SEC Form 3 
FORM 3	UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940 	  
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1. Name and Address of Reporting Person*
Tipping David W.	

(Last)	(First)	(Middle)	
C/O SONUS NETWORKS, INC.	
4 TECHNOLOGY PARK DRIVE	

(Street) 
WESTFORD	MA	01886	

(City)	(State)	(Zip)	
	2. Date of Event Requiring Statement (Month/Day/Year)
04/14/2011 	3. Issuer Name and Ticker or Trading Symbol 
SONUS NETWORKS INC [ SONUS ] 		
		4. Relationship of Reporting Person(s) to Issuer 
(Check all applicable) 
	Director		10% Owner	
X	Officer (give title below)		Other (specify below)	
VP, Prod Mkting & Prod Mgmt	
	5. If Amendment, Date of Original Filed (Month/Day/Year)				
			6. Individual or Joint/Group Filing (Check Applicable Line) 
X	Form filed by One Reporting Person	
	Form filed by More than One Reporting Person	
	
Table I - Non-Derivative Securities Beneficially Owned	
1. Title of Security (Instr. 4) 	2. Amount of Securities Beneficially Owned (Instr. 4) 	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 	4. Nature of Indirect Beneficial Ownership (Instr. 5) 	
Common Stock	21,919	D		
Common Stock	570	I	By Trust(1) 	
Table II - Derivative Securities Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities) 	
1. Title of Derivative Security (Instr. 4) 	2. Date Exercisable and Expiration Date (Month/Day/Year)	3. Title and Amount of Securities Underlying Derivative Security (Instr. 4) 	4. Conversion or Exercise Price of Derivative Security 	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 	6. Nature of Indirect Beneficial Ownership (Instr. 5) 	
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares				
Employee Stock Option (right to buy)	12/21/2005	09/09/2015	Common Stock	12,500	4.91	D		
Employee Stock Option (right to buy)	01/09/2010	01/09/2016	Common Stock	10,000	4.91	D		
Employee Stock Option (right to buy)	(2) 	06/15/2020	Common Stock	100,000	2.69	D		
Explanation of Responses:	
1. 570 shares are held by a trust. The reporting person and his spouse are trustees of the trust. The reporting person disclaims any beneficial interest in these 570 shares except to the extent of his pecuniary interests therein.	
2. 25% of the shares underlying this option will vest on June 15, 2011. The remaining 75% of the shares underlying this option will then vest in equal monthly increments for the following 36 months through June 15, 2014.	
Remarks:	
	
	David W. Tipping	04/15/2011	
	** Signature of Reporting Person	Date	
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.	
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).	
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).	
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.	
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.