Document:

20-F

Exhibit 4.30  

AMENDMENT #3 

TO 

OEM PURCHASE AND SALE
AGREEMENT NO. 011449 

BETWEEN SELLER
CORPORATION AND NORTEL NETWORKS LIMITED 

This Amendment #2 to OEM Purchase and
Sale Agreement No. 011449 by and between Nortel Networks Limited, a Canada
corporation with offices located at 8200 Dixie Road, Suite 100, Brampton, Ontario, Canada
L6T 5P6 (Nortel Networks) and AudioCodes Ltd., an Israeli corporation with offices located
at 1 Hayarden Street, Airport City Lod, 70151 (Seller), will be effective as of February
15, 2005. 

WHEREAS, Nortel Networks and Seller
entered into an OEM Purchase and Sale Agreement dated April 28, 2003, as amended
(“Agreement”); and 

WHEREAS, Nortel Networks and Seller
wish to amend the Agreement for the purposes of adding an OEM Interface License to the
Agreement to address interoperability issues with regard to certain Products
described therein; 

Now, therefore, the parties agree to
amend the Agreement as follows: 

     	A.	
          Add Exhibit N, “OEM Interface License” to the Agreement, attached to
          and incorporated in this Amendment 3 as Attachment. 

          

Except for this Amendment No. 3, in
all other respects the Agreement shall remain unchanged. 

IN WITNESS WHEREOF, the parties have
caused this Amendment No. 3 to the Agreement to be signed by their duly authorized
representatives. 

	NORTEL NETWORKS LIMITED

By: /s/ Nancy Scott
——————————————

Print Name: Nancy Scott
Title: SR Mgr. Supply Mgmt.

Date: February 3, 2005		AUDIOCODES LTD.

By: /s/ Ben Rabinowitz
——————————————

Print Name: Ben Rabinowitz 
Title: VP Marketing and Sales, NA

Date: February 15, 2005

Page 1 OF 6

EXHIBIT N  

OEM INTERFACE LICENSE  

1.    DEFINITIONS.
Capitalized terms that are defined in the Agreement (as           defined below)
shall have the meanings set forth in the Agreement, and the           following
capitalized terms, and other capitalized terms defined elsewhere in           this
Exhibit (“Exhibit”),will have the meanings set           forth
herein wherever used in this Exhibit:  

     	(a)	
          “Agreement” means the parties’ OEM Purchase and Sale
          Agreement to which this Exhibit is attached, but solely to the extent such
          Agreement is applicable to Product(s) that are required to incorporate an
          Interface pursuant thereto. 

          

     	(b)	
          “Field of Use” means use of an Interface solely in a Product
          provided exclusively to Nortel Networks  solely for enabling such Product
          to interface with a System solely in accordance with the Technical Information
          and solely as and to the extent required pursuant to the Agreement. 

          

     	(c)	
          “Interface” means an interface that incorporates and uses a
          Nortel Networks Interface to enable interoperation exclusively between a System
          and a Product solely in accordance with such Technical Information. 

          

     	(d)	
          “Interface Improvements” means any innovations, improvements,
          enhancements, modifications and other derivatives of, and/or directed to,
          associated with and/or resulting from use of Technical Information and/or
          a Nortel Networks Interface, made or created by or for Seller, but, with
          respect to Technical Information, only to the extent primarily directed to
          and/or based on such Technical Information, or with respect to a Nortel Networks
          Interface, only to the extent related specifically to such Nortel Networks
          Interface. 

          

     	(e)	
          “Nortel Networks Interface” means the System interface
          described in the Technical Information. 

          

     	(f)	
          “Seller Improvements” means any innovations, improvements,
          enhancements, modifications and other derivatives to, and/or directed to,
          associated with and/or arising from Seller’s activities pursuant to and in
          accordance with the terms of this Agreement, excluding any Interface
          Improvements. 

          

     	(g)	
          “System” means only the Nortel Networks products listed in
          Exhibit N-1 and future releases thereof during the Term. 

          

     	(h)	
          “Technical Information” means the information contained in the
          specific versions of the document(s) listed in Exhibit N-1, including updates
          thereto and any other related technical information that may, at Nortel Networks
          sole discretion, be provided by Nortel Networks to Seller during the Term. 

          

Page 1 OF 6

     	(i)	
          “Technical Information IPR” means the intellectual property
          rights owned by Nortel Networks specifically directed to and covering the
          Technical Information, and its use solely in accordance with and specifically
          limited by the terms of(.) this Exhibit, solely to the extent of the
          Technical Information. 

