Press “stop” when you think you’ve captured what you want. Press “go” and Wireshark will then record every IP packet that comes to or from your PC. Essentially, you begin by telling Wireshark to capture the packets on a particular interface (e.g. There are a number of great tutorials on the Internet to help you understand the fundamentals of how to capture IP packets so I won’t attempt to repeat those instructions in any detail. Using Wireshark for SIP is pretty simple. Wireshark will capture and display SIP messages. ![]() Do you want to know what happens when you transfer a SIP call? You guessed it. Do you want to know what happens when you surf the web? Use Wireshark to capture and display HTTP and HTML messages. Do you want to know how Address Resolution Protocol works? Use Wireshark to capture and display ARP messages. Wireshark is a free packet tracing tool that captures, formats, and displays IP packets. My tool of choice for dissecting call flows is Wireshark. They make those calls and then wade through SIP messages to understand exactly what happened behind the curtain. While seeing those things from a user’s standpoint is important, I get them down and dirty with the protocol itself. They install a SIP soft phone to make calls, change their presence status, send instant messages, and invoke call features such as conference, transfer, and hold. One of the reasons why they leave class with more than just a “book learning” is that we put SIP to work. My students learn as much as anyone could be expected to learn about SIP in such a short period of time. We start with the basics of SIP before going through every message type, all the important responses, call flows, media, security, and even touch on cloud communications. It’s only a two and a half day course, but it’s a very intense two and a half days. ![]() I am talking about the SIP class that I teach every few months. While it’s not the same as tenure at an Ivy League university, I am able to develop curriculum and impart knowledge to willing pupils. Thankfully, I do have an opportunity to periodically stand in front of a bunch of students and play professor.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |