Someone

exten => 4362,1,SetGlobalVar(STA=foo)
exten => 4362,2,NoOp(STA:${STA})
exten => 4362/_4XXX,3,GoToIf($["${STA}" = "ANSWER"]?500,4)
exten => 4362,4,NoOp(STA:${STA})
exten => 4362,5,SetGlobalVar(STA = ANSWER)
exten => 4362,6,Dial(SIP/${EXTEN},25,twWg)
exten => 4362,7,NoOp(Dial Status:${DIALSTATUS})
exten => 4362,8,SetGlobalVar(STA = foo)

exten => 4362/_4XXX,102,Goto(from-sip,4362-${DIALSTATUS},1)
exten => 4362,103,Hangup
exten => 4362-BUSY,1,Playback(beep)
exten => 4362-BUSY,2,Playback(beep)
exten => 4362-BUSY,3,Goto(from-sip,4362,6)
exten => 4362-CHANUNAVAIL,1,Hangup

exten => 4362,500,Playback(beep)
exten => 4362,501,Playback(beep)
exten => 4362,503,Wait(4)
exten => 4362,504,Goto(from-sip,4362,1)