vicidial.org

I did not very understand what's the different for method of call handling of agi-VDAD_ALL_inbound.agi.
What's difference for CID * ANI type of method?
What's the purpose of Closer?
What's the purpose of xDIGITID?
What's different between CID & CIDLOOKUP?
What's different between ANI & ANILOOKUP?

Have you read the help notes, the Manager Manual, the code?

ANI is only used for RBS T1s, if you don't know what that is then you don't have one.

CID creates a new entry for every call, CIDLOOKUP will try to lookup the CallerID in the vicidial_list table to find a match first.