Frankly, what is most interesting is the fact that your systems are trouble-free. Certainly if you were to ask if such systems could be put into production, you would probably be advised not to expect much.
One last thing. I have a somewhat special PSTN connection. I subscribe to comcast digital phone which is dial-tone through the cable tv network! Every installation includes an APC unit that is plugged into the subcriber's power to maintain dial-tone in case of a power outage but I'd also venture that the subscriber's power is tapped to drive ringing as well. Isn't that convenient? Instead of the cable company paying the electric utility for driving ring voltage you the subscriber do that directly.
There seem to be a lot of variables with these TDM400s.
Cheers,
Jim.
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