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What is PRACK Request Extension Method in SIP?

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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