I'm working on a QoS job and we're not trusting the phones. I presume that most everyone has heard of the hacking that some fellows did to break into a hotel's network by using a small program that made their PC look like a Cisco phone. The switch then trusted the phone-a-like-PC and they...

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 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...