Grandstream HT812-V2 2-Port FXS ATA with Gigabit NAT Router SIP T.38 TLS-SRTP

Grandstream HT812-V2 Powerful 2-port ATA with Gigabit NAT Router 

The HT812 V2 is an advanced 2-port analog telephone adapter (ATA) with 2 FXS ports and an integrated Gigabit NAT router. Built upon Grandstream’s market-leading SIP ATA/gateway technology with millions of units successfully deployed worldwide, this powerful ATA features exceptional voice quality in various application environments, strong encryption with unique security certificate per unit, automated provisioning for volume deployment and device management, and outstanding network performance for home and office use. 

Key Features

• Supports 2 SIP profiles through 2 FXS ports and dual Gigabit ports
• Includes a built-in NAT router which can handle routing speeds up to 100MBps
• TLS and SRTP security encryption technology to protect calls and accounts
• LED Indicators - POWER, NET1, NET2, PHONE1, PHONE2
• Automated provisioning options include TR-069 and XML config files
• Supports 3-way voice conferencing
• Failover SIP server automatically switches to secondary server if main server loses connection
• Supports T.38 Fax for creating Fax-over-IP
• Supports a wide range of caller ID formats
• Use with Grandstream’s UCM series of IP PBXs for Zero Configuration provisioning

Technical Specification

• Interfaces:
  • Telephone Interfaces: Two (2) RJ11 FXS ports; can be expanded by peering with an FXS gateway
  • Network Interfaces: Two (2) 10/100/1000Mbps RJ45 ports
  • LED Indicators: POWER, NET1, NET2, PHONE1, PHONE2
  • Factory Reset Button: Yes
• Voice, Fax, Modem:
  • Telephony Features: Caller ID display or block, call waiting, flash, blind or attended transfer, forward, hold, do not disturb, 3-way conference
  • Voice Codecs G.711 with Annex I (PLC) and Annex II (VAD/CNG), G.722, G.723.1, G.729A/B, G.726-32, iLBC, OPUS, dynamic jitter buffer, advanced line echo cancellation
  • Fax Over IP: T.38 compliant Group 3 Fax Relay up to 14.4kpbs and auto-switch to G.711 for Fax Pass-through
  • 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
  • Dial Methods: DTMF, Pulse
  • Disconnect Methods: Busy Tone, Polarity Reversal/Wink, Loop Current
• Signaling:
  • Network Protocols: TCP/IP/UDP, RTP/RTCP (RFC1889, 1890), HTTP/HTTPS, ARP/RARP, ICMP, DNS, DHCP, NTP, TFTP, SSH, Telnet, STUN (RFC3489,, 5389), SIP (RFC3261), SIP over TCP/TLS, SRTP, SNMP, TR-069, IMS/3GPP, IPoE
  • QoS: Layer 2 (802.1Q VLAN, SIP/RTP 802.1p) and Layer 3 (ToS, Diffserv, MPLS), Traffic shaping
  • DTMF Method: In-audio, RFC2833 and/or SIP INFO
  • Provisioning and Control: HTTP, HTTPS, SSH, TFTP, TR-069 , secure and automated provisioning using AES encryption, syslog
• Security:
  • Media: SRTP
  • Control:
    • TLS/SIPS/HTTPS, SDP(RFC 2327), Refer (RFC 3515), Offer/Answer (RFC3265)
    • SIP V2.0 (RFC 3261, 3262, 3264), RFC3261
    • ETC (3GPP TS 24.629, RFC 3515, RFC 3891, RFC 3892)
    • SIP Session Timer (RFC 4028)
  • Management: Syslog support, SSH, remote management using web browser
• Physical:
  • Universal Power Supply:
    • Input: 100-240VAC, 50-60Hz
    • Output: 12V/0.5A
  • Environmental:
    • Operational: 32º – 123ºF or 0º – 50ºC
    • Storage: 14º – 140ºF or -10º – 60ºC
    • Humidity: 10 – 90% Non-condensing
  • Dimension: 28.5 x 130 x 90 mm (H x W x D)
  • Weight: 353.33g
• Compliance:
  • FCC/CE/RCM, K.21