You can use the Call Blocking page to accept all calls or block calls only from specific people.
To accept all calls, or to block calls only from specific people:
Click Call Blocking in the left navigation bar. The Call Blocking page appears.
Select Accept calls from anyone not listed above as the Call Blocking Default.
To accept calls from everyone, click Save Changes. All calls are now accepted.
To block calls from specific individuals or groups, and accept calls from everyone else, click the Add Name button below the Block Calls From list. The Select User or Group dialog box appears.
Choose users or groups whose calls you want to block and click Finish. The names of the blocked callers appear in the Block Calls From list.
Click Save Changes.