Summary: At the price point of this device, have been shocked at just how well (and how consistently) this unit works. NOTE: this device expects to NAT anything "behind it" (ie: devices plugged into "it's" LAN side). Thus, you must use the WAN port. If you are using it behind your firewall, simply enable the management services/ports on the WAN port to control it. Basically it can act as a simple router for those who may need that functionality.
Pros: Has a wide variety of features. Supports many common configurations and scenarios that you would want. Extremely reliable and stable.
Summary: This will also work on rotary dial phones. Many configuration options if you are interested. You will need to specify a dialing string if you don't want to dial area code in front of local calls.
Pros: Works, Period. I tried a Linksys ATA adapter and had trouble with it from day one. The port that the phone plugged into was dead. Poor quality control on Linksys end. The Grandstream HT502 was recommended to me by my VoIP/SIP provider, Vitelity. The settings were posted on their support site and worked perfect on this device. Has run a few months with never having to reboot the device.
Cons: Had to plug the Ethernet cable from my router into the WAN port on the Grandstream instead of LAN port. Not sure why and it was not described in the manual, but once connected to WAN, it works fine.
so I recommend it. You might need help for its configuration ...
7 March 2015
Summary: I've had no problem with this ATA for six months now, so I recommend it. You might need help for its configuration though. I used it to hook up to the freephoneline free VoIP service, and their forum suggest the complete configuration for the device, for that provider.
Summary: This little box is very much like the Linksys (Cisco) SPA 2102 - widely used by ISPs who provide digital phone services. It seems to work quite well, but is rather short on documentation, especially considering the very extensive number of settings in the web admin. I like having the LAN port to connect my computer through, reducing the number of cables and connections to the router. However, i could not get this working without bridging my computer to the main router.