Document:

Separation Agreement and Release

 Exhibit 10.75 
  
 December 21, 2005 
  
 Mr. John Bonde 
  

	 	Re:	Separation Agreement and Release 

  
 Dear Mr. Bonde: 
  
 This letter will confirm our understanding concerning the termination of your employment with CSG Systems International, Inc. and CSG Software, Inc. (the “Companies”). This letter (hereafter referred to as
this “Agreement”) outlines the benefits you will receive, and the legal rights you will waive, upon your execution of this Agreement and will constitute a binding contract between you and the Companies when executed by you. You are
encouraged to consult an attorney and to review this Agreement carefully. 
  

	1.	Separation from Employment; Final Pay and Benefits Under Employment Agreement. 

  
 Effective upon the close of business December 31, 2005 you will cease performing your responsibilities for the Companies and will
relinquish all titles and authorities you have with respect to the Companies and their affiliates. You will no longer be authorized to incur any expenses, obligations or liabilities on behalf of the Companies and must return all property of the
Companies within your possession, including customer lists, information, forms, formulas, plans, documents and other written and computer materials, and copies of the same, as well as any software or hardware owned by the Companies (e.g., laptop
computers and cell phones and other wireless communications devices) belonging to the Companies or any of their customers. 
  
 You will receive the benefits to which you are entitled under Paragraph 10(e) of your Employment Agreement with the Companies dated December 18, 2004, as amended,
which is hereby incorporated by reference (the “Employment Agreement”), subject to the terms and conditions of the Employment Agreement. The Company will withhold from amounts payable to you under the Employment Agreement, as applicable,
state and federal income taxes and payroll taxes and all other deductions authorized by law or by you. 

 December 21, 2005 
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 If you elect to sign this Agreement and not exercise your right of revocation as described in paragraph 10 below,
then your last date of employment will be December 31, 2005. If you elect not to sign this Agreement, or if you sign this Agreement and subsequently exercise your right of revocation as described in paragraph 10 below, then your last date of
employment will be December 31, 2005. 
  

	2.	Separation Benefits. 

  
 Upon your execution of this Agreement and the expiration of the seven (7) day revocation period described in paragraph 10 below without your revocation of this
Agreement, you will receive, in addition to the benefits provided for in Paragraph 10(e) of the Employment Agreement, the benefits described in paragraph 3 below. 
  

	3.	Stock Options and Restricted Shares. 

  
 If you were granted Stock Options during your employment with the Company, then all vested and exercisable stock options must be exercised within ninety (90) days
after your last date of employment as defined in paragraph 1 above. Subject to and contingent upon the expiration of the seven (7) day revocation period described in paragraph 10 below without your revocation of this Agreement, the following
shares of restricted stock of CSG Systems International, Inc. previously granted to you automatically shall become fully vested and the restrictions and forfeiture provisions associated with such shares shall lapse: 
  

			
	 Grant Date

	  	Number of Shares

	 June 30, 2005
	  	25,000

  
 but all other provisions of the
Restricted Stock Award Agreements pertaining to such shares shall remain in full force and effect. 
  

	4.	Governing Law. 

  
 This agreement shall be interpreted and construed in accordance with the laws of the State of Colorado. 
  

	5.	Your Release of the Company. 

  
 In consideration for the benefits provided to you under this Agreement, you hereby fully and forever release and discharge the Companies and any parent, subsidiary,
affiliate or related entity of the Companies and all of their respective officers, directors, shareholders, employees, agents, 

