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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
4.3 ★★★★★
Based on 1627 reviews
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Product Reviews
★★★★★ 5
Best tasting!
Flavor Name: Butterscotch
Fantastic flavor. All thumbs up. Have purchased many other commercial butterscotch flavors. This is my favorite.
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Reviewed in the United States on March 23, 2026
★★★★★ 5
The taste is yummy
Flavor Name: Butterscotch
Delish!
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Reviewed in the United States on March 27, 2026
★★★★★ 5
great flavor
Flavor Name: Butterscotch
great flavor.
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Reviewed in the United States on March 23, 2026
★★★★★ 5
Works great for butterbeer
Flavor Name: Butterscotch
Taste delicious. I bought this to make a Harry Potter butterbeer and it works well.
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Reviewed in the United States on March 27, 2026
★★★★★ 5
Great product, thoughtful design, great customer service
Color: Black, Size: 40 oz
I don't write a lot of reviews, but I felt like this product deserved one. This is an excellent cold brew maker. It is very easy to use and has a great 1,200 mL capacity. The plastic construction is more versatile (less fragile) than other brewers made from glass. The filtration system eliminates the sludge that other brew systems leave. The packaging is very thoughtful - a scoop and sponge are included. The scoop is easily overlooked, but it is the perfect size to clean the used grounds out of the filter. The sponge is an unexpectedly useful form factor to help with cleaning. Hopefully the sponges can be ordered separately, since sponges don't last forever.
Some minor downsides:
Cleaning is moderately easy, but the only component that is recommended for the dishwasher is the pitcher (which is also easiest to clean by hand). All of the other elements are recommended for hand washing, which doesn't take long.
The way the filter is configured, the pitcher will work most effectively if stored (at least for part of the brew cycle) on its side. However, there is a vent in the lid that is prone to leaking when the pitcher is stored on its side. Brewing upright can lead to the top grounds not getting exposed to water.
Unfortunately, one of the pieces broke during routine use after a couple of months: the pitcher lid is attached with a couple of hinges that snap the lid into place on the pitcher. One of the hinge attachments broke. I contacted customer service and a replacement pitcher arrived four days later. I'd recommend being careful with these hinge attachments as they seem prone to break. At the same time, the customer service is very responsive and suggests that they take support of their products seriously.
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Reviewed in the United States on May 1, 2025