Cisco Cisco TelePresence MX700 Guida Utente

D15029.01 Troubleshooting Guide TC6.0, April 2013.

Capturing system logs

To capture the system logs you can do this from the web interface, see “Accessing the system using

the web interface” on page 5:

•

admin.

•

First click

Diagnostics

on the upper navigation bar and then

Log Files

•

You will now see a list of

Current Log Files and Historical Log Files. All Current logs can be

downloaded as a single compressed file. Scroll to the end of the

Current logs section for this

button. The same is applicable to the

Historical Logs. Scroll to the end to see the Download

all log files button.

SIP and H.323 call flow logging

You can capture log information on calls in two different methods on the video system. The first is to

enable either Sip or H.323 logging commands to capture the signaling messages you are interested

in. The advantage of this method is that, it works with encrypted calls and is easy to setup. The other

method is to collect a packet capture from the system so that all call signaling, media and all other

interactions with any external system (TMS/CUCM), HTTp etc. is captured. This method is takes a little

more effort but will capture more information in non-encrypted call scenarios. This can be useful when

diagnosing media issues.

Capturing SIP and H.323 signaling messages

•

restart your codec. This will ensure that the log files are empty when you start logging.

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admin.

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For Sip enter the command:

log ctx sippacket debug 9.

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For H.323 enter the command:

log ctx h323packet debug 9.

•

All log message output will now be sent into the

application.log file under current logs.

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Now place the call and re-create the problem.

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Hang up the call.

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Turn off the logging you enabled, by either

log ctx sippacket debug off or log ctx

h323packet debug off

Tip

You can press up arrow to repeat last command and delete

the 9 and add off.

•

From the web interface navigate to

Diagnostics -> Log Files

. Under

Current logs select

eventlog/application.log to see the logging messages.

Packet capture

You can capture the traffic from using port spanning on your switch (or use a hub), or directly from the

video system. The latter is in many cases easier, although there are some limitations.

To capture directly from the system requires root access (see ”Appendix B – Gaining root access to your

system” on page 33) and will use tcpdump to capture all information entering and leaving the system.

The advantage of this method is that, if you capture a complete call it can be opened in Wireshark and

analyzed graphically. There are however a few limitations to watch for when using this method.

if you are using Sip, set the default transport to

TCP. Otherwise the call signaling might be encrypted

and you will not be able to see the call signaling. if you are having media issues, place calls without

encryption so that the media can later be analyzed.

logging can be captured for around a maximum of 10 minutes before the internal memory is filled

and the logging stops, so if you are interested in capturing long calls use port spanning on your switch

instead and Wireshark on a pC to capture.

in order to later analyze the call in Wireshark, it is recommended to capture the complete call. Start the

capture before the call is made and stop it after the call has been disconnected.

Troubleshooting Guide TC6.0