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Grandstream HandyTone 503 - HT503



The HandyTone 503 is the next generation of powerful, affordable, high quality and manageable IP telephony ATA/IAD for residential users and road-warriors. Its compact size, excellent voice quality, packed feature functionality and best-in-class price-performance point enable consumers to maximize the power of IP voice and data connectivity.  The HandyTone 503 is based on SIP standard and interoperable with most 3rd party SIP compliant devices and software. It features 1 FXS telephone port, 1 FXO PSTN line port, dual 10M/100Mbps network ports, port status and message waiting LED, and a base stand for vertical positioning.

Features & Benefits :


- 1 FXS telephone port (RJ11), 1 FXO PSTN line port (RJ11) with power-outage life line support,
- Up to 2 SIP account profiles, SIP over TCP/TLS, SRTP 
- Dual 10/100 Mbps network ports (RJ45) with integrated high performance NAT router 
- Status LED for power, telephone, PSTN line, network, and message waiting indication 
- Advanced telephony features:
- caller ID from both IP and PSTN, 
- call waiting, 3-way conference with IP and/or PSTN, 
- remote call origination and termination from/to PSTN, 
- hop-on and hop-off calling, 
- transfer to OR forward to IP or PSTN, 
- do not disturb, 
- message waiting indication, 
- multi-language voice prompts, 
- flexible dial plan, direct IP calling 
- Comprehensive voice codecs 
- Secure and automated provisioning using HTTP/HTTPS/Telnet/TFTP 
- Symmetric and asymmetric voice codec/RTP in any call sessions 
- T.38 Fax 
- SIP over TCP/TLS


- IP connectivity for any phone and fax
- Hop-on/Hop-off calling 
- Web management for easy configuration and installation 
- Offers traditional and advanced telephony features 
- Portable and compact for use at home or on the road


Feature Specifications

Ethernet Ports 2 RJ45 (LAN/WAN) NAT / Router Yes DHCP Client/Server FXS Port 1 FXO Port 1 PSTN Pass-through Port Yes Voice Mail Indicator Yes Voice Codec G.711(a/u-law), G.723.1, G.729A/B/E, G.726-40/32/24/16 and iLBC, T.38 fax Remote Configuration HTTP / HTTPS / Telnet / TFTP Provisioning
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Technical Specifications

Telephone Interfaces 1 FXS telephone port ( RJ11), 1 fxo PSTN line port (RJ11) with lifeline support Network Interfaces Two (2) 10M/100 Mbps ports (RJ-45) with integrated NAT router LED Indicators Power, WAN, LAN, PHONE and LINE Reset Button Factory reset button Telephony Features caller ID display or block, call waiting wither caller ID, flash, blind or attended call transfer, hold, call forward, do not disturb, 3-way conferencing Voice Codec G.711 Annex I (PLC) and Annex II (VAD/CNG format), G.723.1A, G.729A/B/E, G.726-40/32/24/16, iLBC Voice over Packet Capabilities Voice Activity Detection (VAD) with Comfort Noise Generation (CNG) and Packet Loss Concealment (PLC), Dynamic Jitter Buffer, G.168 compliant Line Echo Cancellation Fax over IP T.38 compliant Group 3 Fax Relay up to 14.4kpbs, Fax Datapump V.17, V.19, V.27ter, V.29 for T.38 fax relay DHCP Server / Client NAT router Yes, can operate in NAT Router or Switched Mode Network Protocols TCP/UDP/IP, RTP/RTCP, HTTP/HTTPS, ARP/RARP, ICMP, DNS, DHCP, NTP, TFTP, TELNET, PPPoE, STUN QoS Support Layer 2 (802.1Q VLAN, 802.1p), Layer 3 QoS (ToS, DiffServ) QoS IP Signalling SIP (RFC 3261), SIP over TCP/TLS, SRTP, up to 2 SIP account profiles, symmetric and asymmetric RTP/codec in any call sessions DTMF Method RFC2833, and/or SIP INFO Provisioning & Management TFTP, HTTP, HTTPS, Telnet, secure and automated provisioning system for large deployment, syslog Universal Power Supply 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 Polarity Reversal / Wink Yes EMC FCC/CE, EN55022/EN55024 and FCC part15 Class B Safety UL

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