Grandstream HT503 ATA/VoIP Adapter - Used
Please note that this item is a second-hand product. While we ensure that every item is in 100% working condition and has been thoroughly tested for functionality, it may show signs of previous use, including scuffs, scratches, or minor cosmetic wear. These imperfections do not affect the performance of the item.
If you are uncertain or require additional images, please request them before purchase.
Warranty & Refund Policy – 7-Day Return & Swop or Refund Policy only. No Warranty is applicable on this item.
You are entitled to return equipment within 7 days of purchase or receipt of the goods, provided that:
• The equipment is not fit for purpose as described at the time of sale.
• The return request is made within 7 calendar days from the date of purchase or delivery.
• A handling fee of up to 15% of the purchase price may be deducted for returns not due to defects or misrepresentation.
The Grandstream HT503 is a reliable ATA (Analog Telephone Adapter) designed for converting traditional telephones and fax machines to VoIP. With 1 FXS port for analog phones, 1 FXO PSTN line port with lifeline support, and dual 10/100 Mbps Ethernet ports, it provides seamless integration between legacy and IP telephony networks.
Its compact design, easy configuration via web interface or encrypted configuration files, and support for multiple voice codecs ensure stable, high-quality VoIP communications for small office and home deployments.
Key Features & Benefits
✔ 1 × FXS telephone port (RJ11) and 1 × FXO PSTN port with lifeline
✔ Dual 10M/100 Mbps Ethernet ports with integrated NAT router
✔ Protocol support: TCP/UDP/IP, RTP, HTTP/HTTPS, ARP/RARP, ICMP, DNS, DHCP, NTP, TFTP, PPPoE, STUN, TELNET
✔ LED indicators for Power, WAN, LAN, PHONE, and LINE
✔ Advanced DSP audio features: G.723, G.729, G.711, G.726, iLBC; VAD, CNG, AGC, PLC, Echo Cancellation
✔ Call handling: Caller ID, call waiting, call transfer, hold, forward, DND, 3-way conferencing
✔ Fax over IP T.38 compliant and G.711 pass-through
✔ Manual or DHCP network setup with NAT traversal via STUN
✔ Auto/manual provisioning with TFTP/HTTP/HTTPS; syslog support
✔ Stylish, compact design; universal power supply for travel
Ideal Uses
✔ Converting analog phones/fax machines to VoIP
✔ Small office or home office VoIP deployments
✔ Secure, high-quality voice communication
✔ Legacy PSTN integration into modern VoIP networks
Specifications
✔ Condition: Used item with visible signs of previous use, including scuffs, scratches, or minor cosmetic wear. Device has been tested and is fully functional. These cosmetic imperfections do not affect performance.
✔ Manufacturer & Model: Grandstream HT503
✔ Product Type: ATA / VoIP Adapter
✔ LAN Ports: 1 × RJ45 10/100 Mbps
✔ WAN Ports: 1 × RJ45 10/100 Mbps
✔ FXS Port: 1 × RJ11
✔ FXO Port: 1 × PSTN pass-through / lifeline
✔ LEDs: Power, WAN, LAN, PHONE, LINE
✔ Power: 100–240V AC input, 12V DC 0.5A output
✔ Dimensions: 25 × 115 × 75 mm
✔ Weight: ~0.3 kg (0.6 lbs)
✔ Operating Temperature: 5–45°C (32–104°F)
✔ Storage Temperature: 10–55°C
✔ Humidity: 10–90% non-condensing
Warranty
✔ 7-Day Return & Swop or Refund Policy only (No Warranty)
What’s in the Box
✔ Grandstream HT503 ATA/VoIP Adapter
✔ Power Adapter