User's Manual
FIRMWARE VERSION 1.0.7.6 HT502 USER MANUAL Page 12 of 48
PR ODUCTOVERVIEW
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.
SOFTWAREFEATURESOVERVIEW
• 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
TABLE 3: HT502 TECHNICAL SPECIFICATIONS
Telephone Interfaces
2 FXS ports, 2 SIP accounts
Network Interface
1 RJ45 for LAN, 10/100 Base-TX, Full Duplex
1 RJ45 for WAN,10/100Base-TX, Full Duplex
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