Valcom VC-VIP-204 SIP Paging Gateway 200 Series Page Controls Type: Accessories Ports: 4 Analog Audio Output Local Background Music Input Specifications: 4 Zones of One-Way Analog Paging Plus 8 Zones of IP Paging: 4 Analog Audio Output Local Background Music Input 4 Programmable Form A Relay Closures Features: Designed for Use with Virtually All SIP Based Telephone Systems Live or Recorded Messages 65,000 Speakers, Expandable to 256 IP Paging Zones Easily Connect Loudspeaker System to Existing Computer Networks Supports IP & Analog Amplified Speakers Supports Legacy Paging Systems Night Ring for SIP Systems Feedback Eliminator Store and Play.