Monthly Archives: June 2015

The Sound Science of Audio Codecs

I have never been happy with the answer “because.” No matter what the subject or question, I am not satisfied until I am told the whys, wherefores, and possible exceptions. While I can’t claim to fully understand every explanation I’m provided (I still don’t completely fathom relativity), I want the opportunity to try. I won’t […]

Converge2015: The Road to SIP

If you are a fan of Tolkien’s “The Lord of the Rings,” you know that Aragorn was described by the words “Not all who wander are lost.”  Now, while that’s perfectly fine for a ranger and the future king of Gondor, it’s not fine for IT departments as they move their communications systems to SIP.  […]

A traceSM look at SIP PRACK Messages

As many of my blog readers know, every few months I teach a two and a half day class “on all things SIP.” My students are exposed to everything from “why SIP” to the nitty-gritty of SIP requests, responses, and call flows. I even speak about some of the more esoteric topics such as To […]

Nine Good Reasons to Own a Session Border Controller

SIP has been around since the late 1990’s, but confusion still exists about what it exactly is and what it can do. Most telephony people understand that SIP changes the way we make voice and video calls, but their understanding is often sketchy. The confusion surrounding SIP is often greatest when it comes to the […]

SIP Security at Converge2015

When you think about security in terms of SIP and VoIP, you need to consider four different areas.  First, you want to protect the SIP signaling.  Second, you need to protect the media stream.  Third, you need to ensure that people are who they say they are.  Lastly, you need to create a secure network […]

Andrew Speaks at Converge2015

Every year I speak at the International Avaya User’s Group Converge conference. Next week, Converge2015 is being held in Denver, Colorado and I am presenting seven (yes, seven) breakout sessions.   I work hard researching my topics and enjoy meeting fellow Avaya users while helping spread the good word about Avaya’s products and technologies. If you […]

Closer Than We Think

From 1958 to 1963, Arthur Radebaugh wrote and illustrated a syndicated Sunday comic entitled, Closer Than We Think. Every week he stretched peoples’ imaginations with colorful visions of an amazing future filled with flying cars, floating houses, household robots ready to do our bidding, and jet-pack wearing letter carriers. I had a heap of fun […]