Due to excess of accessories over number of ports on my dsl modem/router
(Speedstream 5681) I have interposed a GigaFast EZ500-S   10/100 Mbps
NWay Switch to serve a printer and computers.  These work fine, but my two
VoIP adapters cannot complete the login process so the VoIP numbers do
not function when their adapters' lan cables pass through the switch instead
of to the router directly.  The diagnostic message on the Linksys IP phone
display suggests it is stalling at a DNS lookup.

I'd appreciate if someone could either tell me what I am doing wrong, what
is the simple fix, or what more I need to read or do to educate myself to
diagnose and solve this kind of problem on my own.

Jeffrey Race