Thanks for the input, Patriot.
I am actually a software developer/consultant designing my own in house POS so I will have a greater ability to integrate the call answering user interface into my POS system.
However, this is not a trivial process so I will for some interim period of time face the same issue.
I am also using Nextiva for my VOIP provider. They have a demonstrated record of superior uptime on their end.
I like many of the aspects of the $199 system and the folks that created it are local to me. However, when I last spoke with them they did not have any avenue for me to integrate their product into the one I am developing, so I am not pursuing them as an option at this time.