chan_LCR in Freepbx

hello everyone.
i am running debian with freepbx 2.11 and asterisk 1.8
i do need to make calls using the ISDN.
in an identical machine without freepbx i managed to install the chan_LCR following the instructions from ( i have managed make/receive calls through ISDN. if i want to make calls i dial 0 and then the line opens
exten => _0.,1,Dial(LCR/callstoISDNlcr/${EXTEN:1},n)
exten => _0.,2,Verbose(2,$(DIALSTATUS))
exten => _0.,3,Hangup

does anyone know how to implement it in FREEPBX please?