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Question: VOIP not working with my TEW-633GR???

Hi all, I would greatly appreciate it if someone can give me some advice on solving my network problem here with my newly purchased Trendnet TEW-633GR N router. I have WLAN for laptops and LAN for VOIP phone. The problem is that whenever I'm in use of the VOIP phone(LAN connection) none of my WLAN laptop connections work. So... it seems I can either pick LAN or WLAN at a time, can't be both. Any thoughts??? Thanks