| Main centres: | 1-3 business days |
| Regional areas: | 3-4 business days |
| Remote areas: | 3-5 business days |
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: 100240V AC input, 12V DC 0.5A output
Dimensions: 25 × 115 × 75 mm
Weight: ~0.3 kg (0.6 lbs)
Operating Temperature: 545°C (32104°F)
Storage Temperature: 1055°C
Humidity: 1090% 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
