4. Do you plan to support other real-time communication protocols?
Google Talk supports XMPP with the beta release. We plan to support SIP in a future release. Additionally, we will evaluate other protocols as appropriate, to continue to deliver on our commitment to open communications.
5. What protocols are used for voice calls?
Google Talk uses extensions to XMPP for voice signaling and peer-to-peer communication. Source code and documentation for these extensions is now available.
In addition, these extensions are in the process of being reviewed by the XMPP standards body as official enhancements (known as JEPs) to the standard. Note that the source code for Google Talk's current implementation of these extensions varies slightly from the proposed specs. Upon ratification of the specs, Google Talk (and the source code) will be updated to be in full compliance.
In the future, we plan to support SIP signaling as well.
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