 December 21, 2005 
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predecessors, successors and assigns (collectively, the “Releasees”) from any and all claims, causes of action, liabilities and demands of any kind
whatsoever, whether presently known or unknown, asserted or unasserted, matured or not yet matured, that you now may have or in the future may have against the Releasees or any of them, which arose on or before the date that you sign this Agreement
and which arise out of or are related to your employment with, or separation from employment with, the Companies; provided, however, that the foregoing release shall not apply to any rights of indemnification which you may have (i) under the
Indemnification Agreement referred to in paragraph 13 below, (ii) under the certificate of incorporation or bylaws of the Companies, or (iii) under the General Corporation Law of Delaware. The claims which you are releasing include, but
are not limited to, all claims of discrimination on the basis of race, color, religion, sex, age, national origin, disability, or any other improper factor; breach of contract; impairment of economic opportunity; interference with contractual or
employment relations; infliction of emotional distress; fraud; misrepresentation; defamation; or invasion of privacy, and specifically include but are not limited to claims under the Age Discrimination in Employment Act, the Americans with
Disabilities Act, the Family and Medical Leave Act, 42 U.S.C. Sec. 1981, Title VII of the Civil Rights Act of 1964, and any other federal or state constitution, statute, ordinance or regulation, or common law. Except as otherwise expressly provided
in this paragraph 5 with respect to rights of indemnification, this release includes all claims for compensatory, punitive and liquidated damages, attorney fees and costs, is intended to fully and forever eliminate all employment-related claims you
may have against the Releasees or any of them, and shall be broadly interpreted to achieve that goal. You understand that this is a GENERAL RELEASE. 
  

	6.	Confidential Information. 

  
 During your employment with the Companies you had access to the confidential and proprietary information and trade secrets of the Companies, as well as those of the
parent, affiliated, subsidiary and related entities of the Companies (the “CSG Group”) and of third parties with whom the CSG Group does business. This includes information and data concerning research, development, strategic planning,
trade secrets, customer accounts, customer lists and preferences (including preferred/best customer lists), marketing activities and procedures, pricing policies and practices, salaries, personnel and contractors of the CSG Group, accounting
practices and procedures, financial data, arrangements and practices, pro formas, sales methods, personnel files, data processing and other record keeping systems, software, and other information relating to the operations of the CSG Group. As
further and essential consideration for the benefits provided to you under this Agreement, you agree that you will not disclose or impart to any other person, directly or indirectly, any of such information, nor will you remove any of such
information from the premises of the CSG Group; you will immediately return to the Companies any confidential information that you may have in your possession, including any copies, regardless of the form of such information or the media on which it
resides; and you will not 

 December 21, 2005 
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retain any copies of such information and will not assist another in the use, disclosure or copying of such confidential information. In the event that you
violate any of the terms of this paragraph, the Companies may withhold and/or recover from you all of the economic benefits paid or provided or agreed to be paid or provided to you pursuant to paragraph 3 above, without waiving their right to pursue
any other legal or equitable remedies, and your entitlement to such benefits shall cease and be forfeited. 
  

	7.	Restrictive Covenants. 

  
 The restrictive covenants contained in the Employment Agreement, including but not limited to Paragraphs 11, 18, and 19 thereof, as well as the agreements granting you
stock options or restricted shares of stock of CSG Systems International, Inc. shall remain in full force and effect. 
  

	8.	Validity and Severability. 

  
 Both you and the Companies agree that neither you nor the Companies will seek to defeat, or seek to have declared invalid, any provision of this Agreement. In the event
that any part of the covenants referenced in paragraph 7 above shall be held to be invalid or unenforceable, the remaining parts thereof shall nevertheless continue to be valid and enforceable as though the invalid and unenforceable parts thereof
had not been included therein. If any provision of such covenants shall be declared by a court of competent jurisdiction to exceed the maximum provisions which the court deems reasonable and enforceable, then such provisions shall be deemed to be
reformed to those which such court deems reasonable and enforceable. 
  
 If a
court finds that any provision of this Agreement is unenforceable, then that provision will be severed and the balance of the Agreement will be enforceable; provided, however, that if you petition or otherwise request a court to declare any of
paragraphs 6, 7 or 8 of this Agreement unenforceable and such court enters an order or judgment to such effect, then this entire Agreement may, at the option of the Companies, be declared to be null and void, in which case the Companies shall have
the right to recover from you the shares of stock referred to in paragraph 3 above or the proceeds thereof if you have sold any of such shares. 
  

