Acme Packet Inc (APKT) SEC Filing 10-K Annual report for the fiscal year ending Thursday, December 31, 2009

Exhibit 99.1

Investor Relations:		Industry Analysts / Trade and Business Press:
Brian Norris		Carmen Harris
Acme Packet		Connect2 Communications
+1 781.328.4790		+1 919.554.3532
bnorris@acmepacket.com		carmen@connect2comm.com

Acme Packet Reports Record Results for Fourth Quarter of 2009

– Company Posts Record Revenue of $41.3 Million and Non-GAAP¹ EPS of $0.11 –

– Company Now Expects 2010 Revenue and Earnings Growth of 30% –

BURLINGTON, MA. – February 2, 2010

— Acme Packet, Inc. (NASDAQ: APKT), the leader in session border control solutions, today announced record results for the fourth quarter ended December 31, 2009 and raised its business outlook for 2010.

Results for the Fourth Quarter of 2009

Total revenue for the fourth quarter of 2009 was $41.3 million, compared to $30.6 million in the fourth quarter of last year and $36.3 million in the third quarter of 2009. Net income for the fourth quarter of 2009 was $9.1 million, or $0.14 per share on a diluted basis, compared to $3.7 million, or $0.06 per share on a diluted basis in the fourth quarter of 2008 and $3.6 million, or $0.06 per share on a diluted basis, in the third quarter of 2009. Net income on a non-GAAP basis for the fourth quarter of 2009 was $6.8 million, or $0.11 per share on a diluted basis, compared to $5.6 million, or $0.09 per share on a diluted basis, in the same period last year, and $5.7 million, or $0.09 per share on a diluted basis, in the third quarter of 2009. A reconciliation of GAAP to non-GAAP results is included at the end of this press release.

“We are pleased to report strong fourth quarter results which were highlighted by record revenues and solid earnings growth. Accelerating demand for our solutions over the last year has led to growing momentum in all areas of the business,” said Andy Ory, President and Chief Executive Officer of Acme Packet, Inc. “Looking ahead, we now expect to deliver revenue and earnings growth of approximately 30% in 2010 with operating margin, excluding stock-based compensation and amortization of acquired intangible assets, approaching 30% by the fourth quarter.”