I have an extension under inbound DID. It routes to extension as such:
[ext-did-0002]
include => ext-did-0002-custom
exten => fax,1,Goto(ext-fax,in_fax,1)
exten => 2155551212,1,Set(__FROM_DID=${EXTEN})
exten => 2155551212,n,Gosub(app-blacklist-check,s,1)
exten => 2155551212,n,ExecIf($[...