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2.2.2 Requests

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A request MUST use the request root element. The request element and all child elements MUST belong to the namespace "urn:ietf:params:xml:ns:cccp" unless specified as belonging to an extension namespace. All attributes MUST belong to no namespace unless specified as belonging to the extension namespace. Elements and attributes belonging to the extension namespace MUST belong to the namespace "http://schemas.microsoft.com/rtc/2005/08/confinfoextensions".

The request element MUST contain the following attributes:

  • requestId: MUST be set by the message sender to a non-negative integer that is unique among all requests from that sender.

  • from: Specifies the source of the request and MUST be the same value as the organizer URI.

  • to: Specifies the target of the request and MUST be the same value as the SIP URI contained in the To header of the enclosing SIP request.

The request element can contain the following attribute:

  • C3PVersion: MUST be set to "1".

The request element MUST contain exactly one child element. The child element identifies the type of request. The different types of requests are subsequently defined.