CUSIP No.		13100M509

EXHIBIT A

AGREEMENT OF JOINT FILING

Pursuant to Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree that only one statement containing the information required by Schedule 13G need be filed with respect to the ownership by each of the undersigned of the shares of Common Stock of Calix, Inc.

This Agreement may be executed in any number of counterparts, each of which shall be deemed an original.

EXECUTED as of this 14th day of February, 2011.

		AZURE VENTURE PARTNERS I, L.P.
		By:		Azure Capital Partners VC Administrators, LLC, its general partner
				By:		/s/ Paul Ferris
						Name: Paul Ferris
						Title:   Manager
		AZURE VENTURES I, L.P.
		By:		Azure Capital Partners VC Administrators, LLC, its general partner
				By:		/s/ Paul Ferris
						Name: Paul Ferris
						Title:   Manager
		AZURE PARTNERS I, L.P.
		By:		Azure Capital Partners CO Administrators, LLC, its general partner
				By:		/s/ Paul Ferris
						Name: Paul Ferris
						Title:   Manager
		AZURE I, L.P.
		By:		Azure Capital Partners CO Administrators, LLC, its general partner
				By:		/s/ Paul Ferris
						Name: Paul Ferris
						Title:   Manager

CUSIP No.		13100M509

		AZURE CAPITAL PARTNERS VC ADMINISTRATORS, LLC
		By:		/s/ Paul Ferris
				Name: Paul Ferris
				Title:   Manager
		AZURE CAPITAL PARTNERS CO ADMINISTRATORS, LLC
		By:		/s/ Paul Ferris
				Name: Paul Ferris
				Title:   Manager
				/s/ Paul Ferris
				Paul Ferris
				/s/ Michael Kwatinetz
				Michael Kwatinetz
				/s/ Cameron Lester
				Cameron Lester
				/s/ Paul Weinstein
				Paul Weinstein