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3.1.5.12.1 Restriction to Receiving an SDP Answer in Provisional Response

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To support early media, all of the following conditions MUST be met when a user agent receives an SDP answer in the provisional response.

  • ICE MUST be supported for early media.

  • All SDP answers in the provisional responses MUST be the same.

  • When the offer is forked, SDP answers not in reliable provisional responses, as specified in section 3.1.5.13, SHOULD<14> be sent by a maximum of one device. For information about how to determine if an offer is forked, see [MS-SIPRE].