RTP Payload Format for the Enhanced Variable Rate Narrowband-Wideband Codec (EVRC-NW)
RFC 6884
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RFC - Proposed Standard
(March 2013; No errata)
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Last updated |
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2015-10-14
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Replaces |
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draft-zfang-avt-rtp-evrc-nw
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IETF
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plain text
pdf
htmlized
bibtex
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Reviews |
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WG state
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Submitted to IESG for Publication
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Document shepherd |
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Roni Even
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Shepherd write-up |
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Show
(last changed 2012-11-19)
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IESG state |
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RFC 6884 (Proposed Standard)
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Consensus Boilerplate |
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Unknown
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Telechat date |
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Responsible AD |
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Robert Sparks
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IESG note |
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Roni Even (roni.even@mail01.huawei.com) is the Document Shepherd.
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Send notices to |
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(None)
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Internet Engineering Task Force (IETF) Z. Fang
Request for Comments: 6884 Qualcomm Incorporated
Category: Standards Track March 2013
ISSN: 2070-1721
RTP Payload Format
for the Enhanced Variable Rate Narrowband-Wideband Codec (EVRC-NW)
Abstract
This document specifies Real-time Transport Protocol (RTP) payload
formats to be used for the Enhanced Variable Rate Narrowband-Wideband
Codec (EVRC-NW). Three media type registrations are included for
EVRC-NW RTP payload formats. In addition, a file format is specified
for transport of EVRC-NW speech data in storage mode applications
such as email.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc6884.
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
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Fang Standards Track [Page 1]
RFC 6884 EVRC-NW RTP Payload Format March 2013
Table of Contents
1. Introduction ....................................................2
2. Conventions .....................................................2
3. Background ......................................................3
4. EVRC-NW Codec ...................................................3
5. RTP Header Usage ................................................4
6. Payload Format ..................................................4
6.1. Encoding Capability Identification in EVRC-NW
Interleaved/Bundled Format .................................5
7. Congestion Control Considerations ...............................6
8. Storage Format for the EVRC-NW Codec ............................6
9. IANA Considerations .............................................7
9.1. Media Type Registrations ...................................7
9.1.1. Registration of Media Type audio/EVRCNW .............7
9.1.2. Registration of Media Type audio/EVRCNW0 ............9
9.1.3. Registration of Media Type audio/EVRCNW1 ...........10
10. SDP Mode Attributes for EVRC-NW ...............................12
11. Mode Change Request/Response Considerations ...................13
12. Mapping EVRC-NW Media Type Parameters into SDP ................14
13. Offer-Answer Model Considerations for EVRC-NW .................14
14. Declarative SDP Considerations ................................16
15. Examples ......................................................16
16. Security Considerations .......................................19
17. References ....................................................19
17.1. Normative References .....................................19
17.2. Informative References ...................................20
1. Introduction
This document specifies the payload formats for packetization of
EVRC-NW encoded speech signals into the Real-time Transport Protocol
(RTP). It defines support for the header-free, interleaved/bundled,
and compact bundle packet formats for the EVRC-NW codec as well as
discontinuous transmission (DTX) support for EVRC-NW encoded speech
transported via RTP. The EVRC-NW codec offers better speech quality
than the EVRC and EVRC-B codecs and better capacity than the Enhanced
Variable Rate Wideband Codec (EVRC-WB). EVRC-NW belongs to the EVRC
family of codecs.
2. Conventions
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 [1].
Fang Standards Track [Page 2]
RFC 6884 EVRC-NW RTP Payload Format March 2013
3. Background
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