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Grandstream Networks, Inc. HT-502 User Manual Page 8 of 32
Firmware 1.0.0.77 Last Updated: 1/2008
TABLE3: HT502 TECHNICAL SPECIFICATIONS
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 (pending), 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
IP Signaling
SIP (RFC 3261)
Provisioning
TFTP, HTTP, HTTPS (pending)
Control
TLS/SIPS , SIP over TCP/TLS
Management
Syslog support, HTTPS and telnet (pending), 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
UPnP
Yes
Power
Output: 12VDC / Input: 100–240 VAC/50-60 Hz
Environmental
Operational: 32
o
–104
o
F or 0
o
–40
o
C
Storage: 10
o
–130
o
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, and DTMF-based CID
Polarity Reversal / Wink
Yes
EMC
EN55022/EN55024 and FCC part15 Class B
Safety
UL