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RFC 5589, "Session Initiation Protocol (SIP) Call Control - Transfer", June 2009

Source of RFC: IETF - NON WORKING GROUP
Area Assignment: rai

Errata ID: 3273
Status: Held for Document Update
Type: Technical
Publication Format(s) : TEXT

Reported By: Victor S. Osipov
Date Reported: 2012-06-29
Held for Document Update by: Robert Sparks

Section 5 says:

3. There were concerns with authorizing out-of-dialog REFERs. The
authorization policy for REFER in most implementations piggybacks
on the authorization policy for INVITE (which is, in most cases,
based simply on "I placed or answered this call").

Globally Routable UA URIs (GRUUs) [SIP-GRUU] can be used to address
problem 1. Problem 2 can be addressed using the Target-Dialog header
field defined in [RFC4538]. In the immediate term, this solution to
problem 2 allows the existing REFER authorization policy to be
reused.

It should say:

3. There were concerns with authorizing out-of-dialog REFERs. The
authorization policy for REFER in most implementations piggybacks
on the authorization policy for INVITE (which is, in most cases,
based simply on "I placed or answered this call").

Globally Routable UA URIs (GRUUs) [SIP-GRUU] can be used to address
problem 1. Problem 2 can be addressed using the Target-Dialog header
field defined in [RFC4538]. In the immediate term, this solution to
problem 2 allows the existing INVITE authorization policy to be
reused by REFER (thus solving problem 3).

Notes:

The phrase 'allows the existing REFER authorization policy to be reused' leads to a misunderstanding and confusion, because in actual fact INVITE authorization policy may be reused by REFER, not inversely.
The correction is proposed in order to clear up confusion.

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