the extension in my room connects to my computer and the other one is connected to my telephone unit (cordless phone).(i bought a wire that can connect all of them).i wanted to add another unit (a corded phone) but when i connected it,everytime the phone rings it doesn't make a full ring,only half ring then nothing.(but i can still answer the phone and the person calling is still on the other line).my question is,why does it only make a half ring when i added another telephone unit?
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