--- product_id: 50104356 title: "Grandstream Networks HandyTone 503 - VoIP telephone adapters (HTTP/HTTPS/Telnet/TFTP, 115 x 15 x 25 mm, 0-40 °C, UL)" brand: "grandstream" price: "0 zł" currency: PLN in_stock: false reviews_count: 8 url: https://www.desertcart.pl/products/50104356-grandstream-networks-handytone-503-voip-telephone-adapters-http-https-telnet store_origin: PL region: Poland --- # Dual 10/100 Mbps FXS/FXO Gateway 1-Year Warranty Grandstream Networks HandyTone 503 - VoIP telephone adapters (HTTP/HTTPS/Telnet/TFTP, 115 x 15 x 25 mm, 0-40 °C, UL) **Brand:** grandstream **Price:** 0 zł **Availability:** ❌ Out of Stock ## Summary > 📈 Elevate Your Communication Game! ## Quick Answers - **What is this?** Grandstream Networks HandyTone 503 - VoIP telephone adapters (HTTP/HTTPS/Telnet/TFTP, 115 x 15 x 25 mm, 0-40 °C, UL) by grandstream - **How much does it cost?** 0 zł with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.pl](https://www.desertcart.pl/products/50104356-grandstream-networks-handytone-503-voip-telephone-adapters-http-https-telnet) ## Best For - grandstream enthusiasts ## Why This Product - Trusted grandstream brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Peace of Mind:** Enjoy a full year of warranty against hardware defects. - • **Lightning-Fast Speeds:** Experience dual 10/100 Mbps ports for optimal performance. - • **Seamless Connectivity:** Easily connect to your VoIP network with FXS/FXO support. - • **Plug & Play Simplicity:** NAT/PAT transparency ensures hassle-free deployment. - • **Versatile Compatibility:** Connect your analog devices effortlessly with RJ11 ports. ## Overview The Grandstream Networks HandyTone 503 is a cutting-edge VoIP telephone adapter designed for seamless integration into your network. With dual 10/100 Mbps ports, it supports both FXS and FXO connections, ensuring compatibility with a variety of analog devices. Its plug-and-play functionality and one-year warranty make it a reliable choice for modern communication needs. ## Description - 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, ## Features - FXS / FXO analog gateway adapter to connect to a VoIP Network - Dual 10/100 Mpbs ports (RJ45) with integrated router - 1 FXS telephone port (RJ11), 1 FXO PSTN line port (RJ11) - NAT/PAT transparency for plug & play deployment - 1 year warranty against hardware defects ## Technical Specifications | Specification | Value | |---------------|-------| | Item Weight | 0.75 Pounds | | Control Method | Remote | | Compatible Devices | Personal Computer | | LAN Port Bandwidth | 10/100 megabits_per_second | | Is Electric | Yes | | Number of Ports | 2 | ## Product Details - **Brand:** Grandstream - **Model Name:** GS-HT503 - **Frequency Band Class:** Single-Band - **Compatible Devices:** Personal Computer - **Recommended Uses For Product:** Home, Small Office - **Connectivity Technology:** Ethernet - **Item Weight:** 0.75 Pounds - **Operating System:** Linux - **Number of Ports:** 2 - **Control Method:** Remote ## Images ![Grandstream Networks HandyTone 503 - VoIP telephone adapters (HTTP/HTTPS/Telnet/TFTP, 115 x 15 x 25 mm, 0-40 °C, UL) - Image 1](https://m.media-amazon.com/images/I/81vxv62ykML.jpg) ## Questions & Answers **Q: Is it ce approved for the uk and does it have a uk mains plug?** A: Mine has a CE sticker on the back and the PSU has a 3 pin plug. **Q: Does the Grandstream Handytone 503 work properly with Caller ID from an incoming Virgin Media UK analogue phone line?** A: Theoretically, yes, but I have never tried it. ## Customer Reviews ### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars Great PTSN to Voip *by M***Y on Reviewed in the United Kingdom on 29 August 2014* GreatI have had the Obi110 for about 16 mouths, not bad at all, the voice codex was a little unclear, the setup was easy with online help, and echo cancellation was OK. Then lighting came and bang obi110 no more.Anyway I moved on to the Cisco spa3102 don’t even thing about using the device its bad bad bad,Looked around on the internet seen the Grandstream HandyTone 503 and looked deeper into it, found some great review, I dived right in. Not the easiest to setup but out of the box voice codex was clear, a little quite to start with but upped the gain all fixed, Caller ID works ever time,Echo cancellation on the Grandstreams handyTone 503 is great, no problems, I’m really impressed with Grandstreams handyTone 503.My setup is..Grandstream HandyTone 503 PTSN to voip,Freepbx,Cisco 7940 sip, ### ⭐⭐⭐⭐ 4.0 out of 5 stars Capable but requires patience to get configuration spot on *by C***S on Reviewed in the United Kingdom on 11 October 2016* A very capable little box, but with that comes overwhelming configuration pages for the domestic user.That said, if your VoIP provider has configuration settings for their service available in their help or forum pages you should easily find the basic settings to get the thing working. The manufacturer also has an active community offering help and support and also responds quickly to help tickets.I had to reconfigure the box to download an earlier version of firmware to get a fairly basic feature working - if this sounds scary, it's not the box for you. ### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars As described. Good piece of kit. *by D***K on Reviewed in the United Kingdom on 23 May 2017* As described. Good piece of kit. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.pl/products/50104356-grandstream-networks-handytone-503-voip-telephone-adapters-http-https-telnet](https://www.desertcart.pl/products/50104356-grandstream-networks-handytone-503-voip-telephone-adapters-http-https-telnet) --- *Product available on Desertcart Poland* *Store origin: PL* *Last updated: 2026-05-18*