Media level ice-options SDP attribute
draft-petithuguenin-mmusic-ice-attributes-level-00

Abstract

This document redefines the ice-options SDP attribute as a session-level and media-level attribute.

Status of this Memo

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Table of Contents

• 1. Introduction
• 2. Terminology
• 3. ice-options Attribute
• 4. rtp+ecn ICE option
• 5. Security Considerations
• 6. IANA Considerations
• 7. Acknowledgements
• 8. References
• 8.1. Normative References
• 8.2. Informative References
• Appendix A. Release notes
• Author's Address

1. Introduction

ICE [RFC5245] defines the ice-options SDP attribute as session-level only attribute, but when ICE is used with disaggregated media (see section 3 of [I-D.loreto-splices-disaggregated-media]), there is a possibility that different media uses different ICE implementations and/or different networks, and so that differents media in the same SDP require different values for this attribute.

As an example, the ice-options attribute value "rtp+ecn" (defined in [I-D.ietf-avtcore-ecn-for-rtp]) signals ECN capability. Two aggregated media using two different RTP implementations may want to use different values for this attribute.

Note that there is a similar problem for the ice-lite attribute but unfortunately it does not seem possible to design a way to use the ice-lite attribute at the media level that is compatible with legacy implementations that recognize only the session-level attribute.

2. Terminology

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119].

3. ice-options Attribute

The ice-options attribute is a session-level and media-level attribute.

All future new ICE options must also defines how media-level ICE options using this new value are aggregated to eventually generate the value of the session-level ICE option, so legacy implementations that only recognize session-level ICE options can interoperate with implementations that recognize ICE options at both levels.

4. rtp+ecn ICE option

If all aggregated media contains the "rtp+ecn" ICE option defined by [I-D.ietf-avtcore-ecn-for-rtp], then an "rtp+ecn" ICE option MUST be inserted at the session-level.

5. Security Considerations

TBD

6. IANA Considerations

TBD

7. Acknowledgements

This document was written with the xml2rfc tool described in [RFC2629].

8. References

8.1. Normative References

8.2. Informative References

Appendix A. Release notes

This section must be removed before publication as an RFC.

Author's Address