This adapter is wired straight through as follows;
Since phone cords are made crossed, a crossed splicer would be needed to join wires made specifically for phone use. Please see our RJ1106XF-F for a crossed adapter made specifically for phone cables. RJ11 connectors with 2, 4 or 6 pins will work with this adapter. However, the skinny connector made for phone handsets will not work with this.