You needed a device called an NTU to do that, and one could only install it after the installation of phone lines. Of course, getting the ISDN lines installed and bonded was a challenge in and of itself. (More details on the method can be read on Wikipedia.) These systems used a “least common denominator” method, so H.320 calls across brands “worked” but calls within one brand were superior. The standard was called H.320 and was created by the ITU-T around 1990. The first commercial video conferencing devices (Picture-Tel, Vtel, a few others) operated over ISDN lines. Thinking specifically about video interoperability, we asked David Danto, Director of UC Strategy and Research at Poly, to comment on the first instances of video interoperability he could recall.Īfter replying with “Wow-that’s an interesting question”, David has authored this section. No case is as obvious as video interoperability. And a long way from what is available today.įrom needing interoperability for products to function, we fast forward to today’s world where interoperability is merely a desirable. This, of course, is the most basic level of communications interoperability. We wouldn’t have the phone network or the internet if it wasn’t for interoperability.” If you look at telecommunications as a whole, it’s been foundational. Interoperability is an enabler of ecosystems and how important it is depends on the market landscape. The ecosystem shifted and now the client and the server are defined by the same people. Without standards, you can have greater innovation as you don’t need to go to a standards body to agree on a new feature. Over time, we started to see that diminish. For that ecosystem to work, you needed standards for every feature and function. One vendor made the phone, another made the software, and a third would buy those and sell the service behind them. “In the beginning, you couldn’t have products without interoperability. As SIP technology became recognized as a communications protocol, Jonathan was to have no idea of the significance of his work on future communications. Over 20 years ago, Jonathan Rosenberg, CTO and Head of AI at Five9 (previously held senior roles at Lucent Technologies, Cisco, and Microsoft) published the first core document for SIP, RFC 2543. How vendors are playing together nicelyġ – The first instances of interoperability in business communications.
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