Integrating Skype Calls into Streaming Software
Any NDI enabled hardware or software such as OBS and Tricaster can now receive incoming Skype calls where each individual can be a source.
https://www.skype.com/en/content-creators/
https://support.skype.com/en/faq/FA34853/what-is-skype-for-content-creators
Newtek Tricaster: