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

Errata ID: 4602
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 4 says:

Assuming the response is to be transmitted reliably, the UAC MUST
create a new request with method PRACK.  This request is sent within
the dialog associated with the provisional response (indeed, the
provisional response may have created the dialog).  PRACK requests
MAY contain bodies, which are interpreted according to their type and
disposition.

It should say:

Assuming the response was transmitted reliably by the UAS, the UAC
MUST create a new request with method PRACK.  This request is sent
within the dialog associated with the provisional response (indeed,
the provisional response may have created the dialog). PRACK 
requests MAY contain bodies, which are interpreted according to
their type and disposition.

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