I took these steps to set it up when it worked. If you search in the forums, it will work in the US. Again, it was working until yesterday. I had not changed settings.

Thanks

1) In Control Panel, open Accounts
2) Click New/Edit to create a Google Talk account with your google account credentials
3) In View Contacts, add/edit a contact
4) In field field "google talk", type +1xxxyyyyyyy@sms.talk.google.com (replace x and y w/ area code and phonenumber)
5) Select contact & start the chat (or start chat & select the contact)
6) Ignore the message "Contact is unauthorized. Unable to guarantee that messages will be delivered."