Grandstream Networks HT502 - Manual (Page 7)

Grandstream Networks, Inc. HT-502 User Manual Page 7 of 31
Firmware Version 1.0.1.21 Last Updated: 12/2008
P RODUCT O VERVIEW
The HT502 is a full feature voice and fax-over IP device that offers a high-level of integration including dual
10M/100Mbps network ports with integrated router, NAT, DHCP server, dual port FXS telephone gateway,
market-leading sound quality, rich functionalities, and a compact and lightweight design. The VoIP network
signaling protocol supported is SIP. The HT502 fully compatible with SIP industry standard and can
interoperate with many other SIP compliant devices and software on the market. Moreover, it supports
comprehensive voice codecs including G.711 (a/µ-law), G.723.1, G.726 (16/24/32/40 bit rates), AAL2 (all
G.726), G.729A/B/E and iLBC.
Software Features Overview
• 2 FXS ports
• Two RJ-45 ports (switched or routed)
• 2 SIP accounts & profiles
• Supports
Voice Codecs:
G711(a/µ, Annex I & II), G723.1A, G726 (ADPCM with 16/24/32/40 bit rates), G729 A/B/E, iLBC
• T.38 Fax
• Comprehensive Dial Plan support for Outgoing calls.
• G.168
Echo Cancellation
• Voice Activation Detection (VAD), Comfort Noise Generation (CNG), and Packet Loss
Concealment (PLC)
• Supports PSTN/PBX analog telephone sets or analog trunks
T ABLE 3: HT502 T ECHNICAL S PECIFICATIONS
Telephone Interfaces 2 FXS ports, 2 SIP accounts
Network Interface Two (2) 10M/100 Mbps, RJ-45
LED Indicators Power, WAN, LAN, PHONE1 and PHONE2
Reset Button Factory Reset button.
Voice over Packet
Capabilities Voice Activity Detection (VAD) with CNG (comfort noise generation) and PLC (packet
loss 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
QoS Diffserve, TOS, 802.1 P/Q VLAN tagging
IP Transport RTP/RTCP
DTMF Method Flexible DTMF transmission method, user interface of In-audio, RFC2833, and/or SIP
Info