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
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
Since Skype has an open client-side API, why not use it as a transport to tunnel VPN traffic and blow through firewalls to connect you to a remote system? That's the idea raised by Peeter P. Mõtsküla in his Skype Developer Blog entry: "Idea: skypetunnel". For instance, have a Skype client running on your home machine logged in as one account. Have Skype on your laptop on another account. Initiate a connection between the two of them and wind up with secure, encrypted access through the firewall from wherever you are. Being peer-to-peer, there would be no central servers or infrastructure required (outside the usual Skype p2p cloud.) This would require, of course, a yet-to-be-created "extra" that connected into the Skype client API and was installed on both systems...but that was the point of the article... 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
With my post earlier this month about the possibility of SIP botnets [also featured here on CircleID], I've had a number of people asking about more information and wondering about the possible impacts. And while I will write more on botnets in general, as far as the potential impact of "botnets" in general, one need only look over at the current situation in Estonia... Now, perhaps Russia is behind the attack... perhaps not. There are obviously much larger political issues going on between the two states. more
A story... ZZZ Telemarketing (not a real name) is locked in a heated fight with their bitter rival, YYY Telemarketing (also not a real name), to win a very large lead generation contract with Customer X. Customer X has decided to run a test pitting the two companies against each other for a week to see who can generate the most leads. The ZZZ CEO has said to his staff that it is "do or die" for the company. If they fail to win the contract, they will have to shut down -- they need to do "whatever it takes" to win over YYY. A ZZZ staffer discovers that part of why YYY has consistently underbid them is because they are using SIP trunks to reduce their PSTN connection costs. But the staffer also discovers that YYY is using very cheap voice service providers who run over the public Internet with no security... more
After much initial fanfare a couple of years ago ENUM has matured to a state where it is currently yet another under-achiever in the technology deployment stakes. ENUM initially presented itself as a very provocative response to the legacy telco position of monopolising public voice services through their exclusive control over the Public Switched Telephone Network (PSTN) and the associated controlling position over the telephone number space... The perception was that ENUM was going to dismantle these levers of control and open up the voice market to a new wave of competitive carriers. If the address plan was the key to the PSTN, then ENUM was intended unlock this network and position the new wave of Voice Over IP (VOIP) carriers to take over any residual treasures of the traditional voice market. Events have not played out according to these expectations... more
A new article by Ken Camp, published at Realtime VoIP, discusses telephony regulations, describing some existing regulatory issues surrounding telecommunications and how they might impact VoIP services. The following is an introduction to this article: "Bringing new technologies such as VoIP into service presents a wide range of technical challenges. Given the highly regulated environment of telecommunications, VoIP presents a set of regulatory challenges. For the most part, these challenges present hurdles to VoIP service providers who want to deliver commercial services to consumers and businesses and don't directly impact business VoIP deployment. ...Businesses that embrace managed VoIP services might want to review some of these regulatory issues, such as E-911 services, with the managed VoIP service provider." more
I like the drift of the Pulver/Evslin proposal on emergency communications, and wish there was as vigorous a debate going on over here. I just hope we in the UK aren't jerked out of complacency by some major disaster -- although widespread use of pre-paid cellular means the problem of sunken landlines isn't as acute. Yet I can't help but wonder why the poor public has to wait for a disaster before they're given partial control over how their number maps to different destinations and services. Why can't I get a voicemail service from someone other than my connectivity provider? Why is ENUM hostage to the telcos, whose interest lies in ensuring that new services can only come from them? more
Recently, FCC placed on public review a petition filed by Evslin Consulting and pulver.com. The petition grew out of the experiences felt during a breakdown in communications network caused by Hurricane Katrina. As you may recall, whole communities were evacuated in the Gulf coast and many families were separated because they ended in different cities. Added to the trauma, many of these evacuees found it difficult to contact and communicate with each other. But those who have VoIP service and those who subscribe to premium features on their PSTN lines were better off because their services were able to forward the calls to the new location... more
A couple of new notes that underscore the continued convergence of real-time communications services (e.g. voice/video/IM) into a presence-based real-time IP communications infrastructure... I haven't seen this shift just yet, but increasingly the folks responsible for managing voice and video systems are integrating their planning with the groups in charge of instant messaging and collaboration. I expect this trend to accelerate as we move forward. more
VoIP is here to stay. In fact many incumbent telecommunication carriers have started offering VoIP service for sometime and several new VoIP service providers have emerged. Aside from issues such as quality of service, the aspect of security, or lack thereof, is misunderstood by some of the VoIP service providers. This purpose of this article is to discuss two of the most well known attacks that can be carried out in current VoIP deployments. more
Many communications networks are constructed for a single form of communication, and are ill suited to being used for any other form. Although the Internet is also a specialized network in terms of supporting digital communications, its relatively unique flexibility lies in its ability to digitally encode a very diverse set of communications formats, and then support their interaction over the Internet. In this way many communications networks can be mapped into an Internet application and in so doing become just another distributed application overlayed on the Internet. From this admittedly Internet-centric perspective, voice is just another Internet application. And for the growing population of Voice over IP (VoIP) users, this is indeed the case... more
My presentation at VON was focused on availability (aka presence) and contextually-aware communications, but I did begin with a brief mention of subjects I'm passionate about and I ended with my typical closing comments about telecommunications... Apparently this struck a chord with several people who came up to me afterwards asking about how they could help the spread of telecom to developing countries and did I have references for my statements about telecom is good for mankind? more
Over the last ten years, Andrew Odlyzko has been writing about a pricing algorithm that would assure reasonable service levels at reasonable prices. If you're going to F2C, you might want to read that brief article or this slightly more complex one to learn (or refresh your sense of) PMP -- Paris Metro Pricing models to deal with network congestion. You'll also get a sense of why throwing bandwidth at the network will not be sufficient. Here's a great article from 1995... more
A World-Renowned Source for Internet Developments. Serving Since 2002.