|If the house phone is cordless you will need to purchase a new router on wireless 5Ghz frequency - your cordless phone will be on 2.4Ghz.|
If you house phone is good ol' fashioned cable then you have either missed a micro filter from 1 of your phone points or you have an internal wiring fault.
Intel Core 2 Duo E6420
2x1Gb Corsair XMS2 DDR2-800Mhz
500GB Cavier Blue
500W FSP Bluestorm PSU