	9.	Non-Disclosure. 

  
 You agree not to disclose the existence or contents of this Agreement or the benefits provided to you hereunder. Notwithstanding the prohibition in the preceding
sentence, (a) the Companies and you may disclose this Agreement in confidence to their respective attorneys, accountants, auditors, tax preparers, and financial or other advisors, (b) the Companies may disclose this Agreement as necessary
to fulfill standard or legally required corporate or public reporting or disclosure requirements, (c) the Companies may disclose this Agreement upon request from any government 

 December 21, 2005 
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entity, and (d) the Companies and you may disclose this Agreement insofar as such disclosure may be necessary to enforce its terms or as otherwise
required by law. If the Companies make a public disclosure of this document (or the contents thereof) pursuant to an exception set forth above, then you will be released from the obligations set forth in this paragraph 9. 
  

	10.	Time to Consider and Right to Revoke. 

  
 You may, at your option, before signing this Agreement, consider it for a period of 45 days from the day it is presented to you. During that period you should review and
discuss it with your attorney. After you sign this Agreement, you will have a period of seven (7) days to revoke it by notifying the Company in writing delivered to the SVP Corporate Development and General Counsel of CSG Systems, Inc.
in Denver, Colorado. This Agreement will not become effective or enforceable until the seven (7) day revocation period expires, and no rights under paragraph 3 above shall arise until such period has expired without your revocation of this
Agreement. 
  

	11.	References. 

  
 The Companies agree to provide neutral reference responses to inquiries about you from prospective employers. The responses will include a verification of past employment, dates of employment and job titles.

  

	12.	No Admission. 

  
 Neither the payment of any sum of money nor any rights or benefits granted to you in this Agreement nor the execution of this Agreement by the Companies shall in any way be construed to be an admission of any wrongful
or unlawful act whatsoever on the part of the Companies, and the Companies specifically disclaim any liability to you for any wrongful or unlawful act against you. 
  

	13.	Indemnification Agreement. 

  
 The Companies hereby confirm to you that the Indemnification Agreement between CSG Systems International, Inc. and CSG Systems, Inc. (as the Company) and you (as the
Indemnitee) dated as of January 1, 2005, will remain in effect in accordance with its terms after the termination of your employment with the Companies on the Closing Date. 
  
 If this Agreement is acceptable to you, please sign and date the enclosed copy of this Agreement in the space indicated and return it to me.

  

	
	 Sincerely yours,

	
	 /s/ Joseph T. Ruble

	 Joseph T. Ruble
 SVP Corporate Development and General Counsel
 of CSG Systems, Inc. and General Counsel of CSG
 Systems International, Inc.

 December 21, 2005 
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 of 6 
  

 By signing below, I accept the foregoing Agreement in its entirety. I acknowledge that I have been encouraged to
consult an attorney, have been allowed 45 days to consider this Agreement, understand every provision of this Agreement, and execute this Agreement voluntarily and without duress or coercion. 
  

					
			
	/s/ John H. Bonde	 	 	 	12/21/05
	EMPLOYEE (John Bonde)	 	 	 	DATE

  
 If an attorney reviews this
Agreement on your behalf, please have the attorney sign below. 
  

	
	APPROVED AS TO FORM AND CONTENT
	
	  
	Attorney for EmployeeLOAN MODIFICATION AGREEMENT

 Exhibit 10.28.1 
  
 LOAN MODIFICATION AGREEMENT 
  

This Loan Modification Agreement (this “Loan Modification Agreement’) is entered into as of December 21, 2005, by and between SILICON
VALLEY BANK, a California-chartered bank, with its principal place of business at 3003 Tasman Drive, Santa Clara, California 95054 and with a loan production office located at One Newton Executive Park, Suite 200, 2221 Washington Street,
Newton, Massachusetts 02462, doing business under the name “Silicon Valley East” (“Bank”) and, ARTISOFT, INC., a Delaware corporation with its principal place of business at One Memorial Drive, Cambridge, Massachusetts
02142 and VERTICAL COMMUNICATIONS ACQUISITION CORP., a Delaware corporation with its principal place of business at One Memorial Drive, Cambridge, Massachusetts 02142 (singly and collectively, jointly and severally, “Borrower”).

