How can you connect in multiline telephones multiline telephone jack without canceling each other? Not sure what you mean by cancel each other. A typical multi-line telephone has a single line 1 / 2 selector switch between the inner pair (red / green) and the outer pair (black / yellow) lines of a four conductor outlet. Since the phone only selectively using a pair at a time, not the cancellation must occur.
Buy and Gigaset handsets. 5.8.
Posted on May 8, 2010.