Whether you need a great multi line telephone for the home or office, Multi line office phones have the features to suit your needs without having to purchase a whole telephone system. These Multi Line Office Telephones work wonderfully in residential applications, or when a system is not yet necessary. Best of all, these Multi line Telephones may be used as the "extra device" or extension when integrated with another Panasonic and AT&T series system. This is possible through their advanced technology.