  
 1. DESCRIPTION OF EXISTING INDEBTEDNESS AND OBLIGATIONS. Among other
indebtedness and obligations which may be owing by Borrower to Bank, Borrower is indebted to Bank pursuant to a loan arrangement dated as of September 28, 2005, evidenced by, among other documents, a certain Loan and Security Agreement dated as
of September 28, 2005 between Borrower and Bank (the “Loan Agreement”). Capitalized terms used but not otherwise defined herein shall have the same meaning as in the Loan Agreement. 
  
 2. DESCRIPTION OF COLLATERAL. Repayment of the Obligations is secured by: (i) the
Collateral as described in the Loan Agreement, and (ii) the Intellectual Property Collateral as described in certain Intellectual Property Security Agreements each dated September 28, 2005 (singly and collectively, the “IP
Agreement”) by Borrower in favor of Bank (together with any other collateral security granted to Bank, the “Security Documents”). 
  
 Hereinafter, the Security Documents, together with all other documents evidencing or securing the Obligations shall be referred to as the “Existing Loan
Documents”. 
  
 3. DESCRIPTION OF CHANGE
IN TERMS. 
  
 Modification to Loan
Agreement. 
  
 Section 5a. of the Schedule to the Loan
Agreement is hereby amended by deleting the following text appearing therein: 
  
 “a. Minimum Tangible Net Worth: 
  
 Borrower shall maintain a Tangible Net Worth of not less than the amounts set forth below: 
  

	 	(a)	($500,000.00), from the date of this Agreement through September 30, 2005; 

	 	(b)	($1,250,000.00), from October 1, 2005 through October 31, 2005; 

	 	(c)	($1,500,000.00), from November 1, 2005 through November 30, 2005; 

	 	(d)	($600,000.00), from December 1, 2005 through December 31, 2005; 

	 	(e)	($1,000,000.00), from January 1, 2006 through January 31, 2006; 

	 	(f)	($1,000,000.00), from February 1, 2006 through February 28, 2006; and 

	 	(g)	$500,000.00, from March 1, 2006 through March 31, 2006.” 

  
 and substituting the following text therefor: 
  

	 	“a.	Minimum Tangible Net Worth: 

 Borrower shall maintain a Tangible Net Worth of not less than the amounts set forth below: 

 

	 	(a)	($6,000,000.00), from October 1, 2005 through October 31, 2005; 

	 	(b)	($6,250,000.00), from November 1, 2005 through November 30, 2005; 

	 	(c)	($5,350,000.00), from December 1, 2005 through December 31, 2005; 

	 	(d)	($5,750,000.00), from January 1, 2006 through January 31, 2006; 

	 	(e)	($5,750,000.00), from February 1, 2006 through February 28, 2006; and 

	 	(f)	($4,250,000.00), from March 1, 2006 through March 31, 2006.” 

  
 4. FEES. Borrower shall reimburse Bank for all legal fees and expenses previously incurred in connection with its loan arrangement with Borrower and all legal fees
and expenses incurred in connection with this amendment to the Existing Loan Documents. 
  
 5. RATIFICATION OF INTELLECTUAL PROPERTY SECURITY AGREEMENT. Borrower hereby ratifies, confirms and reaffirms, all and singular, the terms and conditions IP Agreement, and acknowledges, confirms and agrees that the IP Agreement
contains an accurate and complete listing of all Intellectual Property Collateral as defined the IP Agreement. 
  
 6. RATIFICATION OF PERFECTION CERTIFICATE. Borrower hereby ratifies, confirms and reaffirms, all and singular, the terms and disclosures contained in a certain Perfection Certificates each dated as of
September 28, 2005 between Borrower and Bank, and acknowledges, confirms and agrees the disclosures and information above Borrower provided to Bank in the Perfection Certificates has not changed, as of the date hereof, with the exception of the
change of the Borrower’s chief executive office to One Memorial Drive, Cambridge, Massachusetts. 
  
