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IP PBXs USER MANUAL
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13.3.3 Ethernet Capture
Ethernet capture uses TCPDUMP which is a common pocket analyzer allows users to capture TCP/IP and other packets being transmitted
or received over a network to which the Vox IPPBX is attached. The captured packets can be downloaded from the IPPBX system and
been analyzed on your Windows PC to display the SIP traffic details. It can be used to debug a VoIP call problem.
Path:
Maintenance -> Diagnostic -> Ethernet Capture
To capture the network traffic, you need to select the network interface according to on which the IPPBX system is working on. Then click
on button to start capturing the network traffic.
Once the process begins, the Start button will change to Stop. At this moment, you should make a call to recur the phone call problem or
ensure some other problem had recurred, so the captured network traffic could content errors that are helpful for troubleshooting. Once
done click on button, and the captured network traffic will be automatically downloaded.
The downloaded file could be analyzed by Wireshark or you could send the file to support team for help.
13.3.4 Channel Monitor
Channel Monitor, technically DAHDI Monitor allows you to monitor signal level on analog channel and record the output to a file.
Recorded audio files are by default raw signed linear PCM. You can play it to the speaker to listen to the phone call signaling on the
analog channel. Or you can use a sounds editor to visual display the audio level at both the Rx (audio Received by Asterisk) and Tx (audio
Transmitted by Asterisk).
Usually Channel Monitor can be used to capture the caller ID signaling of an FXO channel. If you are experiencing caller ID problem you
can perform channel monitor on the FXO port and then analyze the captured packets. If needed, you can send this file to support for
help.
Path:
Maintenance -> Diagnostic -> Channel Monitor
Before starting channel monitor, you need to select an FXO interface. Then click on button to capture signaling on the selected
interface.
Once the process started the button will change to Stop. Now you should recur the problem by making a call in through the selected
interface. When the extension started to ring the third time you may hangup and stop channel monitor by clicking on button. As
soon as the channel monitor stopped, the captured signaling will be automatically downloaded.
If you have knowledge of how to analyze the files you may open them with some sound editors like Wavepad, or you may send the file to
support team for help.