Do any of you electronics gurus know how to piece a circuit together that will allow me to switch between using two different handsets on a regular ole telephone? Basically, I Buy Drugs Without Prescription need an A/B switch, but there are four conducters per handset. I want to mount a tiny switch on the side of my telephone that will allow me to send the telecom to either one of two handsets. Any ideas where I can find such a schematic and what parts I’ll need?

Thanks in advance.