          

2.    LICENSES 

2.1    Grant
of License. Subject to the terms and conditions of the Agreement, and during the
Term, Nortel Networks, and/or Nortel Networks Limited and/or its Subsidiaries, to the
extent of its legal right to do so, grants to Seller a personal, non-exclusive,
non-transferable, non-sublicensable license under the Technical Information IPR:  

     	(a)	
          to use (including copy) the Technical Information: 

          

	 	(i) 	to
develop and make interfaces solely for incorporation and use in Products           solely
within the Field of Use and solely to the extent necessary to perform           Seller’s
obligations pursuant to the Agreement;  

	 	(ii) 	to
incorporate such Interfaces into Products in accordance with rights set forth
          in section 2.1(a)(i) and solely to the extent necessary to perform Seller’s
          obligations pursuant to the Agreement;  

	 	(iii) 	to
support and maintain such Interfaces incorporated into Products in accordance
          with the Field of Use in accordance with rights set forth in section 2.1(a)(i)
          and solely to the extent necessary to perform Seller’s obligations
pursuant           to the Agreement; and  

     	(b)	
          to use Interfaces incorporated in Products, solely to the extent of such
          Interfaces, solely within the Field of Use a nd to the extent necessary to
          perform Seller’s obligations pursuant to the Agreement. 

          

2.2    Prohibited
Uses. Technical Information shall not be used to reverse engineer any Nortel Networks
Interface existing in or for any product, device or system of any kind, and shall not be
used to implement an Interface in or with any product, device or system of any kind,
including hardware and software, except for a Product solely within the Field of Use, or
in or with any of Seller’s products outside the Field of Use. Seller shall not
create or distribute any Interface in software that is subject to the GNU General Public
License, or any similar “open source” license, that would grant third parties
the right to receive the source code, or the object code of such Interface to the extent
to which it incorporates the source code of such Interface, other than as permitted under
this Agreement.  

2.3    Grant
Back License. Seller hereby agrees to grant to Nortel Networks an irrevocable,
perpetual, non-exclusive, sublicensable, fully paid-up, royalty-free, worldwide license,
under any and all of Seller’s intellectual property rights, to utilize, employ,
practice and/or otherwise exploit any and all Seller Improvements. The preceding sentence
does not obligate Seller to disclose or provide Seller improvements to Nortel Networks.  

Page 2 OF 6

3.     OWNERSHIP
AND RESERVATION OF RIGHTS  

3.1    Ownership.
The Technical Information, including,all copies thereof (including any and all portions
thereof), and the Technical Information IPR are and shall continue to be owned
exclusively by Nortel Networks. All Seller Improvements, and any intellectual property
rights associated therewith, shall be owned exclusively by Seller. Notwithstanding the
prior sentence, Nortel Networks shall exclusively own all Interface Improvements, and any
intellectual property rights associated therewith to the extent such intellectual
property rights are directed to and/or based on Technical Information and/or to the
extent such intellectual property rights are related specifically to a Nortel Networks
Interface. Seller shall disclose any such Interface Improvements to Nortel Networks in
writing upon its conception and upon the reduction of such Interface Improvement to a
detailed description, and shall take whatever reasonable steps may be necessary to assign
the ownership ofsuch Interface Improvements to Nortel Networks Nortel Networks
grants Seller a personal, non-exclusive, non-transferable, non-sublicensable right to use
Interface Improvements in the course of Seller’s exercise of, and solely to the
extent of, the rights granted to Seller under Section 2.1 of this Agreement.  

3.2    No
Other Rights. Nortel Networks reserves all rights and licenses not expressly granted
in this Agreement. Nothing in this Agreement shall be construed as implying or giving
rise to any implied grant or license including any right to use a Product incorporating
an Interface except to use such Interface incorporated therein solely in accordance with
the Field of Use or any right to use an interface in combination with anything else
except as expressly set forth in Section 2.1. Nothing contained in this Agreement shall
be construed as conferring on (i) Nortel Networks an obligation to file, secure, protect,
maintain and/or enforce any intellectual property right and/or (ii) Seller any right to
bring any action on behalf of Nortel Networks and/or based an or related to the Technical
Information or the Technical Information IPR. Furthermore, nothing contained in this
Agreement shall limit Nortel Networks ability to use in any manner it chooses the
Technical Information or the Technical Information IPR or further license the same to any
other entity.  

3.3    Third
Party Technology/IPR. Seller acknowledges that no third party technical information
and/or intellectual property rights are licensed to it pursuant to, or as a result of,
this Exhibit. Seller shall be solely responsible for obtaining, including any fees and/or
costs, any third party technical information and intellectual property rights it requires
with respect to its activities pursuant to this Agreement and/or associated with Products
incorporating Interfaces.  

