http://www.google.com/talk/developer.html#service 3. Do service providers need explicit approval to federate with the Google Talk service?
No, there is no paperwork involved. Service providers just need to support the XMPP standard for server-to-server federation and their users will be able to talk to our users (and vice versa). Yang menggunakan server Jabber sekarang bisa ngobrol dengan user Google Talk, tentu sebaliknya juga. -- Jay
