Snom PA1, SIP 48V PoE Paging Amplifier, 2 LAN, 4 Watt Power Amplifier

This audio announcement system from Snom augments your existing SIP PBX with another component of modern communication. 

Public announcement system for office floors, reception areas and waiting rooms
Announcements in airports, trains and bus stations, and waiting lounges 
Monitoring of security-sensitive environments like entrances or reception areas
SIP 
Multicast
Remote maintenance