Another way to check the status of a call, for example, is by using a network protocol analyzer, such as Wireshark (http://www.wireshark.org/). This program allows us to capture all network traffic moving through our network devices.
Select the interface connected to the LAN or VLAN where our IP-PBX is and apply the filter to capture all packets from port 5060 (SIP). If we'd like to capture IAX protocol calls, we can specify the filter option as follows:
udp port 4569. This is shown in the next image:
Click on the Start Capturing button and we will start seeing the flow of SIP packets through our network device, as shown in the next image:
After capturing the packets, we can select the Statistics | Flow Graph menu to see the flow of packets from an SIP call in a more graphic way, as shown in the next screenshot:
The next image shows the flow of a call by using the SIP protocol:
If for any reason we do not specify a port for capturing traces and we capture...