RFC 3262, "Reliability of Provisional Responses in Session Initiation Protocol (SIP)", June 2002

Errata ID: 4600
Status: Verified
Type: Technical
Publication Format(s) : TEXT
Reported By: Christer Holmberg
Date Reported: 2016-01-25
Verifier Name: Ben Campbell
Date Verified: 2016-01-25

Section 3 says:

The provisional response to be sent reliably is constructed by the
UAS core according to the procedures of Section 8.2.6 of RFC 3261.
In addition, it MUST contain a Require header field containing the
option tag 100rel, and MUST include an RSeq header field.  The value
of the header field for the first reliable provisional response in a
transaction MUST be between 1 and 2**31 - 1.  It is RECOMMENDED that
it be chosen uniformly in this range.  The RSeq numbering space is
within a single transaction.  This means that provisional responses
for different requests MAY use the same values for the RSeq number.

It should say:

The provisional response to be sent reliably is constructed by the
UAS core according to the procedures of Section 8.2.6 of RFC 3261.
In addition, it MUST contain a Require header field containing the
option tag 100rel, and MUST include an RSeq header field.  The
value of the header field for the first reliable provisional 
response in a transaction MUST be between 1 and 2**31 - 1.  It is
RECOMMENDED that it be chosen uniformly in this range. The RSeq 
numbering space is within a single transaction. This means that
the RSeq value of a provisional response within a fork of a request
is independent of the RSeq value of a provisional response within 
any other fork of that request, or for the responses for any other
request. It thus may be higher, lower, or the same as any other such
RSeq value.

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