Grandstream HT-502 2FXS Analog VoIP Adapter



The Grandstream HT-502 is the newest in the HandyTone Analog Telephone Adaptor Series. The HandyTone 502 offers more powerful feature functionality and significantly better data router performance than its predecessor, as well as a new stylish look and design.

The Grandstream HT-502 is based on SIP standard and features 2 FXS ports, dual 10M/100Mbps Ethernet ports with integrated high performance NAT router, port status and message waiting LED, and a base stand for vertical positioning. The Grandstream Handytone 502 supports UPnP, SIP over TCP/TLS, up to 2 SIP account profiles, caller ID, call waiting, 3-way conference, blind or attended transfer, call forward, do not disturb, voicemail, T.38 fax, flexible dial plan, direct IP calling, multi-language voice prompts, secure and automated provisioning using HTTP/HTTPS/Telnet/TFTP, symmetric and asymmetric voice codec/RTP in any call sessions, and various popular voice codecs including G.711(a/u-law), G.723.1, G.729A/B, G.729E, G.728, G.726-40/32/24/16 and iLBC.


  • Supports UPnP, SIP over TCP/TLS
  • Up to 2 SIP Account Profiles
  • Caller ID
  • Call Waiting
  • 3-Way Conference
  • Blind or Attended Transfer
  • Call Forward
  • Do Not Disturb
  • Voicemail
  • T.38 Fax
  • Flexible Dial Plan
  • Direct IP Calling
  • Multi-Language Voice Prompts
  • Secure and Automated Provisioning using HTTP/HTTPS/Telnet/TFTP
  • All-in-1 VoIP IAD
  • Built-in Router, NAT and Gateway
  • 2 FXS Port
  • 10/100Mbps Ethernet
  • Compact, Lightweight and Highly Affordable

Telephone Interfaces

  • 2 FXS ports
  • 2 SIP accounts

Network Interface

  • Two (2) 10M/100 Mbps
  • RJ-45

LED Indicators

  • Power
  • WAN
  • LAN
  • PHONE1
  • PHONE2

Reset Button

  • Factory Reset button

Voice over Packet Capabilities

  • Voice Activity Detection (VAD) with CNG (comfort noise generation)
  • PLC (packetloss concealment)
  • Dynamic Jitter Buffer
  • Modem detection & auto-switch to G.711,
  • Packetized Voice Protocol Unit (supports RTP/RTCP and AAL2 protocol)
  • G.168 compliant Echo Cancellation
  • LEC (line echo cancellation) with NLP
  • Asymmetric RTP stream

Voice Compression

  • G.711 + Annex I (PLC)
  • Annex II (VAD/CNG format) encoder and decoder
  • G.723.1A
  • G.726(ADPCM)
  • G.729A/B/E
  • iLBC
  • G.726 provides proprietary VAD, CNG, and signal power estimation
  • Voice Play Out unit (reordering, fixed and adaptive jitter buffer, clock synchronization)
  • AGC (automatic gain control)
  • Status output
  • Decoder controlling via voice packet header

DHCP Server/Client

  • Yes, NAT Router or Switched Mode

Telnet Server

  • Yes

Fax over IP

  • T.38 compliant Group 3 Fax Relay up to 14.4kpbs and auto-switch to G.711 for Fax
  • Pass-through
  • Fax Datapump V.17
  • V.19
  • V.27ter
  • V.29 for T.38 fax relay


  • Diffserve
  • TOS
  • 802.1 P/Q VLAN tagging

IP Transport RTP/RTCP

  • DTMF Method Flexible DTMF transmission method
  • User interface of In-audio
  • RFC2833 SIP Info

IP Signaling

  • SIP (RFC 3261)


  • TFTP
  • HTTP


  • SIP over TCP/TLS


  • Syslog support
  • HTTPS and telnet
  • Remote management using Web browser
  • Support Layer 2 (802.1Q, VLAN, 802.1p) and Layer 3 QoS (Tos, DiffSery, MPLS)
  • Auto/manual provisioning system

Dial Plan

  • Yes

  • Yes


Power Adapter

  • Input: 100-240V AC, 50/60Hz, 0.5A Max
  • Output: 12V DC, 1.25A


  • Operational32o–104oF or 0o–40oC
  • Storage: 10o–130o F / Humidity: 10–90% Non-condensing

Dimensions (H x W x D)

  • 115mm (L) x 75mm (W) x 27mm (H)

Short and long haul

  • REN3: Up to150 ft on 24 AWG line

Call Handling Features

  • Caller ID display or block
  • Call waiting caller ID
  • Call waiting/flash
  • Call transfer
  • Hold
  • Forward
  • Mute
  • 3-way conferencing
  • Message waiting
  • Do-Not-Disturb (DND)
  • Call-return service
  • Caller ID Bellcore Type 1 & 2
  • ETSI
  • BT
  • NTT
  • DTMF-based CID

Polarity Reversal / Wink

  • Yes


  • EN55022/EN55024
  • FCC part15 Class B


  • UL

Ships With:

  • HandyTone Analog Telephone Adapter
  • Universal Power Adapter
  • Ethernet Cable
  • Quick Installation Guide

Where to buy

Created by: nhynes, Last modification: Tue 03 of Jun, 2014 (17:16 UTC) by sergei
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