From our announcement to the Jingle mailing list:
We are pleased to announce that we have launched support for JingleIf you're interested in interoperating with the Google Talk service, you can now refer to the public XEP-0166 and XEP-0167 documentation for implementing call signaling.
XEP-166 and XEP-167 for Google Talk calls to and from Gmail, iGoogle,
and Orkut. We have also added the same level of support to libjingle
(http://code.google.com/p/libjingle), which is used by many native
clients. From this point on, it will be our primary signalling
protocol, and the old protocol will only remain for backwards
If you're interested in the differences between the old and new protocols, you can also see the old "Gingle" protocol documentation on our developer site.