- SIP Talkback Door Intercom allows communication to SIP-based telephone systems or Valcom Enhanced Station Port adapters via an IP-based network- Mounts In Standard Double Gang Electric Box- High Loudspeaker Levels for Use in Moderate to High Noise Areas- Indoor Only- Smart Relay (VM-SRLY for VIP-176A)- RJ-45 for network connection- 1 Form C Smart Relay (optional)- Network activity LEDs- Power over Ethernet (PoE) 802.3af compatible