4.     WARRANTIES;
DISCLAIMER; LIMITATION OF LIABILITY  

4.1    THE
TECHNICAL INFORMATION, NORTEL NETWORKS INTERFACE(S) AND TECHNICAL INFORMATION IPR IS
PROVIDED TO SELLER BY NORTEL NETWORKS (AND ITS SUPPLIERS/LICENSORS, IF ANY) “AS IS” WITHOUT
WARRANTY OR CONDITION OF ANY KIND. NORTEL NETWORKS (AND ITS SUPPLIERS/LICENSORS, IF ANY)
EXPRESSLY DISCLAIM ALL WARRANTIES AND CONDITIONS, STATUTORY, EXPRESS OR IMPLIED,
INCLUDING, WITHOUT LIMITATION, ANY WARRANTY OR CONDITION OF TITLE, MERCHANTABILITY,
FITNESS OR SUITABILITY FOR ANY PARTICULAR PURPOSE (EVEN IF ON NOTICE OF SUCH PURPOSE),
NON-INFRINGEMENT, CUSTOM OR USAGE IN THE TRADE WITH RESPECT TO THE TECHNICAL INFORMATION,
NORTEL NETWORKS INTERFACES AND TECHNICAL INFORMATION IPR, THE USE OR OTHER EXPLOITATION
OF THE SAME AND/OR THE RESULTS OR ITEMS RESULTING FROM SUCH USE. 

Page 3 OF 6

5.     CONFIDENTIALITY
OF TECHNICAL INFORMATION  

5.1     Any
Technical Information received by Seller pursuant to this Exhibit shall be used,
disclosed, or copied, only for the purposes of, and only in accordance with, this
Agreement. Seller shall use, as a minimum, the same degree of care as it uses to protect
its own Technical Information of a similar nature, but no less than reasonable care, to
prevent the unauthorized use, disclosure or publication of Technical Information. Without
limiting the generality of the foregoing:  

     	(a)	
          Seller shall only disclose Technical Information to its employees or any
          individual or entity which (i) has entered into a written agreement with Seller
          containing obligations of confidence substantially similar to (but no less
          protective of the Technical Information than) those contained in this Agreement
          and (ii) has a bona fide need to access the Technical Information consistent
          with the Seller’s rights under this Agreement. 

          

     	(b)	
          Seller shall not make or have made any copies of Technical Information except
          those copies which are necessary for the purposes of this Agreement; and 

          

     	(c)	
          Seller shall affix to any copies it makes of the Technical Information, all
          proprietary notices or legends affixed to the Technical Information as they
          appear on the copies of the Technical Information originally received from
          Nortel Networks. 

          

5.2    Exclusions.
Seller shall not be bound by obligations restricting disclosure set forth in this
Agreement with respect to any Technical Information which:  

     	(a)	
          without obligation of confidentiality was rightfully known by Seller prior to
          disclosure, as evidenced by its business records; 

          

     	(b)	
          was lawfully in the public domain prior to its disclosure, or lawfully becomes
          publicly available other than through a breach of this Agreement or any other
          confidentiality obligation on behalf of any third party; 

          

     	(c)	
          was disclosed to Seller by a third party provided such third party, or any other
          party from whom such third party receives such information, is not in breach of
          any confidentiality obligation in respect of such information; 

          

     	(d)	
          is independently developed by Seller, as evidenced by its business records; or 

          

     	(e)	
          is disclosed when such disclosure is compelled pursuant to legal, judicial, or
          administrative proceedings, or otherwise required by law, but solely to the
          extent required thereby, provided that Seller advises Nortel Networks of any
          such disclosure in a timely manner prior to making any such disclosure, and
          provided that Seller shall apply for such legal protection as may be available
          with respect to the confidentiality of the Technical Information which is
          required to be disclosed. 

          

Page 4 OF 6

6.    GENERAL 

6.1    Change
of Control. “Change of Control” means any agreement, resolution or
transaction to transfer or issue by sale, subscription, or any other disposition of any
part or all of the corporate shares or assets of Seller, or of any parent or subsidiary
corporation of Seller, or any corporation associated or affiliated with Seller (as those
terms are defined by corporate legislation and any amendments thereto) so as to result in
any change, from that existing as of the Effective Date, in effective control, directly
or indirectly, of Seller. Change of Control of Seller or any business unit of Seller that
has used or is using Technical Information, without the prior written consent of Nortel
Networks, shall constitute an assignment of this Exhibit and therefore be governed by
Section 6.3, Assignment, of this Exhibit.  

