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Hi, first time poster. I've searched, but find very little on this topic. My church has only 2 incoming phone lines (copper), being serviced by Digum TDM400 card. The existng phone system (being replaced) was a key system, easy for users to tell both lines were in use. We have chosen Polycom 430 phones for the new system, and from what I can tell, I'm only going to have a single