The Dolphins signed wide receiver Az-Zahir Hakim and guard Chris Liwienski on Thursday as unrestricted free agents. The 29-year-old Hakim was a fourth-round draft choice of the Rams in 1998 and has played with St. Louis, Detroit, New Orleans, and most recently San Diego. He has 316 career receptions for 4,191 yards and 28 touchdowns. He returned 165 punts for a 10.7-yard average, including three for touchdowns.