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Splitter on wall jack? Help please?

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Splitter on wall jack? Help please?

I tried splitting a phone line with a regular splitter (turns one jack into two: one male end, two female) Each individual line will work when plugged in alone but as soon as I plug both lines in, neither phone will work. These are multi-line phones (this was at work) and I'm wondering if I just got a bad splitter (although I'd think if that were the case nothing would work) or if you can't split lines the with digital voice or multi-line phones?