Video surveillance operations are migrating to hybrid IP-based audiovisual systems, because combining intercom and public address capabilities on the same infrastructure as surveillance cameras enables video surveillance, access control, voice communications, and alarm monitoring on a single system. Barix AG of Zurich, Switzerland, offers a variety of devices that can integrate with video cameras and recording technology on the IP layer. The Annuncicom PS16 is a multifunction master station for use in IP intercom, paging, and voice over IP (VoIP) applications. It offers redundant Ethernet interfaces and power over Ethernet support. Other Annuncicom devices offer direct connections to microphones and pushbuttons at intercom stations, as well as SIP functionality for interfacing with telephone and public address systems.