[incoming]
exten => tonnum,1,Set(LANGUAGE()=fr)
exten => tonnum,2,NoOp(${CALLERID})
exten => 0tonnum,3,Answer()
exten => tonnum,4,Wait(1)
exten => tonnum,5,Hangup()
exten => h,1,system(cp /home/walhala/callback /var/spool/asterisk/outgoing)


fichier callback 

Channel: SIP/numaappeler@tonpeerdesorti
Context: call
Extension: lenumquetuveutcall
Priority: 1