Ownership Submission
FORM 3
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
  LAVINE JONATHAN S
2. Date of Event Requiring Statement (Month/Day/Year)
05/23/2006
3. Issuer Name and Ticker or Trading Symbol
VONAGE HOLDINGS CORP [VG]
(Last)
(First)
(Middle)
C/O SANKATY ADVISORS, LLC, 111 HUNTINGTON AVENUE
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director __X__ 10% Owner
_____ Officer (give title below) _____ Other (specify below)
5. If Amendment, Date Original Filed(Month/Day/Year)
(Street)

BOSTON, MA 02199
6. Individual or Joint/Group Filing(Check Applicable Line)
___ Form filed by One Reporting Person
_X_ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Beneficially Owned
1.Title of Security
(Instr. 4)
2. Amount of Securities Beneficially Owned
(Instr. 4)
3. Ownership Form: Direct (D) or Indirect (I)
(Instr. 5)
4. Nature of Indirect Beneficial Ownership
(Instr. 5)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 4)
2. Date Exercisable and Expiration Date
(Month/Day/Year)
3. Title and Amount of Securities Underlying Derivative Security
(Instr. 4)
4. Conversion or Exercise Price of Derivative Security 5. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 5)
6. Nature of Indirect Beneficial Ownership
(Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
1) Series E Convertible Preferred Stock   (1)   (1) Common stock, par value $0.001 per share 2,695,824 $ (1) I See Footnotes (2) (3) (4)
2) Senior Unsecured Convertible Notes 12/16/2005 12/01/2010 Common stock, par value $0.001 per share 1,604,899 (5) $ 14.22 I See Footnotes (2) (3) (4)

Reporting Owners

Reporting Owner Name / Address Relationships
Director 10% Owner Officer Other
LAVINE JONATHAN S
C/O SANKATY ADVISORS, LLC
111 HUNTINGTON AVENUE
BOSTON, MA 02199
    X    
SANKATY CREDIT OPPORTUNITIES LP
111 HUNTINGTON AVENUE
BOSTON, MA 02199
    X    
Sankaty Credit Opportunities Investors, LLC
111 HUNTINGTON AVENUE
BOSTON, MA 02199
    X    
SANKATY CREDIT MEMBER, LLC
111 HUNTINGTON AVENUE
BOSTON, MA 02199
    X    
PROSPECT HARBOR CREDIT PARTNERS LP
111 HUNTINGTON AVENUE
BOSTON, MA 02199
    X    
PROSPECT HARBOR INVESTORS, LLC
111 HUNTINGTON AVENUE
BOSTON, MA 02199
    X    
SANKATY HIGH YIELD PARTNERS III L P
111 HUNTINGTON AVENUE
BOSTON, MA 02199
    X    
Sankaty High Yield Asset Investors III, LLC
111 HUNTINGTON AVENUE
BOSTON, MA 02199
    X    
SANKATY INVESTORS III, LLC
111 HUNTINGTON AVENUE
BOSTON, MA 02199
    X    
SANKATY HIGH YIELD PARTNERS II L P
111 HUNTINGTON AVENUE
BOSTON, MA 02199
    X    

Signatures

/s/ Jonathan S. Lavine 05/23/2006
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 5(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) The convertible preferred stock is immediately convertible on a 1:2.86 basis and has no expiration date. The convertible preferred stock automatically converts to Common Stock upon the closing of the offering.
(2) Shares include (i) (a) 673,957 shares issuable upon conversion of preferred stock, and (b) 241,091 shares issuable upon conversion of convertible notes owned by Sankaty Credit Opportunities, L.P. ("SCO"), whose sole general partner is Sankaty Credit Opportunities Investors, LLC ("SCI"), whose managing member is Sankaty Credit Member, LLC ("SCM"), (ii) (a) 1,752,285 shares issuable upon conversion of preferred stock, and (b) 505,009 shares issuable upon conversion of convertible notes owned by Sankaty Credit Opportunities II, L.P. ("SCO II"), whose sole general partner is Sankaty Credit Opportunities Investors II, LLC ("SCI II"), whose managing member is SCM, (iii) (a) 269,582 shares issuable upon conversion of preferred stock, and (b) 472,197 shares issuable upon conversion of convertible notes owned by Prospect Harbor Credit Partners, L.P. ("PH"), whose sole general partner is Prospect Harbor Investors, LLC ("PHI"), (Continued to Footnote 3)
(3) whose managing member is SCM; (iv) 235,385 shares issuable upon conversion of convertible notes owned by Sankaty High Yield Partners II, L.P., whose sole general partner is Sankaty High Yield Asset Investors II, LLC ("SHYA II"), whose sole managing member is Sankaty Investors II, LLC ("SI II"); and (v) 151,217 shares issuable upon conversion of convertible notes owned by Sankaty High Yield Partners III, L.P, whose sole general partner is Sankaty High Yield Asset Investors III, LLC ("SYHA III"), whose sole managing member is Sankaty Investors III, LLC ("SI III"). Jonathan S. Lavine is the managing member of each of SCM, SI II and SI III. Mr. Lavine and the entities listed above other than record holders of the shares listed above may each be deemed to share voting and dispositive power with respect to these shares, but each disclaims beneficial ownership of such shares except to the extent of their pecuniary interests therein.
(4) Following consummation of the Issuer's initial public offering, the reporting persons herein will cease to hold, directly or indirectly, more than 10% of any class of any equity security of the issuer (determined in accordance with the rules for determining beneficial ownership under Section 13(d) of the Securities Exchange Act of 1934, as amended (the "Exchange Act")) and therefore will no longer be subject to the disclosure and other requirements of Section 16 of the Exchange Act.
(5) Additional shares may be issuable upon conversion of the notes if the Issuer elects to pay interest on the notes in kind by increasing the principal outstanding under the notes.

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