**Exhibit 4.5**

**SUPPLEMENTAL INDENTURE**

Supplemental Indenture (this “Supplemental Indenture”), dated as of February 19, 2010, among Avaya Government Solutions Inc., aDelaware corporation, Integrated Information Technology Corporation, an Illinois corporation, and AC Technologies, Inc., a Delaware corporation (each a “Guaranteeing Subsidiary”), each a direct or indirect subsidiary of Avaya Inc.,a Delaware corporation (the “Issuer”), and The Bank of New York Mellon, as trustee (the “Trustee”). 

W I T N E S S E T H 

WHEREAS,each of Avaya Inc. and the Guarantors (as defined in the Indenture referred to below) has heretofore executed and delivered to the Trustee an Exchange Note Indenture (the “Indenture”), dated as of October 24, 2008, providingfor the issuance of an unlimited aggregate principal amount of 9.75% Senior Notes due 2015 (the “Cash Pay Notes”) and 10.125% / 10.875% Senior PIK Toggle Notes due 2015 (the “PIK Toggle Notes” and together with theCash Pay Notes, the “Notes”); 

WHEREAS, the Indenture provides that under certain circumstances each Guaranteeing Subsidiaryshall execute and deliver to the Trustee a supplemental indenture pursuant to which such Guaranteeing Subsidiary shall unconditionally guarantee all of the Issuer’s Obligations under the Notes and the Indenture on the terms and conditions setforth herein and under the Indenture (the “Guarantee”); and 

WHEREAS, pursuant to Section 9.01 of the Indenture, theTrustee is authorized to execute and deliver this Supplemental Indenture. 

NOW THEREFORE, in consideration of the foregoing and for other goodand valuable consideration, the receipt of which is hereby acknowledged, the parties mutually covenant and agree for the equal and ratable benefit of the Holders of the Notes as follows: 

(1) Capitalized Terms. Capitalized terms used herein without definition shall have the meanings assigned to them in the Indenture. 

(2) Agreement to Guarantee. Each Guaranteeing Subsidiary hereby agrees to provide an unconditional Guarantee on the terms and subject to theconditions set forth in the Indenture including but not limited to Article 10 thereof. 

(3) No Recourse Against Others. No past,present or future director, officer, employee, incorporator, member, partner or stockholder of the Issuer or any Guarantor or any of their direct or indirect parent companies (other than the Issuer and any Guarantor) shall have any liability for anyobligations of the Issuer or the Guarantors under the Notes, the Guarantees or the Indenture or for any claim based on, in respect of, or by reason of such obligations or their creation. Each Holder by accepting Notes waives and releases all suchliability. The waiver and release are part of the consideration for issuance of the Notes. 

(4) Governing Law. THIS SUPPLEMENTALINDENTURE WILL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK. 

(5) Counterparts. The parties maysign any number of copies of this Supplemental Indenture. Each signed copy shall be an original, but all of them together represent the same agreement. 

(6) Effect of Headings. The Section headings herein are for convenience only and shall not affect the construction hereof. 

(7) The Trustee. The Trustee shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of thisSupplemental Indenture or for or in respect of the recitals contained herein, all of which recitals are made solely by each Guaranteeing Subsidiary. 

IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly executed, all asof the date first above written. 

 
AVAYA GOVERNMENT SOLUTIONS INC.By: 
/s/ Matthew Booher
Name: Matthew BooherTitle: Treasurer
INTEGRATED INFORMATION TECHNOLOGY CORPORATION
By: 
/s/ Matthew Booher
Name: Matthew BooherTitle: TreasurerAC TECHNOLOGIES, INC.By: 
/s/ Matthew Booher
Name: Matthew BooherTitle: TreasurerTHE BANK OF NEW YORK MELLON, as TrusteeBy: 
/s/ Christopher Greene
Name: Christopher GreeneTitle: Vice President