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<!-- WSUG Chapter Telephony -->
<!-- $Id$ -->
<chapter id="ChTelephony">
<title>Telephony</title>
<section id="ChTelIntroduction">
<title>Introduction</title>
<para>
Wireshark provides a wide range of telephony related network statistics
which can be accessed via the <command>Telephony</command> menu.
</para>
<para>
These statistics range from specific signaling protocols, to analysis of
signaling and media flows. If encoded in a compatible encoding the media
flow can even be played.
</para>
</section>
<section id="ChTelRTPAnalysis">
<title>RTP Analysis</title>
<para>
The RTP analysis function takes the selected RTP stream (and the reverse
stream, if possible) and generates a list of statistics on it.
</para>
<figure><title>The "RTP Stream Analysis" window</title>
<graphic entityref="WiresharkTelRTPStreamAnalysis" format="PNG"/>
</figure>
<para>
Starting with basic data as packet number and sequence number, further
statistics are created based on arrival time, delay, jitter, packet size,
etc.
</para>
<para>
Besides the per packet statistics, the lower pane shows the overall
statistics, with minimums and maximums for delta, jitter and clock skew.
Also an indication of lost packets is included.
</para>
<para>
The RTP Stream Analysis window further provides the option to save the RTP
payload (as raw data or, if in a PCM encoding, in an Audio file). Other
options a to export and plot various statistics on the RTP streams.
</para>
</section>
<section id="ChTelVoipCalls">
<title>VoIP Calls</title>
<para>
The VoIP Calls window shows a list of all detected VoIP calls in the
captured traffic. It finds calls by their signaling.
</para>
<para>
More details are described at the
<ulink url="&WiresharkWikiPage;/VoIP_calls"/> page.
</para>
</section>
<section id="ChTelLTEMACTraffic">
<title>LTE MAC Traffic Statistics</title>
<para>
Statistics of the captured LTE MAC traffic. This window will summarize the
LTE MAC traffic found in the capture.
</para>
<figure><title>The "LTE MAC Traffic Statistics" window</title>
<graphic entityref="WiresharkStatsLTEMACTraffic" format="PNG"/>
</figure>
<para>
The top pane shows statistics for common channels.
Each row in the middle pane shows statistical highlights for exactly one UE/C-RNTI.
In the lower pane, you can see the for the currently selected UE/C-RNTI
the traffic broken down by individual channel.
</para>
</section>
<section id="ChTelLTERLCTraffic">
<title>LTE RLC Traffic Statistics</title>
<para>
Statistics of the captured LTE RLC traffic. This window will summarize the
LTE RLC traffic found in the capture.
</para>
<figure><title>The "LTE RLC Traffic Statistics" window</title>
<graphic entityref="WiresharkStatsLTERLCTraffic" format="PNG"/>
</figure>
<para>
At the top, the check-box allows this window to include RLC PDUs found
within MAC PDUs or not. This will affect both the PDUs counted as well
as the display filters generated (see below).
</para>
<para>
The upper list shows summaries of each active UE.
Each row in the lower list shows statistical highlights for individual
channels within the selected UE.
</para>
<para>
The lower part of the windows allows display filters to be generated and
set for the selected channel. Note that in the case of Acknowledged
Mode channels, if a single direction is chosen, the generated filter will
show data in that direction and control PDUs in the opposite direction.
</para>
</section>
<section id="ChTelXXX">
<title>The protocol specific statistics windows</title>
<para>
The protocol specific statistics windows display detailed information
of specific protocols and might be described in a later
version of this document.
</para>
<para>
Some of these statistics are described at the
<ulink url="&WiresharkWikiPage;/Statistics"/> pages.
</para>
</section>
</chapter>
<!-- End of WSUG Chapter Telephony -->
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