Session Description Protocol (SDP) Extension For Setting Audio and Video Media Streams Over Circuit-Switched Bearers In The Public Switched Telephone Network (PSTN)
draft-ietf-mmusic-sdp-cs-21
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MMUSIC WG M. Garcia-Martin
Internet-Draft Ericsson
Intended status: Standards Track S. Veikkolainen
Expires: December 28, 2013 Nokia
June 26, 2013
Session Description Protocol (SDP) Extension For Setting Audio and Video
Media Streams Over Circuit-Switched Bearers In The Public Switched
Telephone Network (PSTN)
draft-ietf-mmusic-sdp-cs-21
Abstract
This memo describes use cases, requirements, and protocol extensions
for using the Session Description Protocol (SDP) Offer/Answer model
for establishing audio and video media streams over circuit-switched
bearers in the Public Switched Telephone Network (PSTN).
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on December 28, 2013.
Copyright Notice
Copyright (c) 2013 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
(http://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
Garcia-Martin & VeikkolaExpires December 28, 2013 [Page 1]
Internet-Draft PSTN Circuit-Switched Bearers in SDP June 2013
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Conventions Used in This Document . . . . . . . . . . . . . . 4
3. Requirements . . . . . . . . . . . . . . . . . . . . . . . . 4
4. Overview of Operation . . . . . . . . . . . . . . . . . . . . 5
4.1. Example Call Flow . . . . . . . . . . . . . . . . . . . . 5
5. Protocol Description . . . . . . . . . . . . . . . . . . . . 7
5.1. Level of Compliance . . . . . . . . . . . . . . . . . . . 7
5.2. Extensions to SDP . . . . . . . . . . . . . . . . . . . . 7
5.2.1. Connection Data . . . . . . . . . . . . . . . . . . . 7
5.2.2. Media Descriptions . . . . . . . . . . . . . . . . . 9
5.2.3. Correlating the PSTN Circuit-Switched Bearer with SDP 10
5.2.3.1. The "cs-correlation" attribute . . . . . . . . . 11
5.2.3.2. Caller-ID Correlation Mechanism . . . . . . . . . 11
5.2.3.3. User-User Information Element Correlation
Mechanism . . . . . . . . . . . . . . . . . . . . 12
5.2.3.4. DTMF Correlation Mechanism . . . . . . . . . . . 14
5.2.3.5. Extensions to correlation mechanisms . . . . . . 15
5.3. Negotiating the correlation mechanisms . . . . . . . . . 15
5.3.1. Determining the Direction of the Circuit-Switched
Bearer Setup . . . . . . . . . . . . . . . . . . . . 15
5.3.2. Populating the cs-correlation attribute . . . . . . . 16
5.3.3. Considerations on correlations . . . . . . . . . . . 17
5.4. Considerations for Usage of Existing SDP . . . . . . . . 18
5.4.1. Originator of the Session . . . . . . . . . . . . . . 18
5.4.2. Contact information . . . . . . . . . . . . . . . . . 18
5.5. Considerations for Usage of Third Party Call Control
(3PCC) . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.6. Offer/Answer mode extensions . . . . . . . . . . . . . . 19
5.6.1. Generating the Initial Offer . . . . . . . . . . . . 19
5.6.2. Generating the Answer . . . . . . . . . . . . . . . . 21
5.6.3. Offerer processing the Answer . . . . . . . . . . . . 24
5.6.4. Modifying the session . . . . . . . . . . . . . . . . 26
5.7. Formal Syntax . . . . . . . . . . . . . . . . . . . . . . 26
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