You can ask your service provider to give you a list of the DID ranges you currently have. You can also ask them for the coresponding DNIS information sent with each of those.
They should be able to give you a list and based on the DNIS and incoming digit manipulation (if any) you will be able to identify if those are actual DID extensions or not.
- Miguel
A very wise and well respected man once told me "Shut Up!".
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