EXHIBIT 5.1

MILBANK, TWEED, HADLEY & McCLOY LLP 1 CHASE MANHATTAN PLAZA
LOS ANGELES 213-892-4000 FAX: 213-629-5063 WASHINGTON, D.C. 202-835-7500 FAX: 202-835-7586 LONDON 44-20-7615-3000 FAX: 44-20-7615-3100 FRANKFURT 49-(0)69-71914-3400 FAX: 49-(0)69-71914-3500 MUNICH 49-89-25559-3600 FAX: 49-89-25559-3700	NEW YORK, NY 10005-1413 _________ Telephone: 212-530-5000 Fax: 212-530-5219	BEIJING 8610-5969-2700 FAX: 8610-5969-2707 HONG KONG 852-2971-4888 FAX: 852-2840-0792 SINGAPORE 65-6428-2400 FAX: 65-6428-2500 TOKYO 813-5410-2801 FAX: 813-5410-2891 SÃO PAULO 55-11-2787-6282 FAX: 55-11-2787-6469

October 5, 2011

Comverse Technology, Inc.

810 Seventh Avenue, 32nd Floor

New York, NY 10019

Re: Registration Statement on Form S-8 relating to the issuance of Common Stock under the Plans

Ladies and Gentlemen:

We refer to the Registration Statement on Form S-8 (the “Registration Statement”) which Comverse Technology, Inc., a New York corporation (the “Company”), proposes to file with the Securities and Exchange Commission for the purpose of registering under the Securities Act of 1933, as amended, up to 9,006,993 common shares of the Company, par value $0.10 per share (the “Shares”), issued, or issuable upon the exercise of options issued, under and pursuant to the following plans: (i) Boston Technology, Inc. 1994 Stock Incentive Plan, (ii) Boston Technology, Inc. Amended and Restated 1996 Stock Incentive Plan, (iii) Comverse Technology, Inc. 1994 Stock Option Plan, (iv) Comverse Technology, Inc. 1995 Stock Option Plan, (v) Comverse Technology, Inc. 1996 Stock Option Plan, (vi) Comverse Technology, Inc. 1997 Stock Incentive Compensation Plan, (vii) Comverse Technology, Inc. 1999 Stock Incentive Compensation Plan, (viii) Comverse Technology, Inc. 2000 Stock Incentive Compensation Plan, and (ix) Comverse Technology, Inc. 2001 Stock Incentive Compensation Plan (the “Plans”).

We have examined originals, or copies certified to our satisfaction, of such corporate records of the Company, agreements and other instruments, certificates of public officials, certificates of officers and representatives of the Company and other documents as we have deemed it necessary as a basis for the opinions hereinafter expressed. In such examination we have assumed the genuineness of all signatures, the authenticity of all documents submitted to us as originals, the conformity with the original documents of all documents submitted to us as copies and the authenticity of the originals of such latter documents. As to various questions of

fact material to such opinions we have, when relevant facts were not independently established, relied upon certifications by officers of the Company and other appropriate persons and statements contained in the Registration Statement.

Based upon the foregoing, and having regard to legal considerations which we deem relevant, we are of the opinion that the issuance of the Shares pursuant to the Plans has been duly authorized and, when issued and delivered upon receipt by the Company of consideration constituting lawful consideration under New York law in accordance with the relevant Plan, the Shares will have been legally and validly issued, fully paid and non-assessable.

We hereby consent to the filing of this opinion as Exhibit 5.1 to the Registration Statement. In giving such opinion, we do not thereby admit that we are acting within the category of persons whose consent is required under Section 7 of the Securities Act of 1933, or the rules or regulations of the Securities and Exchange Commission thereunder.

Very truly yours,

/s/ Milbank, Tweed, Hadley & McCloy LLP