With Akuvox 2-wire SIP Video Intercom Solution there is no need to carry out expensive, time-consuming rewiring for the building. Installers can just reuse the existing 2-wire cables to install the intercom devices. In addition, the R20A-2 door phone has a compact size and supports on-wall, in-wall, and angled installations, which can suit most building environments With Akuvox's smart intercom solution residents can enjoy crystal clear audio communication with visitors as well as see them befor