Hello & Welcome to Just Answer,
I'm Greg and will do my best to assist you today.
If you are referring to using THIS phone system to block unwanted callers, the answer would be "no" - this system does NOT have that feature.
But may I ask what service provider (phone company) you have for this phone line?
Also, can you tell me (guess) approximately HOW MANY callers you will want to be blocking - in the near future?
Please REPLY using the box below and the SEND button.
I see it has been a few days and I haven't seen a response on this page, so I just wanted to follow up to see if you have any more questions concerning this issue OR if the issue was resolved?
I only ask because this particular phone system does NOT have any call blocking features. BUT, your service provider (phone company) MAY offer the ability to block a number of call, for either a fixed fee OR as part of you "service package".
Another option is a SEPARATE device that can be attached to ANY phone line (landline service) - that will do the job for you. As a reference, I have a link below to a search is did (on Amazon) for such a device.
Call Blocker for Landline search resultshttp://amzn.to/2bKpxLQ
I look forward to any further questions or results that you may have.
Thanks, ***** *****--. .-(im)