The SIP Emergency Intercom delivers two-way communication and secure access control for your VoIP phone system. These devices are perfect for a multitude of indoor settings, such as commercial or residential facilities, schools and universities, retail establishments, warehouses, and manufacturing plants. Features - Full duplex audio with enhanced acoustic echo canceling - Half duplex push-to-talk audio from the phone side using the phone's keypad or from the intercom side using the call button - Simultaneous SIP and multicast - Supports user-uploadable ring and alert tones - Loud/Night Ringer function - second SIP extension - Can receive pages directly from Poly phones as well as other devices that send standard multicast - DTMF-controlled dry relay contact for auxiliary control - Door closure and tamper alert signal - Network volume control - Supports Auxiliary Strobe Kit for visual notification - Intended for indoor use only - TLS 1.2 and SRTP enhanced security for IP endpoints in a local or cloud-based environment - Autoprovisioning via HTTP, HTTPS, or TFTP - HTTPS or HTTP web-based configuration. HTTPS is enabled by default - Configurable event generation for device health and status monitoring - 802.11q VLAN tagging - Web-based upgradeable firmware - Support for Cisco SRST resiliency