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