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Description
Grandstream HT812 HandyTone 812 ATA 2 FXS Port w/ Integrated Gigabit NAT RouterThe HT821 is an advanced 2 port analog telephone adapter (ATA) with 2 FXS ports with an integrated Gigabit NAT router. Built upon the Grandstream market leading SIP ATA gateway technology with millions of units successfully deployed worldwide, this powerful ATA features exceptional voice quality in various application environments, strong encryption with unique security certificate per unit, automated provisioning for volume deployment and device
The HT821 is an advanced 2-port analog telephone adapter (ATA) with 2 FXS ports with an integrated Gigabit NAT router. Built upon the Grandstream market-leading SIP ATA/gateway technology with millions of units successfully deployed worldwide, this powerful ATA features exceptional voice quality in various application environments, strong encryption with unique security certificate per unit, automated provisioning for volume deployment and device management, and outstanding network performance for home and office use.
Product Features:
- Supports 2 SIP profiles and 2 FXS ports
- Strong AES encryption with security certification per unit
- Automated & secure provisioning options using TR069
- 3-way voice conferencing per port
- Exceptional voice quality with wide-band HD codec
- Supports T.38 Fax for reliable Fax-over-IP
- Supports dual Gigabit network ports
- High performance NAT router
Product Specifications:
- Telephone Interfaces: Two (2) FXS ports
- Network Interfaces: Two (2) 10/100/1000Mbps RJ45 ports
- LED Indicators: Power, LAN, WAN, Phone1, Phone2
- Factory Reset Button: Yes
- Telephony Features: Caller ID display or block, call waiting, flash, blind or attended transfer, forward, hold, do not disturb, 3-way conference
- Voice Codecs: G.711 with Annex I (PLC) and Annex II (VAD/CNG), G.723.1, G.729A/B, G.72, iLBC, OPUS, dynamic jitter buffer, advances line echo cancellation
- Fax Over IP: T.38 compliant Group 3 Fax Relay up to 14.4kbps and auto-switch to G.711 for Fax Pass-through
- Strong/Long Haul Ring Load: 3 REN, up to 1km on 24AWG line
- Caller ID: Bellcore Type 1 & 2, ETSI, BT, NTT, and DTMF-based CID
- Disconnect Methods: Busy Tone, Polarity Reversal/Wink, Loop Current
- Network Protocols: TCP/IP/UDP, RTP/RTCP, HTTP/HTTPS, ARP/RARP, ICMP, DNS, DHCP, NTP, TFTP, TELNET, STUN, SIP, (RFC3261), SIP over TCP/TLS, SRTP, TR-069
- QoS: Layer 2 (802.1Q VLAN, SIP/RTP 802.1p) and Layer 3 (ToS, Diffserv, MPLS)
- DTMF Method: In-audio, RFC2833 and/or SIP INFO
- Provisioning and Control: HTTP, HTTPS, TELNET, TFTP, TR-069, secure and automated provisioning using AES encryption, syslog
- Media: SRTP
- Control: TLS/SIPS/HTTPS
- Management: Syslog support, telnet, remote management using web browser
- Universal Power Supply: Input 100-240VAC, 50-60Hz ; Output: 12V/0.5A
- Operational Temperature: 0 to 40°C (32 to 104°F)
- Storage Temperature: -10 to 60°C (14 to 140°F)
- Humidity: 10 - 90% (non-condensing)
- Dimensions: 28.5 x 130 x 90 mm (1.12 x 5.12 x 3.54 ")
- Weight: 353.33 g (0.78lbs)
- Compliance: FCC/CE/RDM
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.6 ★★★★★
Based on 29 reviews
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Product Reviews
★★★★★ 5
Nice
Size: 3X-Large Big, Color: White
Good shirt for price
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Reviewed in the United States on April 24, 2026
★★★★★ 3
Good, but could be better!
Size: Medium, Color: Lavender White Windowpane, Size: Medium, Color: Lavender White Windowpane
+ 3 ⭐⭐⭐ I honestly didn’t expect much at this price it's a good value for money & only if you pay the very discounted price ~$7 or ~$9, The fabric is of good quality feels soft and comfortable right out of the package, with just enough stretch to move around easily during the day. It’s light, breathable, and doesn’t feel stiff like some cheaper dress shirts tend to do.
The wrinkle resistant feature actually works only on paper, wrinkle resistant is only a slab of steel or rubber, though after a good steam iron it keeps the shape for a while. After a quick wash and dry, it came out looking presentable without needing much ironing, which is a huge win for busy mornings. The regular fit M is true to size and gives a clean, relaxed look without feeling boxy or too tight. I wore it to work and later out for dinner, and it still looked sharp by the end of the day. Love the Lavender White Windowpane color it is subtle & stylish. It adds a little personality while still being professional. The stitching and buttons feel solid, and after washing, the shirt held its shape and color well.
- 2 ⭐⭐ Here is the big critic, I liked the shirt, but it came stained there is a big stain on a sleeve, & I am not sure if it will come off, this is the second on I ordered because the first one was also stained, it seems like some oil or rust ingrained into the fabric, I can understand the first shirt was "used like new", but the second one supposed to be new, yet it is stained, a lot of loose threads, weird seams and stains. As I said this shirt justifies itself only at the discounted price.
I did my best to show it in pictures, alas not the way I wanted, it is more visible in person.
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Reviewed in the United States on December 28, 2025
★★★★★ 1
disappointing... buyer beware
Size: XX-Large, Color: Lavender White Windowpane
careful there is no pocket? what kind of essential long sleeve shirt arrives without a pocket? I took to the cleaners to have pressed, and just got it back today. so I missed the return window. I am disappointed, and a bit frustrated, it's never been worn and will not be without a pocket....
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Reviewed in the United States on June 4, 2026
★★★★★ 5
Great value
Size: XX-Large, Color: Navy White Diamond Geo
Nice shirt for the price. Needed a budget shirt to wear with a suit and this fit the bill. Fits well. Is a little thin, you can see through it if not wearing an undershirt.
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Reviewed in the United States on December 27, 2025
★★★★★ 5
Great shirt
Color: Royal Blue, Size: XX-Large
The shirt was beauntiful. Lightweight which is perfect for my husband and it matches my dress for a wedding we’re going too
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Reviewed in the United States on May 29, 2026