CUSIP No. 903844207

EXHIBIT A

AGREEMENT

JOINT FILING OF SCHEDULE 13G

The undersigned hereby agree to jointly prepare and file with regulatory authorities a Schedule 13G and any future amendments thereto reporting each of the undersigned’s ownership of securities, and hereby affirm that such Schedule 13G is being filed on behalf of each of the undersigned pursuant to and in accordance with the provisions of Rule 13d-1(k) under the Securities Exchange Act of 1934. The undersigned acknowledge that each shall be responsible for the timely filing of such amendments, and for the completeness and accuracy of the information concerning him or it contained therein, but shall not be responsible for the completeness and accuracy of the information concerning the other, except to the extent that he or it knows or has reason to believe that such information if inaccurate.

Dated: February 11, 2011


	S Squared Technology, LLC
	By:	/s/ Seymour L. Goldblatt
		Seymour L. Goldblatt
		President

	S Squared Technology Partners, L.P.
	By:	/s/ Seymour L. Goldblatt
		Seymour L. Goldblatt
		President


	/s/ Seymour L. Goldblatt
	Seymour L. Goldblatt

	/s/ Kenneth A. Goldblatt
	Kenneth A. Goldblatt

Page 10 of 10 pages

ULTICOM, INC SC 13G/A