> on our landline the phone lights up and shows the caller ID a second or so before it rings Not sure about the US, but in Australia this is a phone specific f

> on our landline the phone lights up and shows the caller ID a second or so before it rings Not sure about the US, but in Australia this is a phone specific feature. The Caller ID comes between the first and second ring, so if you want a call blocking feature that is completely silent, you need to silence the first ring of every call. Some phones will do this automatically, others (like my Panasonic landline) make it an option you can turn on & off. The Panasonic FAQ has some info: http://eng.faq.panasonic.com/app/answers/detail/a_id/26547/~/i-want-to-block-calls-on-my-phone.-can-my-phone-do-this%3F-kx-tge-series%2C http://eng.faq.panasonic.com/app/answers/detail/a_id/26547/~...