A Network Address Translator (NAT) Traversal Mechanism for Media Controlled by the Real-Time Streaming Protocol (RTSP)
RFC 7825
Internet Engineering Task Force (IETF) J. Goldberg
Request for Comments: 7825 Cisco
Category: Standards Track M. Westerlund
ISSN: 2070-1721 Ericsson
T. Zeng
Nextwave Wireless, Inc.
December 2016
A Network Address Translator (NAT) Traversal Mechanism for Media
Controlled by the Real-Time Streaming Protocol (RTSP)
Abstract
This document defines a solution for Network Address Translation
(NAT) traversal for datagram-based media streams set up and
controlled with the Real-Time Streaming Protocol version 2 (RTSP
2.0). It uses Interactive Connectivity Establishment (ICE) adapted
to use RTSP as a signaling channel, defining the necessary RTSP
extensions and procedures.
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/rfc7825.
Goldberg, et al. Standards Track [Page 1]
RFC 7825 A Media NAT Traversal Mechanism for RTSP December 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
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the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction ....................................................3
2. Key Words .......................................................4
3. Solution Overview ...............................................4
4. RTSP Extensions .................................................6
4.1. ICE Transport Lower Layer ..................................6
4.2. ICE Candidate Transport Header Parameter ...................8
4.3. ICE Password and Username Transport Header Parameters .....11
4.4. ICE Feature Tag ...........................................11
4.5. Status Codes ..............................................12
4.5.1. 150 Server still working on ICE
connectivity checks ................................12
4.5.2. 480 ICE Connectivity check failure .................12
4.6. New Reason for PLAY_NOTIFY ................................12
4.7. Server-Side SDP Attribute for ICE Support .................13
5. ICE-RTSP .......................................................13
5.1. ICE Features Not Required .................................13
5.1.1. ICE-Lite ...........................................13
5.1.2. ICE-Mismatch .......................................13
5.1.3. ICE Remote Candidate Transport Header Parameter ....14
5.2. High-Reachability Configuration ...........................14
6. Detailed Solution ..............................................14
6.1. Session Description and RTSP DESCRIBE (Optional) ..........14
6.2. Setting Up the Media Streams ..............................15
6.3. RTSP SETUP Request ........................................16
6.4. Gathering Candidates ......................................16
6.5. RTSP Server Response ......................................17
6.6. Server-to-Client ICE Connectivity Checks ..................18
6.7. Client-to-Server ICE Connectivity Check ...................19
6.8. Client Connectivity Checks Complete .......................20
6.9. Server Connectivity Checks Complete .......................20
6.10. Freeing Candidates .......................................20
Goldberg, et al. Standards Track [Page 2]
RFC 7825 A Media NAT Traversal Mechanism for RTSP December 2016
6.11. Steady State .............................................21
6.12. Re-SETUP .................................................21
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