Blacklist or whitelist

Add this to extensions.conf just below the [radio-secure] context.

; To add a node to the blacklist: 
; database put blacklist 1998 “any comment”
; to remove:
; database del blacklist 1998
 
[blacklist]
exten => _XXXX!,1,NoOp(${CALLERID(num)})
exten => _XXXX!,n,GotoIf($[${DB_EXISTS(blacklist/${CALLERID(num)})}]?blocked)
exten => _XXXX!,n,Goto(radio-secure,${EXTEN},1)
exten => _XXXX!,n(blocked),Hangup;

In iax.conf modify the [radio] context by commenting context = radio-secure and adding context = blacklist

[radio]
type = user
disallow = all
allow = ulaw
allow = adpcm
allow = gsm
codecpriority = host
;context = radio-secure
context = blacklist
transfer = no