Fed up with sales calls interrupting you at home? The BT6500 brings you unique functionality to block nuisance or unwanted calls. Its call management feature puts you back in control, by enabling you to choose the calls you want to take & those you want to block. With the BT 6500 you can choose the type of calls you want to block. For example international & withheld numbers can be blocked, which account for a large proportion of unwanted sales calls. Calls still go through to the answer machine, so if it's someone you want to hear from they can still leave a message. Alternatively if you there are specific numbers you want to block, you can block up to 10 numbers from getting through.