I have a small tourist accommodation and provide a password protected wifi for guests to use.
I now want to install VOIP phone in each unit, what is the best way to prevent the LAN cable to the IP phones being used to obtain un-metered internet access other than physically making the plugs inaccessible?
Could I use the MAC addresses of the phones and prevent any other device from connecting?
I use Linksys WRT54GL routers for the wifi but would need to buy another router to provide extra sockets for the 7 or so phones. Any recommendations on routers?

MAC filtering is effectively useless as spoofing it is relatively easy. Perhaps setup rules so everything except traffic over voip is filtered no matter where it comes from?

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