NOW SUPPORTS SIP! The new Singlewire Loudspeaker Amplifier (AC-Powered) is for use with Singlewire's paging and emergency notification software InformaCast® or InformaCast CK. This PoE-powered device now includes some brand new features such as dual registration for both Singlewire and SIP, and hooks up easily to new and existing Singlewire installations, providing an easy method for implementing a loud IP-based overhead paging system for loud areas, warehouses, manufacturing areas, and outdoor areas.