ASSIGNMENT AND NOVATION AGREEMENT No. 53258.M.001

Exhibit 4.a.3

CONFIDENTIAL TREATMENT REQUESTED UNDER RULE 24b-2 UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED.

[***] INDICATES OMITTED MATERIAL THAT IS THE SUBJECT OF A CONFIDENTIAL TREATMENT REQUEST FILED SEPARATELY WITH THE COMMISSION. THE OMITTED MATERIAL HAS BEEN FILED SEPARATELY WITH THE COMMISSION.

ASSIGNMENT AND NOVATION AGREEMENT

No. 53258.M.001

THIS ASSIGNMENT AND NOVATION AGREEMENT (this “Agreement”) is made as of September 30, 2018, by and between Amdocs, Inc., a Delaware corporation (“Assignor”), and Amdocs Development Limited, a Cyprus corporation (“Assignee”), and AT&T Services, Inc., a Delaware corporation (“AT&T”).

WHEREAS, Assignor and AT&T are parties to the Master Services Agreement Number 53258.C, dated February 28, 2017 (the “MSA”); and

WHEREAS, Assignor desires to transfer and assign to Assignee its rights, duties and obligations under the MSA and all Orders entered into thereunder or subject thereto, as more fully set forth on SCHEDULE A hereto (the “Assigned Orders”); and

WHEREAS, Assignee desires to acquire the MSA and Assigned Orders from Assignor on the terms and conditions hereinafter set forth; and

WHEREAS, Assignor desires to be discharged from the performance of the obligations enumerated in the MSA and Assigned Orders; and

WHEREAS, AT&T is willing as of the effective date of this Agreement to release Assignor from the obligations enumerated in the MSA and Assigned Orders and to consent to Assignee assuming such obligations;

NOW THEREFORE, in consideration of the mutual premises and covenants herein contained, and for good and valuable consideration, the receipt and sufficiency of which is hereby acknowledged, the parties agree for themselves, their successors and assigns, as follows:

CONFIDENTIAL TREATMENT REQUESTED UNDER RULE 24b-2 UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED.

[***] INDICATES OMITTED MATERIAL THAT IS THE SUBJECT OF A CONFIDENTIAL TREATMENT REQUEST FILED SEPARATELY WITH THE COMMISSION. THE OMITTED MATERIAL HAS BEEN FILED SEPARATELY WITH THE COMMISSION.

Assignment Agreement No. 53258.M.001

IN WITNESS WHEREOF, the undersigned have executed this Agreement as of the date first written above.

Pursuant to Article 3.4 of the MSA, AT&T hereby approves, as of the Effective Date, the assignment and assumption of the MSA and Assigned Orders, as set forth in the foregoing Agreement, and agrees to the release of Assignor in paragraph (2) above and the novation of the MSA and Assigned Orders in paragraph (3) above.

CONFIDENTIAL TREATMENT REQUESTED UNDER RULE 24b-2 UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED.

[***] INDICATES OMITTED MATERIAL THAT IS THE SUBJECT OF A CONFIDENTIAL TREATMENT REQUEST FILED SEPARATELY WITH THE COMMISSION. THE OMITTED MATERIAL HAS BEEN FILED SEPARATELY WITH THE COMMISSION.

Assignment Agreement No. 53258.M.001

SCHEDULE A – ASSIGNED ORDERS

CONFIDENTIAL TREATMENT REQUESTED UNDER RULE 24b-2 UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED.

[***] INDICATES OMITTED MATERIAL THAT IS THE SUBJECT OF A CONFIDENTIAL TREATMENT REQUEST FILED SEPARATELY WITH THE COMMISSION. THE OMITTED MATERIAL HAS BEEN FILED SEPARATELY WITH THE COMMISSION.

Assignment Agreement No. 53258.M.001

CONFIDENTIAL TREATMENT REQUESTED UNDER RULE 24b-2 UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED.

[***] INDICATES OMITTED MATERIAL THAT IS THE SUBJECT OF A CONFIDENTIAL TREATMENT REQUEST FILED SEPARATELY WITH THE COMMISSION. THE OMITTED MATERIAL HAS BEEN FILED SEPARATELY WITH THE COMMISSION.

Assignment Agreement No. 53258.M.001

CONFIDENTIAL TREATMENT REQUESTED UNDER RULE 24b-2 UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED.

[***] INDICATES OMITTED MATERIAL THAT IS THE SUBJECT OF A CONFIDENTIAL TREATMENT REQUEST FILED SEPARATELY WITH THE COMMISSION. THE OMITTED MATERIAL HAS BEEN FILED SEPARATELY WITH THE COMMISSION.

Assignment Agreement No. 53258.M.001

CONFIDENTIAL TREATMENT REQUESTED UNDER RULE 24b-2 UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED.

[***] INDICATES OMITTED MATERIAL THAT IS THE SUBJECT OF A CONFIDENTIAL TREATMENT REQUEST FILED SEPARATELY WITH THE COMMISSION. THE OMITTED MATERIAL HAS BEEN FILED SEPARATELY WITH THE COMMISSION.

Assignment Agreement No. 53258.M.001

CONFIDENTIAL TREATMENT REQUESTED UNDER RULE 24b-2 UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED.

[***] INDICATES OMITTED MATERIAL THAT IS THE SUBJECT OF A CONFIDENTIAL TREATMENT REQUEST FILED SEPARATELY WITH THE COMMISSION. THE OMITTED MATERIAL HAS BEEN FILED SEPARATELY WITH THE COMMISSION.

Assignment Agreement No. 53258.M.001

CONFIDENTIAL TREATMENT REQUESTED UNDER RULE 24b-2 UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED.

[***] INDICATES OMITTED MATERIAL THAT IS THE SUBJECT OF A CONFIDENTIAL TREATMENT REQUEST FILED SEPARATELY WITH THE COMMISSION. THE OMITTED MATERIAL HAS BEEN FILED SEPARATELY WITH THE COMMISSION.

Assignment Agreement No. 53258.M.001

CONFIDENTIAL TREATMENT REQUESTED UNDER RULE 24b-2 UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED.

[***] INDICATES OMITTED MATERIAL THAT IS THE SUBJECT OF A CONFIDENTIAL TREATMENT REQUEST FILED SEPARATELY WITH THE COMMISSION. THE OMITTED MATERIAL HAS BEEN FILED SEPARATELY WITH THE COMMISSION.

Assignment Agreement No. 53258.M.001