if he is a tech enthusiast he will know what line noise is and how it can degrade the signal to your modem causing it to lose the connection. when you are having internet problems (i.e. he is using the VOIP), call your ISP. they can check to see the strength of your modem's connection
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CPU || e8400
RAM || 4GB corsair xms2 pc6400 800mhz
HDD || 2x WD Raptor 150GB 2x WD 500GB
MBO|| EVGA 680i SE
GPU || Evga 8800GT Superclocked w/ Accelero
PSU || Silverstone 750 watt
Case|| Antec p182
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