Can this work with Cisco phone system?

Not clear what you mean by "Cisco phone system". The Grandstream HT-812 is an ATA (Analogue Telephone Adapter). You connect it to your internet router via ethernet cable. You plug in two phones or similar (eg CO ports on a PABX). It provides Voice over IP service from the likes of SIPgate. It's configured via a web interface.

Can you connect dialup modems to this? i would like to simulate a dialup isp for an old computer.

I am not sure that anyone would have attempted to use a dial-up modem over VOIP but there has to be a first time however unlikely. The HT-812 supports fax so I can see no reason why it would not work with an acoustic modem so I think I would go ahead and try. There is a single channel version which is cheaper so would provide a cheaper option. If you do try, do post the answer in a review because I would be interested in the outcome!

What is the difference between the ht812 & the ht802?

The HT812 has an integrated Gigabit NAT router and the HT802 does not. You don't need to use the integrated Gigabit NAT router, it can de disabled and it will work in the exact same way as the HT802.

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Grandstream HT-812 2FXS Gateway, Black

Product ID: 50395851

Details

Brand
Grandstream
Model Name
HT812
Special Feature
WPS
Compatible Devices
Personal
Recommended Uses For Product
Security
Included Components
1

🌐Dual Gigabit ports for lightning-fast connectivity

📞2 FXS ports for analog device integration

🔒TLS & SRTP encryption for secure calls

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€ 210.80

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Sold byAmazon CyprusDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

📞 Elevate your office calls with secure, lightning-fast VoIP connectivity!

BUILT IN NAT ROUTER - Simplify your setup with an integrated NAT router that handles routing without extra hardware.
ROCK SOLID CALL SECURITY - Advanced TLS and SRTP encryption protect your calls and accounts from eavesdropping.
TRUSTED GLOBAL TECHNOLOGY - Join millions worldwide using Grandstream’s market-leading SIP ATA technology for crystal-clear voice quality.
BLAZING FAST NETWORK PERFORMANCE - Dual Gigabit ports ensure ultra-reliable, high-speed data routing up to 100Mbps.
SEAMLESS ANALOG TO VO IP INTEGRATION - Connect your legacy phones effortlessly with 2 SIP profiles via 2 FXS ports.

The Grandstream HT-812 2FXS Gateway is a compact, powerful ATA device designed to bridge analog phones with modern VoIP networks. Featuring 2 FXS ports, dual Gigabit Ethernet, a built-in NAT router, and advanced TLS/SRTP encryption, it delivers exceptional voice quality and secure communication for home and office environments.

Specifications

ASIN	B01M2ZJQAF
Best Sellers Rank	93,222 in Computers & Accessories ( See Top 100 in Computers & Accessories ) 709 in Routers
Guaranteed software updates until	unknown
Item model number	HT-812
Language	Dutch
Manufacturer	Grandstream
Product Dimensions	22.86 x 33.02 x 7.11 cm; 290 g

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