Cisco Systems’ (s CSCO) $2.9 billion purchase of wireless networking equipment maker Starent might be in trouble: The Law Offices of Brian M. Felgoise, P.C. , a law firm in Pennsylvania thinks that the wireless equipment makes is taking the lowball offer and not striking a hard enough bargain. Cisco’s $3 billion purchase of Tandberg is also facing opposition from shareholders who own 24 percent of the company. I wonder if Cisco might have to raise its offering price on these deals.