[asterisk-users] How to detect fake CallerID? (8xx?)

Doug Lytle support at drdos.info
Wed May 10 10:24:19 CDT 2017

>>> I ask my SIP provider to include more headers to show the real ANI? What would that service be 
>>> called?

If it's anything like a PRI provider, I've been told they only way to get true CID, in those instances, would be to provide a 1-800 number (US) for them to call. Then you'd get correct CID, since you're paying for both legs of the call.

I do not know if this holds true for a SIP provider,


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