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3.15.5.1 Processing INVITE

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When an incoming INVITE is received that contains multi-part MIME structures described in section 3.15.4.1, the user agent MUST pick SDP ICEv19 as the offer if the UAS supports [IETFDRAFT-ICENAT-19], as specified in [MS-SDPEXT].

Alternatively, if the UAS does not support [IETFDRAFT-ICENAT-19], as specified in [MS-SDPEXT], but supports [IETFDRAFT-ICENAT-06], as specified in [MS-SDPEXT], the user agent MUST pick SDP ICEv6 as the offer.<74>

If the incoming INVITE does not contain any Interactive Connectivity Establishment(ICE), it will have only one SDP as specified in [RFC3261]