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
|
|
---|---|---|---|
Authors | Olle Johansson , Gonzalo Salgueiro , Vijay Gurbani , Dale Worley | ||
Last updated | 2016-09-29 | ||
Replaces | draft-johansson-sip-dual-stack | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
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 IANA Actions |
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 Eyeballs to SIP. Happy Eyeballs will provide enhanced performance, and consequently enhanced user experience, in highly hybridized dual- stack SIP networks. The procedures described herein are such that aShow full document text