Yep, everyone is right on... a bridge should work fine. You can probably use your laptop as a bridge even, just turn on internet connection sharing...could be some NAT issues though.

An easy option is to get a linksys wireless router and flash it with dd-wrt (after I just slammed it in another thread ). Dd-wrt will allow the linksys to function as a bridge...works well too.

As far as VoIP is concerned, as long as its a true bridge, then you shouldn't have any problems at all- at least in terms of connecting to the network. Now, if the network is protected by NAT (which is most likely is) and there is no provision (IE pinhole, port forward, etc) for the VoIP adapter, then you may have issues with one way audio. I know absloutly nothing about that dlink VoIP thingy but if it does use SIP then you will probably have issues behind a firewall. If its a Skype adapter you'll be fine as skype traverses firewalls rather well (and very cool too I might add).

If its SIP, and you have audio issues, you might go back to the idea of using your laptop as a brige...just VPN into the network where your VoIP server lives and then bridge to the ethernet port on the laptop then plug the phone into your that port (may require a crossover cable)...and it will certinally require the stars to be aligned...a lot of VPN software doesnt allow bridging at all.

Good luck, let us know how it turns out!