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Locating Session Initiation Protocol (SIP) Servers in a Dual-Stack IP Network (RFC7984) Disclosure Number: IPCOM000247726D
Original Publication Date: 2016-Sep-01
Included in the Prior Art Database: 2016-Sep-30
Document File: 20 page(s) / 21K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

O. Johansson: AUTHOR [+5]


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.

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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


   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

 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    ( in effect on the date of    publication of this document.  Please review th...