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freepbx asterisk add prefix to callerid

[from-trunk-add-eight-prefix] exten => _XXXXXXX.,1,Set(CALLERID(num)=8${CALLERID(num)}) exten => _XXXXXXX.,n,Goto(from-trunk,${EXTEN},1)

exten => _X.,n,Goto(from-trunk,${EXTEN},1)