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Clearance items can be either customer returns in "like-new" condition (Open Box Items), unused inventory stock rotation, or manufacturer refurbished. All items are tested, quality assured, fully functional, and carry a full 90 day manufacturer's warranty.
caller ID, call waiting, 3-way conference, blind or attended transfer
call forward, do not disturb, voicemail, MLS voice prompts
T.38 fax, flexible dial plan, direct IP calling
Supports Voice Codecs:
G.711(a/u-law), G.723.1, G.729A/B, G.729E
G.726-40/32/24/16 and iLBC
T.38 Fax
HTTP/HTTPS(pending)/Telnet/TFTP Provisioning
SIP over TCP/TLS
IP connectivity for any phone and fax
Web management for easy configuration and installation
Offers traditional and advanced telephony features
Portable and compact for use at home or on the road. AC power supply included
Grandstream HT502 - Overview
The HT502 is SIP 2.0 standard compliant 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. It supports Universal Plug-in-Play (UPnP), up to 2 SIP account profiles, and traditional and advanced telephony features.
The HT502 provides an enhanced level of security and provides automated provisioning using symmetric and asymmetric voice codec/RTP in any call sessions, and supports a broad range of popular voice codecs.
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
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
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
DHCP Server / Client
Yes, can operate in NAT Router or Switched Mode
QoS
Diffserve, TOS, 802.1 P/Q VLAN tagging
IP Transport
RTP/RTCP
IP Signalling
SIP (RFC 3261)
DTMF Method
Flexible DTMF transmission method, user interface of In-audio, RFC2833, and/or SIP Info
Provisioning
TFTP, HTTP, HTTPS (pending)
Management
Syslog support, HTTPS and telnet (pending), remote management using Web browser, Auto/manual provisioning system Support Layer 2 (802.1Q, VLAN, 802.1p), Layer 3 QoS (Tos, DiffSery, MPLS)
Power
Output: 12VDC, 0.5A; Input: 100–240 VAC, 50-60 Hz
Environmental
Operational: 32°–104°F or 0°–40°C Storage: 10°–130°F Humidity: 10–90% Non-condensing
Dimensions ( H x W x D)
25mm x 115mm x 75mm (when laying flat); 115mm x 25mm x 75mm (standing up)
Short and long haul
REN3: Up to150 ft on 24 AWG line
Caller ID
Bellcore Type 1 & 2, ETSI, BT, NTT, and DTMF-based CID
