Oesterle was called up from AHL Providence on Wednesday, Conor Ryan of The Boston Globe reports.
Oesterle was placed on waivers by the Bruins on Friday, Elliotte Friedman of Sportsnet reports.
Oesterle signed a two-year, two-way contract with the Bruins on Monday.
Oesterle was reassigned to AHL Calgary on Friday, according to Randy Sportak of The Hockey News.
Oesterle was placed on waivers by the Flames on Thursday, Pat Steinberg of Sportsnet 960 The Fan reports.
Oesterle has been a healthy scratch for 10 straight games.
Oesterle has played in seven of the Flames' nine games in January.
Oesterle was called up by the Flames on Wednesday.
The Flames placed Oesterle on waivers Thursday, Elliotte Friedman of Sportsnet reports.
Oesterle agreed to a one-year, $925,000 contract with Calgary on Sunday.