EXHIBIT 32.1
CERTIFICATION OF INTERIM CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER
PURSUANT TO
18 U.S.C. SECTION 1350,
AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002
I, Jeffrey Citron, certify to my knowledge pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge, the Quarterly Report of Vonage Holdings Corp. on Form 10-Q/A for the quarterly period ended September 30, 2007, fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that information contained in such Form 10-Q/A fairly presents, in all material respects, the financial condition and results of operations of Vonage Holdings Corp.
| Date: March 17, 2008 | /s/ JEFFREY CITRON | |
| Jeffrey Citron | ||
| Chairman, Chief Strategist and Interim Chief Executive Officer |
I, John S. Rego, certify to my knowledge pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge, the Quarterly Report of Vonage Holdings Corp. on Form 10-Q/A for the quarterly period ended September 30, 2007, fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that information contained in such Form 10-Q/A fairly presents, in all material respects, the financial condition and results of operations of Vonage Holdings Corp.
| Date: March 17, 2008 | /s/ JOHN S. REGO | |
| John S. Rego | ||
| Executive Vice President, Chief Financial Officer and Treasurer |
