[default]

exten => XXX,1,Macro(callextension,${EXTEN})

[macro-callextension]
exten => s,1,Dial(${ARG1},30,t)
exten => s,2,Voicemail(${ARG2})
exten => s,3,Hangup
exten => s,102,Voicemail(${ARG2})
exten => s,103,Hangup