WIKI SAYS...

Release 1-2 and later 
 
DBPut(family/key=${foo})    (deprecated) 
Set(DB(family/key)=${foo})


I DO...

exten => 1,1,Set(DB(flags/${CALLERIDNUM})=${EXTEN})
exten => 1,n,noop(DB(flags/${CALLERIDNUM}))
exten => 1,n,hangup

CLI SAYS...

-- Executing Set("SIP/RemoteBrian-b0223f60", "DB(flags/4111)=1") in new stack
-- Executing NoOp("SIP/RemoteBrian-b0223f60", "DB(flags/4111)") in new stack
-- Executing Hangup("SIP/RemoteBrian-b0223f60", "") in new stack

SHOULDNT THAT NOOP JUST SAY '1'?