Shared wireless Internet connection and VoIP adapter

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Greetings:

I have a question that I need some help with regarding sharing a
wireless Internet connection and using VoIP, let me explain what I am
would like to do. My sister who lives across the street from me has a
high speed (cable) Internet connection, she has a Linksys WRT54G
wired/wireless router and connects her PC directly to the router with
an Ethernet cable, she told me that if I buy a wireless card for my PC
that we could share the high speed (cable) Internet connection and
split the cost, sounds good so I bought a wireless card, everything is
working fine.

I want to also use VoIP in my house so I downloaded the CounterPath
X-Lite softphone and
configured it with help from my VoIP provider Teliax and it worked but
I was not happy with
the quality of the calls, I was told that a hardware adapter would give
me better results
than a softphone would so I purchased a Linksys SPA-1001 adapter, the
problem is that I can not get the Linksys SPA-1001 adapter to register
with Teliax.

Both my sister and I are running Windows XP on our PC's, the Linksys
WRT54G wired/wireless router at her house assigns us IP address via
DHCP, I sould mention that my PC has two network cards installed, one
is the wireless card that I use to connect to her Linksys WRT54G
wired/wireless router across the street and the other is a wired
network card that I have the Linksys SPA-1001 adapter connected to with
a crossover cable.

I would appreciate any help with this, I am thinking perhaps I need a
router of my own (I
have a Linksys WRT54GC that I could use), maybe it has something to do
with ICS or bridging the connections, or that Windows XP just needs to
go (I have been looking at Ubuntu anyhow), then again maybe it can not
even be done?

Thanks - Linda