Session Description Protocol (SDP) Offer/Answer Procedures for Stream Control Transmission Protocol (SCTP) over Datagram Transport Layer Security (DTLS) Transport
RFC 8841
| Document | Type | RFC - Proposed Standard (January 2021; No errata) | |
|---|---|---|---|
| Authors | Christer Holmberg , Roman Shpount , Salvatore Loreto , Gonzalo Camarillo | ||
| Last updated | 2021-01-18 | ||
| Replaces | draft-loreto-mmusic-sctp-sdp | ||
| Stream | IETF | ||
| Formats | plain text html xml pdf htmlized bibtex | ||
| Reviews | |||
| Stream | WG state | Submitted to IESG for Publication | |
| Document shepherd | Flemming Andreasen | ||
| Shepherd write-up | Show (last changed 2017-01-12) | ||
| IESG | IESG state | RFC 8841 (Proposed Standard) | |
| Action Holders |
(None)
|
||
| Consensus Boilerplate | Yes | ||
| Telechat date | |||
| Responsible AD | Ben Campbell | ||
| Send notices to | (None) | ||
| IANA | IANA review state | Version Changed - Review Needed | |
| IANA action state | RFC-Ed-Ack | ||
Internet Engineering Task Force (IETF) C. Holmberg
Request for Comments: 8841 Ericsson
Category: Standards Track R. Shpount
ISSN: 2070-1721 TurboBridge
S. Loreto
G. Camarillo
Ericsson
January 2021
Session Description Protocol (SDP) Offer/Answer Procedures for Stream
Control Transmission Protocol (SCTP) over Datagram Transport Layer
Security (DTLS) Transport
Abstract
The Stream Control Transmission Protocol (SCTP) is a transport
protocol used to establish associations between two endpoints. RFC
8261 specifies how SCTP can be used on top of the Datagram Transport
Layer Security (DTLS) protocol, which is referred to as SCTP-over-
DTLS.
This specification defines the following new Session Description
Protocol (SDP) protocol identifiers (proto values): "UDP/DTLS/SCTP"
and "TCP/DTLS/SCTP". This specification also specifies how to use
the new proto values with the SDP offer/answer mechanism for
negotiating SCTP-over-DTLS associations.
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
https://www.rfc-editor.org/info/rfc8841.
Copyright Notice
Copyright (c) 2021 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
(https://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. Conventions
3. SCTP Terminology
4. SDP Media Descriptions
4.1. General
4.2. Protocol Identifiers
4.3. Media-Format Management
4.4. Syntax
4.4.1. General
4.4.2. SDP Media Description Values
4.5. Example
5. SDP "sctp-port" Attribute
5.1. General
5.2. Syntax
5.3. Mux Category
6. SDP "max-message-size" Attribute
6.1. General
6.2. Syntax
6.3. Mux Category
7. UDP/DTLS/SCTP Transport Realization
8. TCP/DTLS/SCTP Transport Realization
9. Association and Connection Management
9.1. General
9.2. SDP "sendrecv"/"sendonly"/"recvonly"/"inactive" Attributes
9.3. SCTP Association
9.4. DTLS Association (UDP/DTLS/SCTP and TCP/DTLS/SCTP)
9.5. TCP Connection (TCP/DTLS/SCTP)
10. SDP Offer/Answer Procedures
10.1. General
10.2. Generating the Initial SDP Offer
10.3. Generating the SDP Answer
10.4. Offerer Processing of the SDP Answer
10.5. Modifying the Session
11. Multihoming Considerations
12. NAT Considerations
12.1. General
12.2. ICE Considerations
13. Examples
13.1. Establishment of UDP/DTLS/SCTP Association
14. Security Considerations
15. IANA Considerations
15.1. New SDP Proto Values
15.2. New SDP Attributes
15.2.1. sctp-port
15.2.2. max-message-size
15.3. association-usage Name Registry
16. References
16.1. Normative References
16.2. Informative References
Acknowledgements
Authors' Addresses
1. Introduction
The Session Description Protocol (SDP) [RFC4566] provides a general-
purpose format for describing multimedia sessions in announcements or
invitations. "TCP-Based Media Transport in the Session Description
Protocol (SDP)" [RFC4145] specifies a general mechanism for
describing and establishing TCP [RFC0793] streams. "Connection-
Oriented Media Transport over the Transport Layer Security (TLS)
Protocol in the Session Description Protocol (SDP)" [RFC8122] extends
[RFC4145] to describe TCP-based media streams that are protected
using TLS.
The Stream Control Transmission Protocol (SCTP) [RFC4960] is a
reliable transport protocol used to transport data between two
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