Session Description Protocol (SDP) Attributes for Open Mobile Alliance (OMA) Broadcast (BCAST) Service and Content Protection
RFC 5159
Document | Type |
RFC - Informational
(March 2008; No errata)
Was draft-dondeti-oma-mmusic-sdp-attrs (individual in rai area)
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Authors | Lakshminath Dondeti , Anja Jerichow | ||
Last updated | 2015-10-14 | ||
Replaces | draft-dondeti-oma-sip-sdp-attrs | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized bibtex | ||
Reviews | |||
Stream | WG state | (None) | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 5159 (Informational) | |
Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Cullen Jennings | ||
Send notices to | (None) |
Network Working Group L. Dondeti, Ed. Request for Comments: 5159 QUALCOMM, Inc. Category: Informational A. Jerichow Nokia Siemens Networks March 2008 Session Description Protocol (SDP) Attributes for Open Mobile Alliance (OMA) Broadcast (BCAST) Service and Content Protection Status of This Memo This memo provides information for the Internet community. It does not specify an Internet standard of any kind. Distribution of this memo is unlimited. Abstract This document provides descriptions of Session Description Protocol (SDP) attributes used by the Open Mobile Alliance's Broadcast Service and Content Protection specification. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . 2 3. New SDP Attributes . . . . . . . . . . . . . . . . . . . . . . 2 4. Security Considerations . . . . . . . . . . . . . . . . . . . . 3 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 3 5.1. Registration of New SDP Attributes . . . . . . . . . . . . 3 5.1.1. Registration of the Attribute bcastversion:<major>.<minor> . . . . . . . . . . . . . 3 5.1.2. Registration of the Attribute stkmstream:<id of the stkm stream> . . . . . . . . . . . . . . . . . . . 4 5.1.3. Registration of the Attribute SRTPAuthentication:<id for SRTP authentication algorithm value> . . . . . . . . . . . . . . . . . . . 5 5.1.4. Registration of the Attribute SRTPROCTxRate:<ROC transmission rate> . . . . . . . . . . . . . . . . . . 5 6. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 6 7. References . . . . . . . . . . . . . . . . . . . . . . . . . . 6 7.1. Normative References . . . . . . . . . . . . . . . . . . . 6 7.2. Informative References . . . . . . . . . . . . . . . . . . 6 Dondeti & Jerichow Informational [Page 1] RFC 5159 OMA BCAST SDP Attributes March 2008 1. Introduction The Open Mobile Alliance (OMA) Broadcast (BCAST) group is specifying service and content protection mechanisms for broadcast services over wireless networks. As part of that specification, several new SDP attributes are necessary to allow the broadcast server to signal the service and content protection parameters to clients. Section 8.2.4 of RFC 4566 [1] requires that new SDP attributes are registered through IANA with name, contact information, and description (and other similar parameters). A standards track specification is RECOMMENDED if the new attribute(s) will have widespread use and interoperability considerations. OMA BCAST specifications are expected to be used by broadcast wireless systems that are based on 3rd Generation Partnership Project (3GPP) Multimedia Broadcast/Multicast Service (MBMS), 3GPP2 Broadcast and Multicast Services (BCMCS), and Digital Video Broadcasting - Handheld (DVB-H). Although this would typically be considered a "widespread" use, in this case IETF chose to use a non-standards- track RFC to register the SDP attributes because OMA maintains change control of the documents that specify the interpretation of the values in the attributes. This document provides descriptions of the SDP attributes used in the OMA BCAST Service and Content Protection specification [2]. 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 RFC 2119 [3]. 3. New SDP Attributes The following new SDP attributes have been specified: o a=bcastversion:<major>.<minor> o a=stkmstream:<id of the stkm stream> o a=SRTPAuthentication:<id for SRTP authentication algorithm value> o a=SRTPROCTxRate:<ROC transmission rate> See Section 5 for details on IANA considerations. Dondeti & Jerichow Informational [Page 2] RFC 5159 OMA BCAST SDP Attributes March 2008 4. Security Considerations In addition to the notes in Section 7 of RFC 4566 [1], the following considerations may be applicable: The bcastversion parameter indicates the version of the broadcast system used for distribution of broadcast content. In case future versions indicated by this parameter allow for enhanced or additional security features, the bcastversion parameter, if unprotected, could be utilized for downgrade attacks. The stkmstream parameter provides references to relevant keyShow full document text