OCS is based on the Session Initiation Protocol (SIP) standard, which is defined in the Internet Engineering Task Force (IETF) Request for Comment (RFC) 3261. Some features are available via a web browser with using Communicator Web Access.Some features are available to users with standard phone lines or mobile phones via the Public Switched Telephone Network (PSTN).To external users who have been invited by corporate users. ![]()
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