Asterisk call treatment using a database

extensions.conf

[context-incoming]

    exten => s, 1, NoOp()
        ;**** Check if a call treatment exists for the caller ****
        same => n, Set(action=${TOLOWER(${ODBC_CALL_TREATMENT(${ARG1},${CALLERID(name)},${CALLERID(num)})})})

        ;**** Jump to label normal if none is found ****
        same => n, GotoIf(${ISNULL(${action})}?normal)

        ;**** Jump to the propriate call treatment action, or treatment-invalid if not found ****
        same => n, GotoIf(${DIALPLAN_EXISTS(context-incoming,treatment-${action})}?treatment-${action},1:treatment-invalid,1)

        ;**** Normal call processing ****
        same => n(normal), NoOp()
  
    ;--------------------------------------------
    ; call treatment : busy
    ;--------------------------------------------
    exten => treatment-busy, 1, Verbose(0, Call treatment (busy) : ${CALLERID(num)})
        same => n, Answer()
        same => n, PlayTones(busy)
        same => n, Wait(3600)
        same => n, Hangup()
        same => n, Return()

    ;---------------------------------------------
    ; Call treatment : Quiet
    ;---------------------------------------------
    exten => treatment-quiet, 1, Verbose(0,Call treatment (quiet) : ${CALLERID(num)})
        same => n, Answer()
        same => n, PlayTones(ring)
        same => n, Wait(3600)
        same => n, Hangup()
        same => n, Return()

    ;---------------------------------------------
    ; Call treatment : Torture menu (english)
    ;---------------------------------------------
    exten => treatment-torture-en, 1, Verbose(0,Call treatment (torture-en) : ${CALLERID(num)})
        same => n, Answer(500)
        same => n, Wait(1)
        same => n, Set(CHANNEL(language)=en)
        same => n(torture-en-loop), NoOp()
            same => n, Playback(custom/torture-menu-part1)
            same => n, PlayTones(ring)
            same => n, Wait(2)
            same => n, Playback(custom/torture-menu-part2)
            same => n, Goto(torture-en-loop)

    ;---------------------------------------------
    ; Invalid call treatment
    ;---------------------------------------------
    exten => treatment-invalid, 1, Log(WARNING, Invalid call treatment for ${CALLERID(num)} : ${action})
        same => n, goto(s,normal)

func_odbc.conf

[CALL_TREATMENT]
dsn=asterisk
readsql=SELECT action FROM call_treatment WHERE (extension='${SQL_ESC(${ARG1})}' or extension='') AND ('${SQL_ESC(${ARG2})}' RLIK    E caller_name OR caller_name='') AND ('${SQL_ESC(${ARG3})}' RLIKE caller_num AND NOT caller_num='') ORDER BY extension DESC, caller_num DESC LIMIT 1