VOIP does not work via E4200 router

I have a new Polycom Soundpoint IP550 VOIP phone that was not connecting via my old WRT54GS router. I purchased a new router, the E4200, thinking it was just the age of my original router. It also will not allow the VOIP traffic through. I can connect the VOIP phone directly to my CenturyLink modem and it works. But when I connect it back to the router it stops.
I contacted Cisco support and they had me upgrade the firmware to 1.0.02 build 13 May 24, 2011 version. Also adjusted down the MTU to 1364. That still did not work so they told me to take the router back to the store. I have not done that yet as I want to ensure that the router is really broken and not that I am missing a setting. The tech said that I should be able to plug the VOIP phone into the router and make NO additional changes.
Anyone have any ideas of what I am doing wrong? Thanks.

192.168.1.1--->Administration---> and change SIP ALG to enabled.
I don't work for Cisco. I'm just here to help.

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