rfc8841v5.txt   rfc8841.txt 
Internet Engineering Task Force (IETF) C. Holmberg Internet Engineering Task Force (IETF) C. Holmberg
Request for Comments: 8841 Ericsson Request for Comments: 8841 Ericsson
Category: Standards Track R. Shpount Category: Standards Track R. Shpount
ISSN: 2070-1721 TurboBridge ISSN: 2070-1721 TurboBridge
S. Loreto S. Loreto
G. Camarillo G. Camarillo
Ericsson Ericsson
August 2020 January 2021
Session Description Protocol (SDP) Offer/Answer Procedures for Stream Session Description Protocol (SDP) Offer/Answer Procedures for Stream
Control Transmission Protocol (SCTP) over Datagram Transport Layer Control Transmission Protocol (SCTP) over Datagram Transport Layer
Security (DTLS) Transport Security (DTLS) Transport
Abstract Abstract
The Stream Control Transmission Protocol (SCTP) is a transport The Stream Control Transmission Protocol (SCTP) is a transport
protocol used to establish associations between two endpoints. RFC protocol used to establish associations between two endpoints. RFC
8261 specifies how SCTP can be used on top of the Datagram Transport 8261 specifies how SCTP can be used on top of the Datagram Transport
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received public review and has been approved for publication by the received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 7841. Internet Standards is available in Section 2 of RFC 7841.
Information about the current status of this document, any errata, Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at and how to provide feedback on it may be obtained at
https://www.rfc-editor.org/info/rfc8841. https://www.rfc-editor.org/info/rfc8841.
Copyright Notice Copyright Notice
Copyright (c) 2020 IETF Trust and the persons identified as the Copyright (c) 2021 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
(https://trustee.ietf.org/license-info) in effect on the date of (https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as the Trust Legal Provisions and are provided without warranty as
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description. description.
Appropriate values: Integer Appropriate values: Integer
Contact name: Christer Holmberg Contact name: Christer Holmberg
Contact e-mail: christer.holmberg@ericsson.com Contact e-mail: christer.holmberg@ericsson.com
Reference: RFC 8841 Reference: RFC 8841
Syntax: sctp-port-value = 1*5(DIGIT) ; DIGIT defined in RFC 4566 Syntax:
sctp-port-value = 1*5(DIGIT) ; DIGIT defined in RFC 4566
The SCTP port range is between 0 and 65535 (both included). Leading The SCTP port range is between 0 and 65535 (both included). Leading
zeroes MUST NOT be used. zeroes MUST NOT be used.
Example: Example:
a=sctp-port:5000 a=sctp-port:5000
5.3. Mux Category 5.3. Mux Category
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associated with the SDP media description. associated with the SDP media description.
Appropriate values: Integer Appropriate values: Integer
Contact name: Christer Holmberg Contact name: Christer Holmberg
Contact e-mail: christer.holmberg@ericsson.com Contact e-mail: christer.holmberg@ericsson.com
Reference: RFC 8841 Reference: RFC 8841
Syntax: max-message-size-value = 1*DIGIT ; DIGIT defined in RFC 4566 Syntax:
max-message-size-value = 1*DIGIT ; DIGIT defined in RFC 4566
Leading zeroes MUST NOT be used. Leading zeroes MUST NOT be used.
Example: Example:
a=max-message-size:100000 a=max-message-size:100000
6.3. Mux Category 6.3. Mux Category
The mux category for the SDP "max-message-size" attribute is CAUTION. The mux category for the SDP "max-message-size" attribute is CAUTION.
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May 2017, <https://www.rfc-editor.org/info/rfc8174>. May 2017, <https://www.rfc-editor.org/info/rfc8174>.
[RFC8261] Tuexen, M., Stewart, R., Jesup, R., and S. Loreto, [RFC8261] Tuexen, M., Stewart, R., Jesup, R., and S. Loreto,
"Datagram Transport Layer Security (DTLS) Encapsulation of "Datagram Transport Layer Security (DTLS) Encapsulation of
SCTP Packets", RFC 8261, DOI 10.17487/RFC8261, November SCTP Packets", RFC 8261, DOI 10.17487/RFC8261, November
2017, <https://www.rfc-editor.org/info/rfc8261>. 2017, <https://www.rfc-editor.org/info/rfc8261>.
