Callcentric doesn't do that. If you have turned on Callcentric's telemarketer block feature via a call treatment, and you defined some condition that triggers that prompt, then the callers who call YOUR CC number will hear a prompt to press a key. You, the person answering the call won't be prompted.
If, on the other hand, you are forwarding Google Voice calls to your Callcentric number, and you have turned on Google Voice call screening, then you, the person answering the call, will hear a prompt to press 1 to accept the call, or press 2 to send the caller to GV voicemail.
