Don't know if this is specifically what you are looking for, but it works 100% for me. Once you have your address book set up, only the robo calls never get through. Initially some friends wondered about pushing 5 or 6 or whatever to get through, but it does not take long to add everyone to your phone book.
Set up a call treatment for : Telemarketer Block
With our Telemarketer Block feature you can dramatically reduce and potentially eliminate unwanted telemarketing and robocalls.
When activated, inbound callers (to the DIDs that you have this feature activated on) will hear an automated message which will require them to press a specific key (1-9) in order to complete their call. Your Callcentric Phone WILL NOT begin to ring, until AFTER the inbound caller has successfully pressed the requisite key on their phone.
**Callcentric Tip: By configuring your friends, family, and colleagues' phone numbers into your Callcentric Phone Book and setting up a prioritized "Call Treatment" to route calls from these numbers directly to your phone, you can ensure that ONLY callers from unknown numbers will be prompted to press the requisite key (1-9) in order to complete their call.
