just pull all the lines off the MICS , make three test calls and see what happens to the third call

when it returns busy then its in ATT's court

have you tried dialing the third line directly to see if it rings or returns busy ?

while Arthur's scenario is appealing there is really no need to have phones physically attached and to go through the time and expense

9 2500s @ 30 is 270 you really dont need to spend if you dont have a recurring use for 2500s

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Serving SW and West central Fl since 1984