pidgin-sipe

A third-party plugin for the Pidgin multi-protocol instant
messenger. It implements the extended version of SIP/SIMPLE used by
various products:

Skype for Business.
Microsoft Office 365.
Microsoft Business Productivity Online Suite (BPOS).
Microsoft Lync Server.
Microsoft Office Communications Server (OCS 2007/2007 R2).
Microsoft Live Communications Server (LCS 2003/2005).
Reuters Messaging.

With this plugin you should be able to replace your
Skype for Business client with Pidgin.

          

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License: GPL-2.0-or-later
URL: https://sipe.sourceforge.io/