Prblm with g option of DIAL

Good morning
I’m a beginner, I have a small problem with the g option of the DIAL() fonction…
This is my extension…

[quote]exten => _910.,1,System(php -q /var/www/html/crm_reception/cdr/nappel_extn.php ${EXTEN:1} ${CALLERID(num)} ${CDR(uniqueid)} )
exten => _910.,2,Macro(recepnejme,${EXTEN:1},${CALLERID(num)},${CDR(uniqueid)})
;exten => _910.,3,hangup()
exten => _910.,3,System(php -q /var/www/html/crm_reception/cdr/appel_fin.php ${EXTEN:1} ${CALLERID(num)} ${CDR(uniqueid)} )
exten => _910.,4,hangup()
And this is my Macro:

exten => s,1,Dial(IAX2/xpert/${ARG1},20,g)
exten => s,2,Goto(s-${DIALSTATUS})
exten => s-NOANSWER,1,System(php /var/www/html/crm_reception/cdr/nrp.php ${ARG3} ${ARG2} ${ARG4} ${ARG1} )
exten => s-BUSY,1,System(php /var/www/html/crm_reception/cdr/bzy.php ${ARG3} ${ARG2} ${ARG4} ${ARG1} )
exten => s-ANSWER,1,System(php /var/www/html/crm_reception/cdr/nappel_rep.php ${ARG2} ${ARG3} ${ARG4} )
exten => s-CONGESTION,1,System(php /var/www/html/crm_reception/cdr/congs.php ${ARG3} ${ARG2} ${ARG4} ${ARG1} )[/quote]

All the instruction after the Dial() fonction doesn’t work.

I used the M option too no way…

any one can help me please

My Os: Linux CentOs
Asterisk version: 1.4

Thank you