 7. CONSISTENT CHANGES. The Existing Loan Documents are hereby amended wherever necessary to reflect the changes described above. 
  
 8. RATIFICATION OF LOAN DOCUMENTS. Borrower hereby ratifies, confirms, and reaffirms all terms and conditions of all security or
other collateral granted to the Bank, and confirms that the indebtedness secured thereby includes, without limitation, the Obligations. 
  
 9. NO DEFENSES OF BORROWER. Borrower hereby acknowledges and agrees that Borrower has no offsets, defenses, claims, or counterclaims against Bank with respect to
the Obligations, or otherwise, and that if Borrower now has, or ever did have, any offsets, defenses, claims, or counterclaims against Bank, whether known or unknown, at law or in equity, all of them are hereby expressly WAIVED and Borrower hereby
RELEASES Bank from any liability thereunder. 
  
 10. CONTINUING VALIDITY.
Borrower understands and agrees that in modifying the existing Obligations, Bank is relying upon Borrower’s representations, warranties, and agreements, as set forth in the Existing Loan Documents. Except as expressly modified pursuant to this
Loan Modification Agreement, the terms of the Existing Loan Documents remain unchanged and in full force and effect. Bank’s agreement to modifications to the existing Obligations pursuant to this Loan Modification Agreement in no way shall
obligate Bank to make any future modifications to the Obligations. Nothing in this Loan Modification Agreement shall constitute a satisfaction of the Obligations. It is the intention of Bank and Borrower to retain as liable parties all makers of
Existing Loan Documents, unless the party is expressly released by Bank in writing. No maker will be released by virtue of this Loan Modification Agreement. 

 11. JURISDICTION/VENUE. Borrower accepts for itself and in connection with its properties, unconditionally, the
exclusive jurisdiction of any state or federal court of competent jurisdiction in the Commonwealth of Massachusetts in any action, suit, or proceeding of any kind against it which arises out of or by reason of this Loan Modification Agreement;
provided, however, that if for any reason Bank cannot avail itself of the courts of the Commonwealth of Massachusetts, then venue shall lie in Santa Clara County, California. NOTWITHSTANDING THE FOREGOING, THE BANK SHALL HAVE THE RIGHT TO BRING ANY
ACTION OR PROCEEDING AGAINST THE BORROWER OR ITS PROPERTY IN THE COURTS OF ANY OTHER JURISDICTION WHICH THE BANK DEEMS NECESSARY OR APPROPRIATE IN ORDER TO REALIZE ON THE COLLATERAL OR TO OTHERWISE ENFORCE THE BANK’S RIGHTS AGAINST THE BORROWER
OR ITS PROPERTY. 
  
 12. COUNTERSIGNATURE. This Loan Modification Agreement
shall become effective only when it shall have been executed by Borrower and Bank. 
  
 [signature page follows] 

 This Loan Modification Agreement is executed as a sealed instrument under the laws of the Commonwealth of
Massachusetts as of the date first written above. 
  

									
	 BORROWER:
  
 ARTISOFT, INC.
	 	 	 	 BANK:
  
 SILICON VALLEY BANK, doing business as
 SILICON VALLEY EAST

					
	By:	 	 /s/ Duncan G. Perry
	 	 	 	By:	 	 /s/ Michael Tramack

									
					
	Name:	 	 Duncan G. Perry
	 	 	 	Name:	 	 Michael Tramack

					
	Title:	 	 Vice President & Chief Financial Officer
	 	 	 	Title:	 	 Vice President

									
			
	 VERTICAL COMMUNICATIONS ACQUISITION
 CORP.
	 	 	 	 
					
	By:	 	 /s/ Duncan G. Perry
	 	 	 	 	 	 
					
	Name:	 	 Duncan G. Perry
	 	 	 	 	 	 
					
	Title:	 	 Vice President

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