Grandstream HandyTone ATA-503
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
• 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
o caller ID from both IP and PSTN,
o call waiting, 3-way conference with IP and/or PSTN,
o remote call origination and termination from/to PSTN,
o hop-on and hop-off calling,
o transfer to OR forward to IP or PSTN,
o do not disturb,
o message waiting indication,
o multi-language voice prompts,
o 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
Benefits
• 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
Specifications
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
• 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
o caller ID from both IP and PSTN,
o call waiting, 3-way conference with IP and/or PSTN,
o remote call origination and termination from/to PSTN,
o hop-on and hop-off calling,
o transfer to OR forward to IP or PSTN,
o do not disturb,
o message waiting indication,
o multi-language voice prompts,
o 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
Benefits
• 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
Specifications
Handytone ATA-503 | Details |
| Ethernet Ports | 2x RJ45 (LAN/WAN) |
| Nat Router | Yes |
| DHCP | Client/Server |
| FXS Port | 1 |
| FXO Port | Programmable |
| 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 |
Technical Specifications
Technical Specifications | |
Telephone Interfaces | 1 FXS telephone port (RJ11), 1 FXO PSTN line port (RJ11) with lifeline support |
Network Interface | 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. |
| 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 |
DHCP Server/Client | Yes, can operate in NAT Router or Switched Mode |
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 |
| 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 Signaling | 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 |
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 & 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 |
Connection example

HandyTone ATA Comparison Guide
Features | HT-286 | HT-502 | HT-503 |
| Ethernet Ports | 1 RJ45 (LAN) | 2 RJ45 (LAN/WAN) | 2 RJ45 (LAN/WAN) |
| NAT/Router | No | Yes | Yes |
| DHCP | Client | Client/Server | Client/Server |
| FXS Port | 1 | 2 | 1 |
| FXO Port | No | No | Programmable |
| PSTN Pass-through Port | No | No | Yes |
| Voice Mail Indicator | Yes | ||
| Video Codec | G.711(a/µ-law), iLBC, G.723, G.729A/B, G.726, T.38(fax) (G.729 A/B/E – HT502) | ||
| Remote Configuration | TFTP/HTTP | ||
Download here the Grandstream ATA503 Datasheet
Download here the Handytone Quick Install Guide
Download here the Grandstream ATA503 User Manual
| EAN Code | 6947273700074 |
| Color | Black |
| Number of FXO ports | 1 Port |
| NAT/Router | Yes |
| PSTN Pass-through Port | Yes |
| Number of FXS ports | 1 Port |
| Number of lines | 1 |
| Extra network port | Yes |
| Price | € 55.02 |

