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Yeah like:

> Skype for Business Expiring in over 3 years, Skype for Business (formerly Microsoft Lync and Office Communicator) was an enterprise instant messaging software developed by Microsoft as part of the Microsoft Office suite. It was almost 18 years old.

It’s still around because of a lengthy transition path Microsoft offers and they admit that and then start talking about it in the past tense…

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It's kinda sad that they're killing SfB.

Behind the scenes, it uses SIP and SDP for establishing calls - back in the day at $BigCo, we were developing a software suite for debugging SIP infrastructure, and Skype for Business was surprisingly easy to integrate. Shame that Teams switched to a proprietary Microsoft protocol now.

Trouter (Microsoft Teams routing software for video calls and voice calls) crashes and fails to parse SDPs every day, even from Teams clients. I swear it is the least reliable session border controller we interact with, every 2 weeks a new software version is rolled out and new things break while tickets about bugs we filed with Microsoft continue to go ignored.

Parts are older still. The group chat in later versions of Skype for Business originated at UBS in the nineties by way of Mindalign.

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