The actual callsigns are SAM 28000 and SAM 29000.
The aircraft "reg" are 28000/29000, and when the Pres/VP are not on board, then their callsigns are SAM 28000/29000. There are lots of other Air Force aircraft that they use, including 757's and Gulfstreams, all of which become Air Force One/Two when they are on board.
There is a famous moment related to this when Former President Richard Nixon resigned as President and VP Gerald Ford became President. Nixon was in the air flying home to California when Ford was sworn in, and at that moment somewhere over Missouri, the pilot radioed to ATC "Air Force One is now SAM 27000" (the prior 707-based AF1).
Greg
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