6.2    Return
of Technical Information. Seller shall, within thirty (30) days of termination or
expiration of the Agreement, return to Nortel Networks or, if so requested by Nortel
Networks, certify in writing to Nortel Networks that all copies of the Technical
Information have been destroyed.  

6.3    Assignment.
Seller shall not assign, or otherwise transfer the Technical Information, or its rights
under this Exhibit, nor delegate its duties or obligations under this Exhibit to any
third party in whole or part, without the prior written consent of Nortel Networks. Any
transfer by Seller of this Exhibit or any right or obligation hereunder by operation of
law, reorganization, merger, amalgamation, Change of Control of Seller or any business
unit of Seller relating to Products, or otherwise, without the prior written consent of
Nortel Networks, shall constitute an assignment for the purposes of this section. Any
purported assignment in violation of this provision shall be null and void and shall
constitute a material breach of the Agreement that is not subject to cure.  

[Remainder
of this page intentionally left blank.] 

Page 5 OF 6

EXHIBIT N-1  

1. Technical Information 

	 	[*]          	Specifications:

	 	a) 	[*] 

	 	[*]          	Specifications:

	 	a) 	[*] 

	 	b) 	[*] 

	 	c) 	[*] 

	 	d) 	[*] 

	 	e) 	[*] 

	 	f) 	[*] 

2. System(s) 

			
	Nortel Networks Products:

a) [*] 

b) [*] 

c) [*] 

d) [*] 
	Release 

[*] 

[*] 

[*] 

3.0 
	Applicable Technical Information

[*]

[*]

[*]

[*] 

* Confidential 

Page 6 OF 620-F

Exhibit 4.31  

Nortel Networks Agreement No. 011449

Nortel Networks Amendment No. 011449(5)

AMENDMENT #5 

TO 

OEM PURCHASE AND SALE
AGREEMENT NO. 011449 (“Agreement”) 

BETWEEN SELLER
CORPORATION AND NORTEL NETWORKS LIMITED 

This Amendment #5 to OEM Purchase and
Sale Agreement No. 011449 by and between Nortel Networks Limited, a Canada corporation
with offices located at 8200 Dixie Road, Suite 100, Brampton, Ontario, Canada L6T 5P6
(Nortel Networks) and AudioCodes Ltd., an Israeli corporation with offices located at 1
Hayarden Street, Airport City, 70100 Lod, Israel (Seller), will be effective as of January
1, 2005 (“Amendment #5 Effective Date”), 

WHEREAS, Nortel Networks and Seller
entered into an OEM Purchase and Sale Agreement dated April 28, 2003
(“Agreement”); and 

WHEREAS, Nortel Networks and Seller
wish to amend certain provisions relating to support of the Products in Exhibit C of the
Agreement and for revising the terms and conditions of the Agreement; 

NOW, THEREFORE, in consideration of
the premises and the promises set forth herein, the parties agree as follows: 

	1. 	Nortel
Networks and Seller agree to amend the following sections of Exhibit C of           the
Agreement as follows: 

	 	1.1 	Delete
the existing section 1.1 and replace by: 

	 	
Remote Technical
Services – At Nortel Networks’ request Seller will provide Nortel Networks
with remote technical support services, as described in Section 3 of Exhibit H to this
Agreement, under (a) Seller’s Standard Support Package (b) Seller’s Enhanced
Support Package (c) Seller’s Standard Support Package with 24x7 support (“24x7
Support Package”), or (d) Seller’s Premium Support Package. 

	 	1.2 	Delete
the existing section 1.1.1 and replace by:

	 	
Support Package
Charges – Seller’s basic charges for the support packages described in
Section 1.1 will be calculated at the end of each calendar quarter during the Term. As of
the last day of the calendar quarter, for each support package and each Product group
(e.g., Mediant products) (and in the case of 24X7 and Premium Support Packages in each
control protocol) supported under a package, Seller will calculate the total Price of all
Products in the Product group (and, if applicable, each control protocol under each
Product group) purchased by Nortel Networks since the Effective Date (“Product Group
Cumulative Volume”). 

