It's a classic example of over purchase

Only ONE router should be present and currently, by your setting, make your wireless router a wireless ACCESS POINT. This will make your VoIP router to issue intranet IP and your wireless router will not try to resolve that.
But if VoIP is from Linksys, it's better to have the wireless router as the only router and connect VoIP at the end. How many computers do you have that you need two routers? If you installed wireless router to roam around your house, place the wireless router in the middle and then add VoIP at the end.
There is also a good chance that if you have cordless telephone, it might be interferring with your wireless channel. Switch your wireless channel from 1 thru 11(?) and see which works the best.
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