OK--I'm in moan mode again. About phones through the computer. Now please don't think this is directed at you, wonderful parents-in-law, I have better respect for my quality of life than that!!
You know those telephones where you can phone other PC's for free, no matter where in the world you are???
I have tried microphones (from kiddies toy ones to professional mics)--no good. I bought a phone that plugs into the USB jack at the front of my computer--and get my music coming down the freaking handset and then nothing on the speakers. I've made the test calls, I've adjusted the properties on the sound and audio sections in the control panel. I've basically wasted far too much energy on this bloody stuff already!!!! The next step is to take every single piece of audio equipment, get a big sack, borrow a big sledgehammer and smash the lot until I find some modicum of comfort.
I'm giving it one last go this weekend, when I can concentrate. If it doesn't work I'm off to the neighbors and getting that hammer.