Locating Session Initiation Protocol (SIP) Servers in a Dual-Stack IP Network
RFC 7984

Document Type RFC - Proposed Standard (September 2016; No errata)
Updates RFC 3263
Last updated 2016-09-29
Replaces draft-johansson-sip-dual-stack
Stream IETF
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Reviews
Stream WG state Submitted to IESG for Publication
Document shepherd Adam Roach
Shepherd write-up Show (last changed 2016-06-02)
IESG IESG state RFC 7984 (Proposed Standard)
Consensus Boilerplate Yes
Telechat date
Responsible AD Ben Campbell
Send notices to "Adam Roach" <adam@nostrum.com>
IANA IANA review state Version Changed - Review Needed
IANA action state No IC
Internet Engineering Task Force (IETF)                      O. Johansson
Request for Comments: 7984                                     Edvina AB
Updates: 3263                                               G. Salgueiro
Category: Standards Track                                  Cisco Systems
ISSN: 2070-1721                                               V. Gurbani
                                               Bell Labs, Nokia Networks
                                                          D. Worley, Ed.
                                                                 Ariadne
                                                          September 2016

           Locating Session Initiation Protocol (SIP) Servers
                       in a Dual-Stack IP Network

Abstract

   RFC 3263 defines how a Session Initiation Protocol (SIP)
   implementation, given a SIP Uniform Resource Identifier (URI), should
   locate the next-hop SIP server using Domain Name System (DNS)
   procedures.  As SIP networks increasingly transition from IPv4-only
   to dual-stack, a quality user experience must be ensured for dual-
   stack SIP implementations.  This document updates the DNS procedures
   described in RFC 3263 for dual-stack SIP implementations in
   preparation for forthcoming specifications for applying "Happy
   Eyeballs" principles to SIP.

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/rfc7984.

Johansson, et al.            Standards Track                    [Page 1]
RFC 7984            Locating SIP Servers in IPv4/IPv6     September 2016

Copyright Notice

   Copyright (c) 2016 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  DNS Procedures in a Dual-Stack Network  . . . . . . . . . . .   4
     3.1.  Dual-Stack SIP UA DNS Record Lookup Procedure . . . . . .   4
     3.2.  Indicating Address Family Preference in DNS SRV Records .   5
   4.  Clarification of Interaction with RFC 6724  . . . . . . . . .   6
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   8
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   The Session Initiation Protocol (SIP) [RFC3261] and the additional
   documents that extended it provide support for both IPv4 and IPv6.
   However, this support does not fully extend to the highly hybridized
   environments that are characteristic of the transitional migratory
   phase from IPv4 to IPv6 networks.  During this phase, many server and
   client implementations run on dual-stack hosts.  In such
   environments, a dual-stack host will likely suffer greater connection
   delay, and by extension an inferior user experience, than an
   IPv4-only host.  The need to remedy this diminished performance of
   dual-stack hosts led to the development of the "Happy Eyeballs"
   [RFC6555] algorithm, which has since been implemented in many
   protocols and applications.

Johansson, et al.            Standards Track                    [Page 2]
RFC 7984            Locating SIP Servers in IPv4/IPv6     September 2016

   This document updates the DNS lookup procedures of RFC 3263 [RFC3263]
   in preparation for the specification of the application of Happy
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