Ask user to state there name

[Charles_Darwin]

Accept or reject call with IVR and transfer call upon acception

In the Advanced Settings for an extension, you’ll find an option Call Screening, which is very similar to what you are trying to implement. From the tool tip: Call Screening requires external callers to say their name, which will be played back to the user and allow the user to accept or reject the call. ... I suggest you experiment with it. You won’t be able to use it directly, but making a copy of its code and modifying it to meet your needs may be an easy way to achieve your application. …