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This section specifies application sharing media specific SDP content rules for SIP INVITE messages associated with an addUser dial-in. In addition to the rules specified in [MS-CONFBAS] section 3.11 for outgoing SIP INVITE requests, the following rules apply to SIP INVITE messages that follow addUser dial-in requests sent to the ASMCU.
It is assumed that protocol clients have subscribed to conference notifications and have followed all of the rules and recommendations specified in [MS-CONFBAS]. Therefore, the protocol client is aware of the following information before constructing the SIP INVITE message and the SDP offer content contained within it.
The MCU-Conference-URI of the ASMCU that is extracted from the conf-uris element of the Conference Document, whose child purpose element contains the value "applicationsharing", as specified in [MS-CONFBAS] section 2.2.2.4.