Last week, Paul Jones explained on VoIP Survivor the basic concepts behind AMS. The name might ring a bell to those familiar with IMS, but there is no real connection (besides the unfortunate use of a similar acronym). While IMS is an ongoing work, AMS is just beginning. There are many people out there engaged today in one way or another with IMS. They come from different companies and participate in various organizations
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By Tsahi Levent-Levi | June 5th, 2008 | Filed under Standardization
[The IP based services such as VoIP (with or without IMS) run over open IP networks. As such, they are susceptible to security threats similar to those in the Internet. As VoIP communications becomes widely used, the security level on it becomes essential. In this guest post, Rasa Siegberg a Senior Systems Engineer from SafeNet provides his insights to VoIP and security.] The Great IP Migration The venerable voice communications industry is undergoing one of the most significant evolutionary steps
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By guest | May 8th, 2008 | Filed under Technology
There are times when de-facto standards hinder the adoption and use of services. This is the case with 3G-324M and video ring-back servers. What’s 3G-324M? 3G video telephony uses a protocol called 3G-324M. This protocol in turn, uses another protocol called H.245 for call control - with H.245, handsets signal what features and capabilities they have and negotiate the media channels that will be used in the call. H.245 includes procedures and message that allow for the opening and closing
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By Tsahi Levent-Levi | April 24th, 2008 | Filed under Standardization
I read a while ago an opinion stating that there is no need anymore for standards - people choose their proprietary way of communication by installing a given application on their desktop or mobile device - be it Skype or one of the other services out there. I disagree with this view. Proprietary solutions definitely have room in our world. If you take telecommunication, the first thing that comes to mind is Skype. They are based on a proprietary protocol,
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By Tsahi Levent-Levi | February 7th, 2008 | Filed under Standardization
[Anatoli Levine is a RADVISION Senior Director of Software Support. Anatoli has over 15 years of experience in engineering and customer management, software design and development, network programming, telecommunications systems, security and computer graphics systems research. He can be reached at alevine@radvision.com.] It’s the beginning of 2008 and of course, people love to make predictions for the year ahead (if anything to guarantee a good laughter after all). Yours truly is not an exception - this post was thought to
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By guest | January 29th, 2008 | Filed under Technology
This is the second part of Interoperability in SIP and its relation to Art. You can read the first part here. SIP Interoperability workshop There were about 20 short but essential presentations at the 90 minutes workshop by the people representing different companies and organizations (yours truly represented IMTC and RADVISION). Overall message was rather unified. It is not all doom and gloom - there is basic interoperability in SIP. But all interoperability is extremely clustered - implementations usually work
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By guest | January 22nd, 2008 | Filed under Interoperability
The way in which communication standards are implemented is usually done through protocol stacks. Companies will usually acquire such stacks from third parties and not implement and maintain on their own. How does one select a protocol stack? What makes a protocol stack of one vendor better than that of another? 1. Support Support is definitely the most important aspect of a protocol stack. VoIP products are complex - developers building such products will need all the help they can
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By Tsahi Levent-Levi | January 17th, 2008 | Filed under Protocol stacks
SIP today is a standard-de-facto, “The Protocol” which runs our multimedia communication. I believe nobody would argue with this statement. All the vendors have their SIP based equipment in the field, so considering the level of maturity of the protocol (about 10+ years old) and more than 20 SipIt events -(SIPit IOT events) as well as numerous IOT events by other consortia and standard bodies, we can expect that majority of devices on the market are highly interoperable.
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By guest | January 15th, 2008 | Filed under Interoperability
We all had that joyful moment of downloading another application from the web. Some of us (well, probably a lot of us) are using Skype - a downloadable client for desktops. But what about mobile handsets? Can we have a downloadable client that truly works on a handset? In the past year, I’ve answered RFIs and RFQs of operators and handset vendors who were seeking to develop a VoIP client. The customers asked for a client that should support
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By Tsahi Levent-Levi | January 3rd, 2008 | Filed under Clients
