You'll need a crossover T1 cable. It's best if the 2 systems have different numbering plans. For example, 2xxx on one and 3xxx on the other. You'll need to setup routing with destination codes to call between the systems, and target lines to receive calls at each end.
One more question about the mics side. This will be the second pri on it, the first is for dial tone. When i go in and program it up is says clear lines. It won't clear my target lines will it. Thanks,
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