Fortinet fortivoice Administrator's Manual page 49

resolution is correct, and if the traffic is returning to the source as expected. You can also use
packet switching to verify that NAT or other configuration is translating addresses or routing
traffic the way that you want it to.
Before you start sniffing packets, you need to have a good idea of what you are looking for.
Sniffing is used to confirm or deny your ideas about what is happening on the network. If you try
sniffing without a plan to narrow your search, you could end up with too much data to effectively
analyze. On the other hand, you need to sniff enough packets to really understand all of the
patterns and behavior that you are looking for.
To capture voice and fax packets
1. Go to System > Network > Traffic Capture.
Figure 17: Traffic capture list
GUI field
Stop
Download
Name
Status
Size
2. Click New.
3. Enter a prefix for the file generated from the captured traffic. This will make it easier to
recognize the files.
4. Enter the time period for performing the packet capture.
5. If you choose SIP or Use protocol for Filter, from the Available peers field, select the
extension or trunk of which you want to capture the voice packets and click -> to move them
into the Selected peers field. You can select up to 3 peers.
6. If you want to limit the scope of traffic capture, in the IP/HOST field, enter a maximum of 3 IP
addresses or host names for the extensions and trunks you selected. Only traffic on these IP
addresses or host names is captured.
7. Select the filter for the traffic capture:
• SIP: Only SIP traffic of the peers you select will be captured.
• Use protocol: Only UDP or TCP traffic of the peers you select will be captured.
• Capture all: All network traffic will be captured.
8. For Exclusion, enter the IP addresses/host names and port numbers of which you do not
want to capture voice traffic.
9. Click Create.
Fortinet Technologies Inc.
Description
Click to stop the packet capture.
When the capture is complete, click Download to save the packet
capture file to your hard disk for further analysis.
The name of the packet capture file.
The status of the packet capture process, Complete or Running.
The size of the packet capture file.
Page 49 FortiVoice Enterprise Phone System 4.0.0 Administration Guide