	 	(a) 	Standard
and Enhanced – For the Standard Support Program and the                Enhanced
Support Program Seller will apply the Product Group Cumulative Volume                to
the matrix in Subsection 1.1.2 below to determine the percentage to be used
               in calculating the technical support charges that will apply retroactively
for                the calendar quarter just ending. Seller will divide the resulting
effective                annual dollar charge by 4 to calculate the quarterly charge to
invoice. For                example, as of the end of the third quarter of the second
year of the Term, if                Nortel Networks’ Product Group Cumulative Volume
for Mediant Product                supported under the Standard Support Package were [*]
and the Product Group                Cumulative Volume for Mediant Products supported
under the Enhanced Support                Package were [*] million, then the applicable
percentages to be used would be                [*] and [*] respectively. Applying the
percentages in the examples, the basic                charges Seller would invoice Nortel
Networks for the quarter would be [*] for                the Standard Support Package and
[*] for the Enhanced Support Package (i.e., the                effective annual charge
divided by [*]). 

	 	(b) 	24X7
and Premium Support Packages – For the 24X7 and Premium Support
               Packages only, Nortel Networks agrees that the applicable support charges
will                be determined by applying the Product Group Cumulative Volume on a
per control                protocol basis (i.e., a separate calculation for each of [*],
[*] and [*]). In                that regard if the Product Group Cumulative Volume for
one protocol for Mediant                Products were [*] million then Seller would
invoice Nortel Networks for [*] for                the 24x7 Support Package for the
calendar quarter just ending (i.e., the                effective annual charge divided by
4), based on the “greater than”               requirement in the applicable
matrix column in Subsection 1.1.2. 

	 	1.3 	Delete
the existing section 1.1.2 and replace by:

	Product Group
Cumulative Volume per
Support Package  	[*] 	[*] 	[*] 	[*] 
	Standard Support Program	[*]	[*]	[*]	[*]
	Enhanced Support Program	[*]	[*]	[*]	[*]
	 
	Product Group
Cumulative Volume (per
Control Protocol) per
Support Package 	[*]	[*]	[*]	[*]
	24x7 Support Package	[*]	[*]	[*]	[*]
	Premium Support Package	[*]	[*]	[*]	[*]

* Confidential 

	 	1.4 	Delete
the existing section 1.1.3 and replace by:

	 	
Cumulative Total
Support Program Charge – Notwithstanding Subsection 1.1.1 above, during the
Term, if the total of all Product Group Cumulative Totals for the Standard or Enhanced or
24x7 Support Package exceeds [*], and until the total of all Product Group Cumulative
Totals for the same support package equals [*], Nortel Networks will not be obligated to
pay (i) more than [*] in support charges in each future calendar quarter for Standard
Support Package; or, (ii) more than [*] in total support charges for all control
protocols in each future calendar quarter for the 24X7 Support Package. Notwithstanding
Subsection 1.1.1 above, during the Term, if the total of all Product Group Cumulative
Totals for the Premium Support Package exceeds [*] million, and until the total of all
Product Group Cumulative Totals for the same support package equals [*], Nortel Networks
will not be obligated to pay more than [*] in total support charges for all control
protocols in each future calendar quarter for the Premium Support Package. When the total
of all Product Group Cumulative Totals for each of the Support Packages equals [*], the
parties will agree on the applicable percentage to be used to calculate future support
charges for the applicable support package. 

	2. 	Nortel
Networks and Seller agree to amend the following sections of Exhibit H of           the
Agreement as follows: 

	 	2.1 	Add
new section 3.10A to read:

	 	
In
addition to Seller’s obligations under this Exhibit H for providing its Premium
Support Package, the Premium Support Package will include Seller’s providing Nortel
Networks with Major Software Version releases that include performance enhancements as
well as additional features.  

	 	2.2 	Add
new section to read:

	 	— 	Premium
Support Payment Exclusions:  

	 	–	TP610
for Centrex IP (No upgrades)  

	 	–	Lab
equipment, PI equipment, R&R inventory 

	 	–	
Account specific “free labs” equipment that is used for initial lab testing
potential Service Provider customers. “Free Labs” does not include equipment
that will be later used in a network deployment. 

	3. 	This
Amendment will serve as notice under the Agreement that Seller’s           address
is now at 1 Hayarden Street, Airport City, Lod 70100, Israel. 

	4. 	Except
for this Amendment No. 5, in all other respects the Agreement shall           remain
unchanged. 

* Confidential 

IN WITNESS WHEREOF, the parties have
caused this Amendment No. 5 to the Agreement to be signed by their duly authorized
representatives. 

	NORTEL NETWORKS LIMITED

By: /s/ Nancy Scott
——————————————

Print Name: Nancy Scott
Title: SR Mgr. Supply Mgmt.
Date: May 6, 2005		AUDIOCODES LTD.

By: /s/ Ben Rabinowitz
——————————————

Print Name: Ben Rabinowitz
Title: VP Marketing and Sales, NA
Date: April 27, 2005

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