For many in the Voice over IP world, Session Initiation Protocol (SIP) is the holy grail. Once it is accepted by every vendor and manufacturer, it will enable every IP-based device and application to communicate with one another. But for now it remains still a bit of an enigma that raises a large number of questions for everyone. TechTarget offers a VoIP SIP fundamentals guide discussing some of the basics of SIP -- its vulnerabilities, testing and hardware. more
While most people I know are at either VoiceCon or CTIA this week, this one is worth staying home for. Also, I'm sure all the Skype followers are focused today on the news about working with the iPhone -- and that IS a big story. However -- for very different reasons -- I'm sure you'll find this one of interest too. This was a front page story in today's Globe and Mail, and no doubt many other Canadian dailies... more
I ought to explain why I've suddenly gone cold on VoIP. It's just I've watched my own behaviour. I've grown tired of the inconsistency of PC VoIP calls, and instead I've reverted to using landlines, mobiles and Jajah (for callback). But I'm still using IM to set up many of those calls! The problem isn't unique to any one client - they're all proving unsuitable for business use with clients (which is most of my telephony needs covered). The worst of all seems to be Skype conference calling... more
The internet is a shared resource. Different access providers begin mixing traffic at different places, but sooner or later, my internet gets mixed into yours. The Canadian Association of Internet Providers (CAIP) application to the Canadian Radio-television and
Telecommunications Commission (CRTC) seems to acknowledge this shared nature with its reference (at paragraph 50 of its application) to the description of the Gateway Access Service its members resell, a description complete with a graphic of a cloud -- a sign that the resource is being shared... more
VoIP has been banned across most of Africa for a long time, feared by the state-owned telcos as a way for alternative service providers to bypass them with international calls, eroding a very lucrative part of their business. At profit margins of several thousand percent in some cases, it is not surprising that unlicensed operators have sprung up all over the continent, risking huge fines, confiscation of their equipment and even jail terms. more
Vonage's latest woes are written up by Om Malik in Vonage: How Low Can You Go. More interesting than Om's reportage (Sprint wins case, Vonage ordered to pay damages, stock drops to $1.30) is the commentary afterward, in which one reader takes Om to task for the "gleeful" way in which he reports the demise of the VoIP companies... Boosters made the argument that VoIP was fundamentally cheaper than the TDM systems that phone companies deploy, and so therefore they enjoyed a price advantage in the market place. Anyone in the business of supplying telecom equipment, however, will tell you that the argument is flawed... more
Ok, ok - it's pretty hard to ignore the bombshell news that's on front pages everywhere today in Canada. It looks like Nortel is going to seek bankruptcy protection, perhaps as early as today. This may be a minor story in the U.S. business press, but it's a big story in tech/telecom, and a HUGE story here in Canada. You don't need me to tell you what Nortel means to Canada in terms of pride and joy, although that's more of a distant memory these days... more
It's been a busy month for the folks in the Skype For SIP project. First, back on September 9, Skype announced ShoreTel interoperability. Then last week on September 17, Skype announced interop with the open source SIPFoundry sipXecs product. Today, though, is Skype's biggest announcement yet... more
Spam over Internet Telephony (SPIT) is viewed by many as a daunting threat. SPIT is much more fatal than email spam, for the annoyance and disturbance factor is much higher. Various academic groups and the industry have made some efforts to find ways to mitigate SPIT. Most ideas in that field are leaning on classical IT security concepts such as intrusion detection systems, black-/white-/greylists, Turing tests/computational puzzles, reputation systems, gatekeeper solutions, etc... We identified the lack of a benchmark testbed for SPIT as a serious gap in the current research on the matter, and this motivated us at the to start working on a first tool for that. more
The US Federal Communications Commission (FCC) recently issued a public notice that it will be holding two workshops on the transition of the public switched telephone network (PSTN) to "new technologies" such as voice-over-IP (VoIP). The workshops will be held on December 6 and 14, 2011, at the FCC's office in Washington, DC. The public notice states the goal as... more
In this article, published in the Federal Communications Law Journal (FCLJ), the authors (Reed E. Hundt and Gregory L. Rosston) have proposed sweeping changes to the current telecommunications regulatory regime. With impending reform in telecommunications laws, the authors argue that an important first step is the creation of a bipartisan, independent commission to examine and recommend implementation of more market-oriented communications policy. The following excerpt from the article looks into service competition with respect to VoIP... more
I co-authored a book in 2005, titled "Extreme Exploits: Advanced Defenses Against Hardcore Hacks." My chapters focused on securing routing protocols such as BGP, and securing systems related to DMZs, firewalls, and network connectivity. As I look back over those chapters, I realize that the basic fundamentals of network security really haven't changed much even though technology has advanced at an incredible pace. "Defense in depth" was a hot catch phrase seven years ago, and it still applies today. more
Our world finds itself at a critical juncture. Both trillions of dollars and the future of human communications including fundamental access to it are at stake. For telecom operators and media outlets there is not a migratory way from where we are to the future. There is a clear consumer shift underway that runs in the opposite direction to that of telecom and media incumbents; emergent social practice is increasingly clashing with the very structure and desires of incumbent players... It was for these reasons that one of the six keynote speakers invited to Spring 2009 Emerging Communications Conference (eComm) in San Francisco was Richard Whitt, Google's Washington Telecom and Media Counsel. His keynote was entitled, Tinkering without Tampering: Wrestling with Convergence and Communications Policy... more
I've been involved with VoIP technology since 1996. I've been a public advocate for wideband audio at least since 1997. And I've admired and supported a variety of companies using VoIP to provide innovative services and new user interfaces. But reflecting on the past decade, the only globally significant impact of VoIP has been on prices (by fostering arbitrage). Most VoIP telephony services are just digital POTS... more
Skype's official explanation. Phil Wolff has a good set of interpolated comments on the official explanation. There are two things to add... As the Register points out, last Tuesday was Microsoft's monthly patch day and those patches required a re-boot. If we believe Skype that their problem started with excessive login attempts, this is the only plausible explanation on the table... more
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