The one-year deal will give Rosenfels the chance to become an unrestricted free agent again next spring, but his value won't be different unless he gets a chance to play some more this season.
Rosenfels got the start in last year's regular season finale at Baltimore and started off with a 76-yard touchdown pass to Chris Chambers, but he struggled from then on and finished 16-of-38 for 264 yards with three interceptions, including one returned for a touchdown.
Barring a major surprise, Rosenfels again will be the No. 3 quarterback this season behind A.J. Feeley and whoever the Dolphins bring in.
The team already has entertained Minnesota free agent Gus Frerotte and was expected to meet with former Tampa Bay starter Brad Johnson on Friday.