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What is RSeq Header Field?

RSeq header field is used in provisional (1xx class) responses to INVITEs to request dependable transport.

The header field may be used only if the INVITE request enclosed the Supported: rel100 header field.

1. If present in a provisional response, the UAC should accept receipt of the response with a PRACK method.

2. RSeq header field holds a dependable sequence number that is an integer randomly initialized by the UAS.

3. Every subsequent provisional response sent reliably for this dialog will have a consistently increasing RSeq number.

4. The UAS will retransmit a dependably sent response until a PRACK is received with a RAck having the reliable sequence number and CSeq.

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