Hi All, The reason for the question was simply that the customer desired some solution called an "AOR" or Area of refuge - I think it was. Basically a call button, microphone and speaker to hear back with the kicker being "a long distance" the solution has to run. RS485 is like 4000 feet.
There are solutions our there apparently that are not built on asterisk - so I was just trying to find a solution that potentially worked with asterisk. Thanks! Jerry
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