Someone

exten => _XXXX,1,GotoIf($[${LEN(${DIAL_DEST[1]})} = 0]?2:4)
exten => _XXXX,2,GotoIf($[${LEN(${DIAL_DEST})} = 0]?14:3)
exten => _XXXX,3,SetVar(DIAL_DEST[1]=${DIAL_DEST})
exten => _XXXX,4,SetVar(INDEX=1)
exten => _XXXX,5,GotoIf($[${LEN(${DIAL_TIMEOUT[${INDEX}]})} = 0]?6:7)
exten => _XXXX,6,SetVar(DIAL_TIMEOUT[${INDEX}]=20)
exten => _XXXX,7,Dial(${DIAL_DEST[${INDEX}]},${DIAL_TIMEOUT[${INDEX}]},${DIAL_OPTS[${INDEX}]}g)
exten => _XXXX,8,GotoIf($["${DIALSTATUS}" = "BUSY" | "${DIALSTATUS}" = "CHANUNAVAIL" | "${DIALSTATUS}" = "CONGESTION"]?12:9)
exten => _XXXX,9,GotoIf($["${DIALSTATUS}" = "NOANSWER"]?14:10)
exten => _XXXX,10,Wait(2)
exten => _XXXX,11,Hangup
exten => _XXXX,12,SetVar(INDEX=$[${INDEX} + 1])
exten => _XXXX,13,GotoIf($[${LEN(${DIAL_DEST[${INDEX}]})} = 0]?14:5)
exten => _XXXX,14,GotoIf($[${LEN(${VOICE_MAILBOX})} = 0]?19:15)
exten => _XXXX,15,Voicemail(${VOICE_MAILBOX})
exten => _XXXX,16,Wait(2)
exten => _XXXX,17,Hangup
exten => _XXXX,18,GotoIf($["${DIALSTATUS}" = "NOANSWER"]?19:22)
exten => _XXXX,19,Voicemail(u${EXTEN})
exten => _XXXX,20,Wait(2)
exten => _XXXX,21,Hangup
exten => _XXXX,22,Voicemail(b${EXTEN})
exten => _XXXX,23,Wait(2)
exten => _XXXX,24,Hangup
exten => _XXXX,116,AbsoluteTimeout(30)
exten => _XXXX,117,Playback(sorry-mailbox-full)
exten => _XXXX,118,Wait(2)
exten => _XXXX,119,Hangup
exten => _XXXX,120,Goto(116)
exten => _XXXX,123,Goto(116)