Session Description Protocol (SDP) Offer/Answer procedures for Interactive Connectivity Establishment (ICE)
draft-ietf-mmusic-ice-sip-sdp-39
MMUSIC M. Petit-Huguenin
Internet-Draft Impedance Mismatch
Obsoletes: 5245 (if approved) S. Nandakumar
Intended status: Standards Track Cisco Systems
Expires: February 14, 2020 C. Holmberg
A. Keranen
Ericsson
R. Shpount
TurboBridge
August 13, 2019
Session Description Protocol (SDP) Offer/Answer procedures for
Interactive Connectivity Establishment (ICE)
draft-ietf-mmusic-ice-sip-sdp-39
Abstract
This document describes Session Description Protocol (SDP) Offer/
Answer procedures for carrying out Interactive Connectivity
Establishment (ICE) between the agents.
This document obsoletes RFC 5245.
Status of This Memo
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This Internet-Draft will expire on February 14, 2020.
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Petit-Huguenin, et al. Expires February 14, 2020 [Page 1]
Internet-Draft ICE SDP Usage August 2019
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Conventions . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4
4. SDP Offer/Answer Procedures . . . . . . . . . . . . . . . . . 4
4.1. Introduction . . . . . . . . . . . . . . . . . . . . . . 4
4.2. Generic Procedures . . . . . . . . . . . . . . . . . . . 5
4.2.1. Encoding . . . . . . . . . . . . . . . . . . . . . . 5
4.2.2. RTP/RTCP Considerations . . . . . . . . . . . . . . . 6
4.2.3. Determining Role . . . . . . . . . . . . . . . . . . 6
4.2.4. STUN Considerations . . . . . . . . . . . . . . . . . 6
4.2.5. Verifying ICE Support Procedures . . . . . . . . . . 7
4.2.6. SDP Example . . . . . . . . . . . . . . . . . . . . . 8
4.3. Initial Offer/Answer Exchange . . . . . . . . . . . . . . 8
4.3.1. Sending the Initial Offer . . . . . . . . . . . . . . 8
4.3.2. Sending the Initial Answer . . . . . . . . . . . . . 9
4.3.3. Receiving the Initial Answer . . . . . . . . . . . . 10
4.3.4. Concluding ICE . . . . . . . . . . . . . . . . . . . 10
4.4. Subsequent Offer/Answer Exchanges . . . . . . . . . . . . 11
4.4.1. Sending Subsequent Offer . . . . . . . . . . . . . . 11
4.4.2. Sending Subsequent Answer . . . . . . . . . . . . . . 14
4.4.3. Receiving Answer for a Subsequent Offer . . . . . . . 16
5. Grammar . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
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