Call forwarding without hacking an account? If someone could get a 2.5mm jack for a wired cell phone headset, or just the headset itself, and find the wires that are used for the microphone; one could connect it to the red and green wires in the beige box and then to the cell phone. If the cell phone could be set up to automatically answer a call when a headset is set up, then someone could call it up and listen on the lines the beige box is connected to.
beige box
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R headset jack G
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To cell phone
Example: Call up cell phone from home phone, cell answers and plays whatever is on the beige box line. Play DTMF tones and you are now able to call from that other line.
Is this remotely possible?