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diff --git a/Plugins/jingle/libjingle/talk/p2p/base/sessionclient.h b/Plugins/jingle/libjingle/talk/p2p/base/sessionclient.h
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+/*
+ * libjingle
+ * Copyright 2004--2005, Google Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  1. Redistributions of source code must retain the above copyright notice,
+ *     this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright notice,
+ *     this list of conditions and the following disclaimer in the documentation
+ *     and/or other materials provided with the distribution.
+ *  3. The name of the author may not be used to endorse or promote products
+ *     derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+ * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _CRICKET_P2P_BASE_SESSIONCLIENT_H_
+#define _CRICKET_P2P_BASE_SESSIONCLIENT_H_
+
+namespace buzz {
+class XmlElement;
+}
+
+namespace cricket {
+
+class Session;
+class SessionDescription;
+
+// A SessionClient exists in 1-1 relation with each session.  The implementor
+// of this interface is the one that understands *what* the two sides are
+// trying to send to one another.  The lower-level layers only know how to send
+// data; they do not know what is being sent.
+class SessionClient {
+ public:
+  // Notifies the client of the creation / destruction of sessions of this type.
+  //
+  // IMPORTANT: The SessionClient, in its handling of OnSessionCreate, must
+  // create whatever channels are indicate in the description.  This is because
+  // the remote client may already be attempting to connect those channels. If
+  // we do not create our channel right away, then connection may fail or be
+  // delayed.
+  virtual void OnSessionCreate(Session* session, bool received_initiate) = 0;
+  virtual void OnSessionDestroy(Session* session) = 0;
+
+  // Provides functions to convert between the XML description of the session
+  // and the data structures useful to the client.  The resulting objects are
+  // held by the Session for easy access.
+  virtual const SessionDescription* CreateSessionDescription(
+      const buzz::XmlElement* element) = 0;
+  virtual buzz::XmlElement* TranslateSessionDescription(
+      const SessionDescription* description) = 0;
+
+protected:
+  // The SessionClient interface explicitly does not include destructor
+  virtual ~SessionClient() { }
+};
+
+}  // namespace cricket
+
+#endif // _CRICKET_P2P_BASE_SESSIONCLIENT_H_