Company:  ACME PACKET INC
Form Type:  SC 13G/A
Filing Date:  4/10/2012 
CIK:  0001130258 
Address:  100 CROSBY DRIVE 
City, State, Zip:  BEDFORD, Massachusetts 01730 
Telephone:  781-328-4400 
Fiscal Year:  12/31 
Description of Business
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  FORM SC 13G/A