Exhibit 32.2

CERTIFICATION OF PRINCIPAL FINANCIAL OFFICER

PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of RingCentral, Inc. (the “Company”) on Form 10-K for the annual period ended December 31, 2015 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Clyde Hosein, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: February 29, 2016	/s/ Clyde Hosein
	Clyde Hosein Executive Vice President and Chief Financial Officer (Principal Financial Officer)