Expand Callback Function
Both gsm and 3G gateway support to expand callback function, but you need config it in SSH way.
Please follow steps below:
Step 1: define gsm channel entry:
root@Openvox-Wireless-Gateway:~# cd /etc/asterisk/
root@Openvox-Wireless-Gateway:~/memcfg/etc/asterisk# vi chan_extra.conf
#include extra-global.conf
;#include extra-channels.conf
;context=gsm-1 //default calls go to [gsm-1] context in extensions_routing.conf
context=gsm-custom-1 ////Now leading calls go to [gsm-custom-1] context in extensions_custom.conf
signalling = gsm
vol=70
mic=1
dacgain=-15
adcgain=-3
debugat=on
gsm_ec=off
anonymouscall=off
call_waiting=off
.......
step 2: Modify asterisk.conf to change dirrectory of agi
[directories]
astetcdir => /etc/asterisk
astmoddir => /usr/lib/asterisk/modules
astvarlibdir => /usr/lib/asterisk
astagidir => /etc/asterisk/agi-bin
astspooldir => /tmp/media/spool/asterisk
astrundir => /var/run
astlogdir => /tmp/log/asterisk
astdatadir => /etc/asterisk
step 3: Creat your own Dialpan:
Such as: any incoming call from gsm-1.1 will be hangup, gsm gateway will automatically callback through gsm-1.1 and connect the caller with sip ext 1001.
[gsm-custom-1]
exten => s,1,Set(DESTINATION=${CALLERID(num)})
exten => s,n,Noop(===========incoming call=============)
exten => s,n,hangup()
exten => h,1,Noop(=======call back start=========)
exten => h,n,DeadAGI(callback.php,${DESTINATION},"1001",gsm-callback.s.1,20) ;1001 is sip ext
exten => h,n,Hangup()
[gsm-callback]
exten => s,1,Noop(====${CALLERID(num)}====)
exten => s,n,Dial(EXTRA/1/${CALLERID(num)}) ;using port gsm-1.1 to callback
exten => s,n,Hangup()
Please upload files below to your gsm gateway. Put them in this directory: /etc/asterisk/agi-bin