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* MELAMPY PATRICK J (Last) (First) (Middle) C/O ACME PACKET, INC. 71 THIRD AVENUE (Street) BURLINGTON MA 01803 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 10/12/2006	3. Issuer Name and Ticker or Trading Symbol ACME PACKET INC [ APKT ]
		4. 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	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, $0.001 par value	4,500,000	D
Common Stock, $0.001 par value	2,000,000	I	By The MeLampy-Lawrence Family 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
Series A Convertible Preferred Stock	09/21/2000	(2)	Common Stock	161,290	(2)	D
Stock Option (right to buy)	(3)	05/19/2014	Common Stock	100,000	$0.33	D
Stock Option (right to buy)	(4)	12/23/2015	Common Stock	300,000	$1.1	D

Explanation of Responses:

1. 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 purposes of Section 16 or for any other purpose.

2. The Series A Convertible Preferred Stock is convertible into Acme Packet, Inc. common stock on a one-for-one basis and has no expiration date.

3. Twenty-five percent of the shares underlying the option vest on May 25, 2005, and the balance of the shares vest in equal monthly installments at the end of each calendar month beginning on June 30, 2005, and ending on May 31, 2008.

4. Twenty-five percent of the shares underlying the option vest on December 31, 2006, and the balance of the shares vest in equal monthly installments at the end of each calendar month beginning on January 31, 2007, and ending on December 31, 2009.

	/s/ Patrick MeLampy	10/12/2006
	** 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).
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