IVR and Extensions

Hi, I have a problem: when a user calls from outside, my IVR answare, but the user can’t dial my internal extensions. Why?!?!?
When the user types the number 993 the asterisk consol writes this debug entry:
<<Oooh, got something to jump out with (‘9’)!>>

When I type the CLI command “show dialplan 993@MainMenu” the console displaies this result:
exten => _[1239]XX,1,Macro(ChiamaInterno,${EXTEN},${EXTEN})
exten => _[1239]XX,2,Hangup

Why when the user types 993 the IVR answare with this extension
exten => s-CHANUNAVAIL,2,Playback(interno-inesistente)
from Macro ChiamaInterno??!?!?

This is my IVR declare into the extensions.conf file

[macro-ChiamaInterno]
exten => s,1,Dial(SIP/${ARG1},${RINGTIME},tT)
exten => s,2,Goto(s-${DIALSTATUS},1)
exten => s,3,Hangup
exten => s-NOANSWER,1,Answer
exten => s-NOANSWER,2,Wait(1)
exten => s-NOANSWER,3,Voicemail(${ARG2})
exten => s-NOANSWER,4,Hangup
exten => s-BUSY,1,Goto(s-NOANSWER,1);
exten => s-BUSY,2,Hangup
exten => s-CHANUNAVAIL,1,Wait(1)
exten => s-CHANUNAVAIL,2,Playback(interno-inesistente)
exten => s-CHANUNAVAIL,3,Hangup
exten => s-CONGESTION,1,Goto(s-NOANSWER,1);
exten => s-CONGESTION,2,Hangup

[default]
include => InboundCalls

[InboundCalls]
include => Interni

exten => _10003,1,Goto(MainMenu,${MENUIDPRINCIPALE},1)
exten => _10003,2,Hangup

[Interni]
exten => _[1239]XX,1,Macro(ChiamaInterno,${EXTEN},${EXTEN})
exten => _[1239]XX,2,Hangup

[MainMenu]
include => Interni

exten => _${MENUIDPRINCIPALE},1,Set(__TRANSFER_CONTEXT=Interni)
exten => _${MENUIDPRINCIPALE},2,Answer
exten => _${MENUIDPRINCIPALE},3,Set(TIMEOUT(digit)=10)
exten => _${MENUIDPRINCIPALE},4,Set(TIMEOUT(response)=${MENUTIMEOUT})
exten => _${MENUIDPRINCIPALE},5,Wait(1)
exten => _${MENUIDPRINCIPALE},6,Background(menu)
exten => _${MENUIDPRINCIPALE},7,GotoIfTime(08:30-12:30,mon-sat,,?MainMenu,${MENUIDPRINCIPALE},10)
exten => _${MENUIDPRINCIPALE},8,GotoIfTime(15:30-19:30,mon-sat,,?MainMenu,${MENUIDPRINCIPALE},10)
exten => _${MENUIDPRINCIPALE},9,Goto(Interni,${CENTRALINONONUFFICIO},1)
exten => _${MENUIDPRINCIPALE},10,Goto(Interni,${CENTRALINOUFFICIO},1)

exten => i,1,Goto(MainMenu,${MENUIDPRINCIPALE},3)
exten => i,2,Hangup

exten => t,1,Goto(MainMenu,${MENUIDPRINCIPALE},7)
exten => t,2,Hangup

exten => _1,1,Wait(1)
exten => _1,2,Playback(menu-uno)
exten => _1,3,Playback(menu-grazie)
exten => _1,4,Hangup

Thank you