Authorization by ANI
This method is variation of Auth. by PIN method. There's one setting which changes the behavior of the system to act in different way. When you check Use ANI? field in Dial Plan creation window - then when user will dial in his CallerID will be checked. Only if CallerID is not found – he will be asked to enter his PIN.
CallerIDs are entered for every device in device settings using 
icon.
ANI - Automatic Number Identification
ANI is action which is used to authenticate who is calling by CallerID.
When call comes into MOR, CallerID is checked with all available CLI's in DB. If match is found - call is authorized and assigned to the device which CLI is matched against CallerID of the call:
All other details are the same as for Auth. by PIN dial plan. We are creating this dial plan same way, just check Use ANI?:
And in main Dial Plan window we have:
Note the difference between Auth. by PIN and Auth. by ANI dial plans.
Assigning DID is similar as to Auth. by PIN method.
ATTENTION! Be careful because it is very easy to fake CallerID.
Troubleshooting
If system asks to enter PIN
That means that CallerID comes in different format compared to that which is entered into Device CID. Use Last Calls to check it and Number Manipulation to fix it.
