Sonus (SONS +13.2%) jumps on news rival Acme Packet is getting acquired by Oracle (I, II) for $1.7B - the Street is betting Oracle's move will compel another IT giant (Cisco? IBM? H-P?) to use M&A to enter or strengthen its position in the VoIP infrastructure market. Sonus has a market cap ~60% smaller than Acme's buyout price, but (as a 10-year chart shows) the company has been struggling for some time. WAN optimization hardware leader Riverbed (RVBD +2%) might also be getting a lift.