Clarifications for When to Use the name-addr Production in SIP Messages (RFC8217)
Original Publication Date: 2017-Aug-01
Included in the Prior Art Database: 2017-Aug-03
Internet Society Requests For Comment (RFCs)
[RFC3261] defines several header fields that contain URIs to allow both a form that contains the bare URI (addr-spec) and one that provides a name and the URI (name-addr). This subset, taken from the ABNF [RFC5234] specified in [RFC3261], shows the relevant part of the definition of the syntax of the "From" header field:
Internet Engineering Task Force (IETF) R. Sparks Request for Comments: 8217 Oracle Updates: 3261, 3325, 3515, 3892, 4508, August 2017 5002, 5318, 5360, 5502 Category: Standards Track ISSN: 2070-1721
Clarifications for When to Use the name-addr Production in SIP Messages
RFC 3261 constrained several SIP header fields whose grammar contains the "name-addr / addr-spec" alternative to use name-addr when certain characters appear. Unfortunately, it expressed the constraints with prose copied into each header field definition, and at least one header field was missed. Further, the constraint has not been copied into documents defining extension headers whose grammar contains the alternative.
This document updates RFC 3261 to state the constraint generically and clarifies that the constraint applies to all SIP header fields where there is a choice between using name-addr or addr-spec. It also updates the RFCs that define extension SIP header fields using the alternative to clarify that the constraint applies (RFCs 3325, 3515, 3892, 4508, 5002, 5318, 5360, and 5502).
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Further information on Internet Standards is available in Section 2 of RFC 7841.
Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at http://www.rfc-editor.org/info/rfc8217.
Sparks Standards Track [Page 1]
RFC 8217 name-addr Clarifications August 2017
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . ....