13G Filing: Capital Research Global Investors and Sonus Networks Inc (SONS)

SECURITIES AND EXCHANGE COMMISSION
Washington, DC 20549

Schedule 13G
Under the Securities Exchange Act of 1934

Amendment No. 3

Item 1(a) Name of Issuer:
Sonus Networks, Inc.

Item 1(b) Address of Issuer’s Principal Executive Offices:
4 Technology Park Drive
Westford, MA 01886

Item 2(a) Name of Person(s) Filing:
Capital Research Global Investors

Item 2(b) Address of Principal Business Office or, if none,
Residence:
333 South Hope Street
Los Angeles, CA 90071

Item 2(c) Citizenship: N/A

Item 2(d) Title of Class of Securities:
Common Stock

Item 2(e) CUSIP Number:
835916503

Item 3 If this statement is filed pursuant to sections 240.13d-1(b)
or 240.13d-2(b) or (c), check whether the person filing is a:
(e) [X] An investment adviser in accordance with
section 240.13d-1(b)(1)(ii)(E).

Item 4 Ownership

Provide the following information regarding the aggregate
number and percentage of the class of securities of the issuer
identified in Item 1.

(a) Amount beneficially owned:
(b) Percent of class:
(c) Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
(ii) Shared power to vote or to direct the vote:
(iii) Sole power to dispose or to direct the disposition of:
(iv) Shared power to dispose or to direct the disposition of:

See page 2

Capital Research Global Investors is deemed to be the
beneficial owner of 1,395,540 shares or 2.8% of the 49,522,648
shares believed to be outstanding as a result of CRMC acting as
investment adviser to various investment companies registered
under Section 8 of the Investment Company Act of 1940.

CUSIP: 835916503 Page 3 of 4