Acme Packet Inc (APKT) SEC Filing 10-K Annual report for the fiscal year ending Saturday, December 31, 2011

Exhibit 99.1

Acme Packet Reports Results for Fourth Quarter of 2011

– Fourth Quarter Revenues of $83.0 million, up 18% Year-Over-Year –

– Revenues of $307.3 million in 2011, up 33% over 2010 –

Bedford, Massachusetts – February 2, 2012 – Acme Packet, Inc. (NASDAQ: APKT), the leader in session delivery network solutions, today announced results for the fourth quarter and full year ended December 31, 2011. All earnings per share results are on a fully diluted basis.

Results for the Fourth Quarter of 2011

Total revenue for the fourth quarter of 2011 was $83.0 million, an increase of 18% compared to $70.2 million in the fourth quarter of 2010 and an increase of 18% compared to $70.6 million in the third quarter of 2011. Net income for the fourth quarter of 2011 was $8.7 million, or $0.12 per share, compared to $14.5 million, or $0.21 per share, in the fourth quarter of 2010 and $7.9 million, or $0.11 per share, in the third quarter of 2011. Net income on a non-GAAP¹ basis for the fourth quarter of 2011 was $18.3 million, or $0.26 per share, compared to $18.1 million, or $0.26 per share, in the fourth quarter of 2010, and $14.6 million, or $0.21 per share, in the third quarter of 2011.

Results for 2011

Total revenue in 2011 was $307.3 million, an increase of 33% compared to $231.2 million in 2010. Net income in 2011 was $44.4 million, or $0.63 per share, compared to $43.0 million, or $0.63 per share, in 2010. Net income on a non-GAAP¹ basis in 2011 was $72.3 million, or $1.02 per share, compared to $55.0 million, or $0.81 per share, in the same period last year.