With captures on both sides, you can view the packets being transmitted from one gateway and then see how those packets arrive at the other gateway and vice versa. When troubleshooting the IP network with packet captures, it is best to grab a capture at each of the gateways. The Wireshark software is used for the examples in this book and is available as a free download from. ![]() NOTE Although there is an abundance of packet-capturing software available, the easiest to acquire and use is probably Wireshark. In addition, you can observe not only the incoming media stream, but also the outgoing one to ensure that the gateway is properly transmitting packets as it should. Packet captures provide an unbiased, third-party view of what is occurring on the IP network. The best way to troubleshoot the IP portion of a fax/modem/text call is with a packet capture.
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