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3.2.4.1 Indicating Support for Presence Extensions

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Session Initiation Protocol Extensions defines a new header to indicate support for presence. The client SHOULD insert the following header in its REGISTER requests as part of the login sequence.

 Supported: com.microsoft.msrtc.presence

This header indicates to the server that the client understands the Session Initiation Protocol Extensions for presence, notably its support for the setPresence SOAP request and text/xml+msrtc.pidf presence document format (see section 2.2.1). The server assumes that a client that inserts this header in its first REGISTER request will subsequently send a setPresence request to set its presence state. Failure to do so will cause the server to show the client as offline after a short period of time. The exact interval SHOULD be a configurable parameter on the server and can be set to a suitable value between 3 minutes and 15 minutes.