Sec Form 4 Filing - MELAMPY PATRICK J @ ACME PACKET INC - 2012-03-19

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 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 MELAMPY PATRICK J 2. Issuer Name and Ticker or Trading Symbol ACME PACKET INC [ APKT] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) Chief Technology Officer (Last) (First) (Middle) C/O ACME PACKET, INC., 100 CROSBY DRIVE 3. Date of Earliest Transaction (MM/DD/YY) 03/19/2012 (Street) BEDFORD, MA01730 4. If Amendment, Date Original Filed (MM/DD/YY) 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 (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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 03/19/2012 S( 1 ) 17,700 D $ 27.7975 ( 2 ) 2,789,770 D Common Stock 03/19/2012 S( 1 ) 12,300 D $ 28.2204 ( 3 ) 2,777,470 D Common Stock 03/20/2012 S( 1 ) 27,700 D $ 28.0864 ( 4 ) 2,749,770 D Common Stock 03/20/2012 S( 1 ) 2,300 D $ 28.4083 ( 5 ) 2,747,470 D Common Stock 1,212,000 I By the MeLampy-Lawrence Family Trust ( 6 )

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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 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

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other MELAMPY PATRICK J C/O ACME PACKET, INC. 100 CROSBY DRIVE BEDFORD, MA01730 X Chief Technology Officer Signatures /s/ Tim Demakis, as attorney-in-fact 03/21/2012 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Sales were made pursuant to 10b5-1 plans entered into by the reporting person. ( 2 )This price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $27.13 to $28.12. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price. ( 3 )This price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $28.13 to $28.36. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price. ( 4 )This price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $27.39 to $28.38. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price. ( 5 )This price is the weighted average sale price for the transactions reported on this line. The prices for the transactions reported on this line range from $28.39 to $28.47. The reporting person undertakes to provide, upon request by the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price. ( 6 )Shares held by the MeLampy-Lawrence Family Trust for the benefit of the reporting person's minor children. The reporting person's spouse is a trustee of the MeLampy-Lawrence Family Trust, and the reporting person may be deemed to have a pecuniary interest in these shares. The reporting person disclaims beneficial ownership of these securities, and this report shall not be deemed an admission that the reporting person is the beneficial owner of such securities for the purpose of Section 16 or for any other purpose.

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 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).

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