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<?xml version="1.0" ?>
<node name="/Channel_Interface_Media_Signalling" xmlns:tp="http://telepathy.freedesktop.org/wiki/DbusSpec#extensions-v0">
<tp:copyright> Copyright (C) 2005, 2006 Collabora Limited </tp:copyright>
<tp:copyright> Copyright (C) 2005, 2006 Nokia Corporation </tp:copyright>
<tp:copyright> Copyright (C) 2006 INdT </tp:copyright>
<tp:license xmlns="http://www.w3.org/1999/xhtml">
<p>This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.</p>
<p>This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.</p>
<p>You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.</p>
</tp:license>
<interface name="org.freedesktop.Telepathy.Channel.Interface.MediaSignalling">
<tp:requires interface="org.freedesktop.Telepathy.Channel"/>
<tp:requires interface="org.freedesktop.Telepathy.Channel.Type.StreamedMedia"/>
<method name="GetSessionHandlers">
<arg direction="out" type="a(os)"/>
<tp:docstring>
Returns all currently active session handlers on this channel
as a list of (session_handler_path, type).
</tp:docstring>
</method>
<signal name="NewSessionHandler">
<arg name="session_handler" type="o">
<tp:docstring>
Object path of the new MediaSessionHandler object
</tp:docstring>
</arg>
<arg name="type" type="s">
<tp:docstring>
String indicating type of session, eg "rtp"
</tp:docstring>
</arg>
<tp:docstring>
Signal that a session handler object has been created. The client
should create a session object and create streams for the streams
within.
</tp:docstring>
</signal>
<tp:property name="nat-traversal" type="s">
<tp:docstring xmlns="http://www.w3.org/1999/xhtml">
<p>A string indicating the NAT traversal techniques employed by the
streams within this channel. Can be protocol-specific values, but the
following values should be used if appropriate:</p>
<dl>
<dt>none</dt>
<dd>No attempt should be made at NAT traversal.</dd>
<dt>stun</dt>
<dd>If appropriate, a STUN request should be made to the given server
to open a UDP port mapping and determine the external IP.</dd>
<dt>gtalk-p2p</dt>
<dd>Google Talk peer-to-peer connectivity establishment should be used,
as implemented in libjingle 0.3.</dd>
</dl>
</tp:docstring>
</tp:property>
<tp:property name="stun-server" type="s">
<tp:docstring>
The IP address or hostname of the STUN server to use for NAT traversal.
</tp:docstring>
</tp:property>
<tp:property name="stun-port" type="q">
<tp:docstring>
The UDP port number to use on the provided STUN server.
</tp:docstring>
</tp:property>
<tp:property name="gtalk-p2p-relay-token" type="s">
<tp:docstring>
The authentication token for use with the Google Talk peer-to-peer relay
server.
</tp:docstring>
</tp:property>
<tp:docstring>
An interface for signalling a channel containing synchronised media
sessions which can contain an arbitrary number of streams. The negotiation
interface is based closely around the API of the Farsight library
(http://farsight.sourceforge.net/). This in turn is based upon the IETF
MMusic ICE drafts where connections are established by signalling potential
connection candidates to the peer until a usable connection is found, and
codecs are negotiated with an SDP-style offer and answer. However, the
principles should be applicable to other media streaming methods and the
API re-used without difficulty.
</tp:docstring>
</interface>
</node>
<!-- vim:set sw=2 sts=2 et ft=xml: -->
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