I have a D-Link 4 port wireless router. Right now, all 4 ports are occupied by 2 PCs, a networked hard drive and print server. I need to add 2 VoIP modems (from SunRocket). What do I need to buy? A switch or another router? What setup do you suggest? Thanks in advance for your help! 
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You just need a 4 port switch or hub. I would suggest unplugging the print server and connecting the switch/hub to that port on your router, then connect the print server and voip modems to the Switch/hub.
Question... Are you sure you can have two VOIP modems connected to 1 phone line? I dont think that will work..