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2 FXS Port Bridge | Grandream HT502

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The Grandstream HT502 - An easy-to-use 2 FXS port ATA

The HT502 is an analog telephone adapter (ATA) featuring 2 FXS ports that allows users to create a high-quality and managable IP telephony solution. The product’s inclusion of an integrated NAT router and dual 10/100Mbps Ethernet WAN and LAN ports enables a shared broadband connection between multiple Ethernet devices as well as the extension of VoIP services to analog phones.

  • Use with Grandstream’s UCM series of IP PBXs for Zero Configruartion provisioning
  • Failover SIP server automatically switches to secondary server if main server loses connection
  • Supports 2 SIP profiles through 2 FXS ports and single 10/100Mbps port
  • TLS and SRTP security encryption technology to protect calls and accounts
  • Supports T.38 Fax for creating Fax-over-IP
  • Supports a wide range of caller ID formats
  • Automated provisioning options include TR-069 and XML config files
  • Supports 3-way voice conferencing
  • Supports advanced telephony features, including call transfer, call forward, call-waiting, do not disturb, message waiting indication, multilanguage promtps, flexible dial plan and more www.grandstream.com


  • Telephone Interfaces Two (2) FXS port (RJ11)
  • Network Interfaces Two (2) 10/100Mbps ports (RJ45)
  • LED Indicators Power,WAN, LAN, PHONE 1 and PHONE 2
  • 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.723.1, G.729A/B/E, G.728, G.726-40/32/24/16, iLBC
  • Fax Over IP T.38 compliant Group 3 fax relay up to 14.4kbps, Fax datapump V.17, V.19, V.27ter, V.29 for T.38 fax relay
  • Short/Long Haul Ring Load REN 3: Up to 150 ft on 24 AWG lines
  • Caller ID Bellcore type 1 & 2, ETSI, BT, NTT and DTMF-based CID
  • Disconnect Methods Polarity Reversal/Wink


  • QoS Layer 2 (802.1Q VLAN/802.1p) and Layer 3 (ToS, Diffserv, MPLS)
  • DTMF Method RFC2833 and/or SIP INFO
  • Provisioning and Control UPnP, HTTP, HTTPS, TELNET, TFTP, TR069, secure and automated provisioning using AES encryption, syslog


  • Media SRTP
  • Control TLS/SIPS/HTTPS
  • Management Syslog support, telnet, remote management using web broswer


  • Universal Power Supply
    • Input: 100-240VAC, 50-60Hz
    • Output: 12V VDC, 0.5A
  • Environmental
    • Operational: 32° ~ 104°F or 0° ~ 40°C;
    • Storage: -10 ~ 130°F
    • Humidity: 10 - 90% non condensing
  • Dimensions 25mm x 115mm x 75mm (when laying flat)