[RFC8842] Holmberg, C. and R. Shpount, "Session Description Protocol [RFC8842] Holmberg, C. and R. Shpount, "Session Description Protocol
(SDP) Offer/Answer Considerations for Datagram Transport (SDP) Offer/Answer Considerations for Datagram Transport
Layer Security (DTLS) and Transport Layer Security (TLS)", Layer Security (DTLS) and Transport Layer Security (TLS)",
RFC 8842, DOI 10.17487/RFC8842, August 2020, RFC 8842, DOI 10.17487/RFC8842, January 2021,
<https://www.rfc-editor.org/info/rfc8842>. <https://www.rfc-editor.org/info/rfc8842>.
[RFC8859] Nandakumar, S., "A Framework for Session Description [RFC8859] Nandakumar, S., "A Framework for Session Description
Protocol (SDP) Attributes When Multiplexing", RFC 8859, Protocol (SDP) Attributes When Multiplexing", RFC 8859,
DOI 10.17487/RFC8859, August 2020, DOI 10.17487/RFC8859, January 2021,
<https://www.rfc-editor.org/info/rfc8859>. <https://www.rfc-editor.org/info/rfc8859>.
16.2. Informative References 16.2. Informative References
[RFC8445] Keranen, A., Holmberg, C., and J. Rosenberg, "Interactive [RFC8445] Keranen, A., Holmberg, C., and J. Rosenberg, "Interactive
Connectivity Establishment (ICE): A Protocol for Network Connectivity Establishment (ICE): A Protocol for Network
Address Translator (NAT) Traversal", RFC 8445, Address Translator (NAT) Traversal", RFC 8445,
DOI 10.17487/RFC8445, July 2018, DOI 10.17487/RFC8445, July 2018,
<https://www.rfc-editor.org/info/rfc8445>. <https://www.rfc-editor.org/info/rfc8445>.
[RFC8831] Jesup, R., Loreto, S., and M. Tüxen, "WebRTC Data [RFC8831] Jesup, R., Loreto, S., and M. Tüxen, "WebRTC Data
Channels", RFC 8831, DOI 10.17487/RFC8831, August 2020, Channels", RFC 8831, DOI 10.17487/RFC8831, January 2021,
<https://www.rfc-editor.org/info/rfc8831>. <https://www.rfc-editor.org/info/rfc8831>.
[RFC8832] Jesup, R., Loreto, S., and M. Tüxen, "WebRTC Data Channel [RFC8832] Jesup, R., Loreto, S., and M. Tüxen, "WebRTC Data Channel
Establishment Protocol", RFC 8832, DOI 10.17487/RFC8832, Establishment Protocol", RFC 8832, DOI 10.17487/RFC8832,
August 2020, <https://www.rfc-editor.org/info/rfc8832>. January 2021, <https://www.rfc-editor.org/info/rfc8832>.
[RFC8864] Drage, K., Makaraju, M., Ejzak, R., Marcon, J., and R. [RFC8864] Drage, K., Makaraju, M., Ejzak, R., Marcon, J., and R.
Even, "Negotiation of WebRTC Data Channels Using the Even, Ed., "Negotiation Data Channels Using the Session
Session Description Protocol (SDP)", RFC 8864, Description Protocol (SDP)", RFC 8864,
DOI 10.17487/RFC8864, August 2020, DOI 10.17487/RFC8864, January 2021,
<https://www.rfc-editor.org/info/rfc8864>. <https://www.rfc-editor.org/info/rfc8864>.
Acknowledgements Acknowledgements
The authors wish to thank Harald Alvestrand, Randell Jesup, Paul The authors wish to thank Harald Alvestrand, Randell Jesup, Paul
Kyzivat, Michael Tüxen, Juergen Stoetzer-Bradler, Flemming Andreasen, Kyzivat, Michael Tüxen, Juergen Stoetzer-Bradler, Flemming Andreasen,
and Ari Keränen for their comments and useful feedback. Ben Campbell and Ari Keränen for their comments and useful feedback. Ben Campbell
provided comments as part of his Area Director review. Brian provided comments as part of his Area Director review. Brian
Carpenter performed the Gen-ART review. Carpenter performed the Gen-ART review.
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