Buffer tuning has long been an interesting topic for me. I recently found a blog post by Brough Turner, who wrote an interesting article about a potential misconfiguration of AT&T wireless routers that cause ping round trip times to be either < 200ms or around 8000ms (yes, 8 seconds!). http:/...

If you are like me, you probably have a long list of projects around the house and many of them in an unfinished state. How does that happen? For me, I'm usually working away when I come to the point where I 1) Don't have the right tool, 2) ran out of something or 3) am interrupted by a phone...

Have you ever used the OSI model to aid your troubleshooting? I've been able to use it to help me isolate the causes of problems and focus my troubleshooting to solve problems quickly. Many years ago I encountered a problem that has become a good interview question. I was at a prospect's site...

I attended VoiceCon Orlando 2009 this week and had the priviledge of participating in three events: Teaching a half-day tutorial on "VoIP Troubleshooting, Monitoring, and Metrics" in which I covered a number of VoIP problems, what their symptoms are, and how to correct them. I then covered...

The Cisco Press book Troubleshooting Cisco IP Telephony , is a gem. I spoke on troubleshooting VoIP in converged networks at VoiceCon this week (see the prior post) and some of the ideas for problems came from this book. It is easy to read and is organized in a way that also allows it to be used as a...

I'm speaking at VoiceCon San Francisco 2008 on the topic of Troubleshooting in Converged Networks. That's a fancy title to say that I'll be talking about VoIP troubleshooting. There are three excellent speakers this time around: Steve Guthrie of CA, Mike Hollier of Psytechnics, and me. The...

I'm doing my presentation titled Troubleshooting Converged VoIP and Data Networks at Interop New York on September 17 at 1:30pm. The session title is Troubleshooting Converged Networks . It has been a well-received topic at prior VoiceCon shows and speaking at Interop gives me the opportunity to...

I've done a few seminars on troubleshooting VoIP at VoiceCon (Fall 07 and Spring 08). Somewhere along the way, someone mentioned a relatively new web site to me: voiptroubleshooter.com I finally took time today to look at it. The content is potentially useful, depending on your level of expertise...

VoIP troubleshooting is a pretty interesting problem. (See my earlier blog entry regarding my talk at VoiceCon Fall 2007.) There are a large number of tools that look at packets on the wire, or look at the RTCP (Real Time Control Protocol) stream from certain phones, or gather data from the call controllers...