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The product, as received, was pre-loaded with an obsolete version of the manufacturer's firmware. This made it incompatible with the manufacturer's own remote administration system. Downloading and installing the current version of this firmware corrected the problem. The product now works as advertised. Ideally, this product should be shipped to an end-user ready for plug-and-play installation according to the user guide supplied with it. But with obsolete firmware, it is not ready for use by a non-technical end-user.
Its a little daunting to configure, but if you are tech savvy you can plug your standard telephones into this device and have a super land-line using your internet. Nationwide local calling, over 40 features, including spam filtering, and save a lot of money if you choose the right VoIP company to serve as your telephone company. I like CallCentric.
I understood when ordering this product that it would need configuration to function properly. However, I have not been able to get a response from grandstream's tech support after several attempts. I am very disappointed in this company and will be returning the ATA.