CME Help

I am installing a CME at a customer site where their current phone system is divided between 2 companies. This CME will have 4 POTS lines for one business and 2 lines for the other. How do I make it where the 2 lines only work from certain phones and the 4 lines work from others? I've been searching Google and can't find what I'm looking for! Any help will be greatly appreciated!


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