FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person * Sirota Gennady H   2. Issuer Name and Ticker or Trading Symbol Starent Networks, Corp. [STAR] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) V.P. Product Management (Last) (First) (Middle) 30 INTERNATIONAL PLACE 3. Date of Earliest Transaction (Month/Day/Year) 12/18/2009 (Street) TEWKSBURY, MA 01876 4. If Amendment, Date 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 (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock (1) 12/18/2009   A   17,142 A $ 0 26,814 D   Common Stock 12/18/2009   D   26,814 D (2) 0 D

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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

ISO

$ 0.3

12/18/2009

D

7,500

(3)

01/23/2013

Common Stock

7,500

(3)

0

D

ISO

$ 1.65

12/18/2009

D

20,000

(4)

07/26/2015

Common Stock

20,000

(4)

0

D

ISO

$ 1.65

12/18/2009

D

12,500

(5)

09/29/2016

Common Stock

12,500

(5)

0

D

ISO

$ 8.25

12/18/2009

D

9,001

(6)

04/13/2017

Common Stock

9,001

(6)

0

D

NQSO

$ 12.97

12/18/2009

D

70,000

(7)

03/19/2018

Common Stock

70,000

(7)

0

D

NQSO

$ 16.11

12/18/2009

D

31,420

(8)

04/17/2019

Common Stock

31,420

(8)

0

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Sirota Gennady H 30 INTERNATIONAL PLACE TEWKSBURY, MA 01876			V.P. Product Management

Signatures

/s/ Paul J. Milbury, Attorney-in-Fact		12/22/2009
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(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).
(1)	Grant of restricted stock unit award, each restricted stock unit representing the right to receive one share of issuer's common stock. These restricted stock units vest over four years, with 25% of the underlying shares vesting on each anniversary of the grant date.
(2)	Disposed of pursuant to the merger agreement between issuer and Cisco Systems, Inc. ("Cisco") in exchange for two restricted stock unit awards for an aggregate of 39,304 shares of Cisco's common stock, which had a closing sales price as quoted on the NASDAQ Global Select Market of $23.33 per share on effective date of the merger. The restricted stock unit award for 25,127 shares of Cisco's common stock vests over four years, 25% on December 18, 2010 and an additional 25% each year thereafter, subject to the reporting person's continued service to the issuer or Cisco. The restricted stock unit award for 14,177 shares of Cisco's common stock vests over four years, 25% on April 17, 2010 and an additional 25% each year thereafter, subject to the reporting person's continued service to the issuer or Cisco.
(3)	This fully vested option was assumed by Cisco in the merger and replaced with an option to purchase 10,993 shares of Cisco common stock for $0.21 per share.
(4)	This fully vested option was assumed by Cisco in the merger and replaced with an option to purchase 29,316 shares of Cisco common stock for $1.13 per share.
(5)	This option, which provided for vesting as to 25% of the underlying shares on September 29, 2007 and as to an additional 6.25% each quarter thereafter, was assumed by Cisco in the merger and replaced with an option to purchase 18,323 shares of Cisco common stock for $1.13 per share.
(6)	This option, which provided for vesting as to 20% of the underlying shares on January 1, 2008 and as to an additional 5% of the underlying shares each quarter thereafter, was assumed by Cisco in the merger and replaced with an option to purchase 13,194 shares of Cisco common stock for $5.63 per share.
(7)	This option, which provided for vesting as to 25% of the underlying shares on March 19, 2009 and as to an additional 6.25% each quarter thereafter, was assumed by Cisco in the merger and replaced with an option to purchase 102,609 shares of Cisco common stock for $8.85 per share.
(8)	This option, which provided for vesting as to 25% of the underlying shares on April 17, 2010 and as to an additional 6.25% each quarter thereafter, was assumed by Cisco in the merger and replaced with an option to purchase 46,056 shares of Cisco common stock for $10.99 per share.

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