[inbound]

; Insert a gosub before the rest of your script.
exten => ._,1,Gosub(spamcheck, CHECK, 1);

; Rest of your script goes here.
;exten => ._,n,RestOfScript


[spamcheck]

; Before answering the call, run the phonespamfilter AGI script.
exten => CHECK,1,AGI(phonespamfilter.php)

; If the call is SPAM, transfer to the SPAM extension.
exten => CHECK,n,GotoIf($["${PHONESPAMFILTER}" = "2"]?SPAM,1:)

; If the callerid is not found, transfer to the NOCID extension.
exten => CHECK,n,GosubIf($["${PHONESPAMFILTER}" = "0"]?NOCID,1:)

; Pass the call along to the rest of the script.
exten => CHECK,n,Return()

; For SPAM calls, simply answer and then hang up.
exten => SPAM,1,Answer()
exten => SPAM,n,Hangup()

; For NOCID calls, we can do extra processing or prompts if we want.
; For this simple example, let the call through.
exten => NOCID,1,Return()