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3.2.4.3 Establishing session as anonymous client

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The client MUST only establish anonymous sessions for joining conferences of the type specified in [MS-CONFBAS].<5>

When a client is required to establish a session with a remote entity that has a URI in the form of a conference GRUU, as specified in [MS-SIPRE], and the client does not have a registered endpoint, the client MUST establish the aforementioned session by creating a random anonymous URI and use that as the From: header of the sessions established. The client MUST use a URI of the form <username>@anonymous.invalid.