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Web RTC (Web Real Time Communication) is a new web standard currently supported by Google, Mozilla and Opera.
You can deploy one or more Persistent Chat Server pools, each with up to four active Persistent Chat Servers supporting up to 80K concurrent users.
Skype for Business Server 2015 communicates with the Persistent Chat service using the Session Initiation Protocol (SIP) for registration and the Extensible Chat Communication Over SIP protocol (XCCOS) for chat.
The service stores files that are uploaded into chat rooms in the Persistent Chat file store.
If your organization has regulations that require Persistent Chat activity to be archived, you can deploy the optional Persistent Chat Compliance service.
The back-end components include the Persistent Chat store and the Persistent Chat compliance store.
The Persistent Chat service stores and accesses chat room content and other system metadata (authorization rules and so on) by using the Persistent Chat store.
Although users can communicate in real time during a chat session, the content of each session--including text, links, and files--is persistent, which means users can view and search all content of the session at any time.