Brand - Grandstream, Model - Grandstream HT812, Type - Analog Telephone Adapter, Number of phone Line - 2 Line, Caller ID - Yes, Power Source - Adapter (Universal Power Supply Input 100-240VAC 50 - 60Hz; Output 12V/0.5A), Input Power - 100-240VAC, 50-60Hz, Output Power - 12V/0.5A, Features - Caller ID display or block, call waiting, flash, blind or attended transfer, forward, hold, do not disturb, 3-way conference, Supports T.38 Fax for reliable Faxover-IP, Supports dual Gigabit network ports, Others - Telephone Interfaces: Two (2) RJ11 FXS ports, Network Interfaces: Two (2) 10/100/1000Mbps RJ45 ports, LED Indicators: POWER, LAN, WAN, PHONE1, PHONE2, Factory Reset Button: Yes, Short/Long Haul Ring Load: 3 REN, up to 1km on 24AWG line, Caller ID: Bellcore Type 1 & 2, ETSI, BT, NTT, and DTMF-based CID, Disconnect Methods: Busy Tone, Polarity Reversal/Wink, Loop Current, Network Protocols: TCP/IP/UDP, RTP/RTCP, HTTP/HTTPS, ARP/RARP, ICMP, DNS, DHCP, NTP, TFTP, SSH, STUN, SIP (RFC3261), SIP over TCP/TLS, SRTP, TR-069, DTMF Method: In-audio, RFC2833 and/or SIP INFO, Media: SRTP, Control: TLS/SIPS/HTTPS, Management: Syslog support, SSH, remote management using web browser, Dimension: 28.5 x 130 x 90 mm, Weight: 353.33gm, Specialty - Supports 2 SIP profiles and 2 FXS ports, Strong AES encryption with security certificate per unit, Automated & secure provisioning options using TR069, 3-way voice conferencing per port, Exceptional voice quality with wideband HD codec, High performance NAT router, 2 SIP profiles through 2 FXS ports and dual Gigabit ports, Warranty - 1 year, Country of Origin - USA, Made in/ Assemble - China