PRACK is used to admit the receipt of a reliable transfer of provisional response (1XX).
1. PRACK is generated and returned by a client when a provisional response has been received containing an RSeq reliable sequence number and a supported: 100rel header.
2. PRACK carries (RSeq + CSeq) value in the rack header.
3. A PRACK may have a message body; it may be used for offer or answer exchange
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