I would suggest understanding the difference between a protocol and a program that implements a protocol. Unfortunately the modern trend is to blur these concepts, and have a singleton program implementing a protocol which is not explicitly named. Jitsi Meet (which I think you mean to refer to when you say Jitsi) is an example of this.
Linphone implements SIP. https://en.wikipedia.org/wiki/Session_Initiation_Protocol There are also implementations of SIP which can run within a web browser, using WebRTC. https://en.wikipedia.org/wiki/WebRTC
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