This solution (paraphrased) is presented in the Cisco Press book - Configuring Callmanager and Unity (A Step by Step Guide)
You can use a Unity Call Handler (with the same Extension as the Meet-Me DN)
Set up the Call Handler to do a Supervised Transfer to Ring the Meet-Me Conference.
Under the "Gather Caller Information" section of the Call Handler check "Confirm" and "Ask Callers Name"
When callers go through the Unity Call Handler they are asked to record their name, when the caller is forwarded to the Meet-Me Conference the name is played and conference participants are asked to Press 1 to accept the call or Press 2 to reject the call.
There is a nice discussion of this setup in this recent post (Thanks Deji and Robert);
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