Voip Phone To Phone Anyone Know Company That Provide VoIP Phone Adaptor -Linksys?

Anyone know company that provide VoIP Phone Adaptor -Linksys? - voip phone to phone

I've heard that it is service in the U.S. (The company will provide a VoIP telephone adapter from Linksys and phone number so you can call the U.S. free anystate costs.
And with the DSL connection, you can use the U.S. call from anywhere.
?
Plz help me - Thank you.