Check out the latest emails to the standards-JIG list. The important thing to note here are the authors of these documents…

Title: Jingle Signalling

Abstract: This document defines signalling methods for initiating and managing peer-to-peer sessions (e.g., voice and video exchanges) between XMPP clients in a way that is interoperable with existing Internet standards.

URL: http://www.jabber.org/jeps/inbox/jingle.html

Title: Jingle Audio

Abstract: This document defines a session description format for Jingle audio sessions.

URL: http://www.jabber.org/jeps/inbox/jingle-audio.html