X0203 3 2011-04-14 0 0001105472 SONUS NETWORKS INC SONUS 0001517225 Tipping David W. C/O SONUS NETWORKS, INC. 4 TECHNOLOGY PARK DRIVE WESTFORD MA 01886 0 1 0 0 VP, Prod Mkting & Prod Mgmt Common Stock 21919 D Common Stock 570 I By Trust Employee Stock Option (right to buy) 4.91 2005-12-21 2015-09-09 Common Stock 12500 D Employee Stock Option (right to buy) 4.91 2010-01-09 2016-01-09 Common Stock 10000 D Employee Stock Option (right to buy) 2.69 2020-06-15 Common Stock 100000 D 570 shares are held by a trust. The reporting person and his spouse are trustees of the trust. The reporting person disclaims any beneficial interest in these 570 shares except to the extent of his pecuniary interests therein. 25% of the shares underlying this option will vest on June 15, 2011. The remaining 75% of the shares underlying this option will then vest in equal monthly increments for the following 36 months through June 15, 2014. David W. Tipping 2011-04-15