I know this is not wireless but I see you guys do Vonage so any help is welcome.

I have a linksys pap2 vonage adapter which works great. I recently purchased a Q-See 4channel DVR with RJ45 port and noticed that the voice quality got severerly degraded when I put it in the network. Suprisinglyl when I get a second router and put it after the first and connect vonage to the first router and the DVR to the second it works great ... please help