section 409A of the Code on any person and the Company, its subsidiaries and affiliates shall not have any liability to you with respect thereto. The employees or representatives of the Company, its subsidiaries
and affiliates shall not have any personal liability to the Executive with respect the assessment of any additional income tax under Section 409A of the Code. 
 4. Entire Agreement. The Amended Offer Letter, together with this Amendment, constitutes the complete and exclusive understanding of the parties with respect to the Executive’s employment and
supersedes any other prior oral or written agreements, arrangements or understandings between the Executive and the Company. 

5. Full Force. Except as set forth in this Amendment, the Amended Offer Letter remains in full force and effect. 

6. Compensation Committee Approval. This Amendment is subject to and contingent upon approval and authorization by the
Compensation Committee of the Board of Directors of the Company and shall be of no force or effect unless and until so authorized and approved. 

  
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 7. Headings. The headings of the paragraphs of this Amendment are inserted for
convenience only and shall not be deemed to constitute part of this Amendment or to affect the construction thereof. 
 8.
Counterparts. This Amendment may be executed in one or more counterparts, each of which shall be deemed to be an original, but all of which taken together shall constitute one and the same instrument. 

[Signature Page Follows] 

  
 3 

 IN WITNESS WHEREOF, the parties hereto have duly executed this Amendment as of the
date first written above. 
  

			
	VONAGE AMERICA INC.
		
	By:	 	     /s/ Barry Rowan

	Name:	 	Barry Rowan
	Title: 	 	President
	
	EXECUTIVE
	
	     /s/ Michael Tempora

	 Michael Tempora

[SIGNATURE PAGE – AMENDMENT TO TEMPORA AMENDED OFFER LETTER]

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