Originally Posted by EV607797
Don't forget that this is a two-pair system and it is polarity-sensitive. In addition, the second pair's polarity must be reversed, as in tip-yellow, ring-black.
Ed I think, you might be thinking of the Inter-tel Premier ESP. They did indeed have the second pair reversed and if you didn't you just popped the fuse on the station card and brought all six phones down until you replace the 1A fuse.


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