RTP payload format for Enhanced Variable Rate Narrowband-Wideband Codec (EVRC-NW)
draft-ietf-avt-rtp-evrc-nw-06
Network Working Group Z. Fang
Internet-Draft Qualcomm
Intended status: Standards Track February 22, 2012
Expires: August 25, 2012
RTP payload format for Enhanced Variable Rate Narrowband-Wideband Codec
(EVRC-NW)
draft-ietf-avt-rtp-evrc-nw-06
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 e-mail.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Conventions . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Background . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4. EVRC-NW codec . . . . . . . . . . . . . . . . . . . . . . . . 6
5. RTP header usage . . . . . . . . . . . . . . . . . . . . . . . 7
6. Payload format . . . . . . . . . . . . . . . . . . . . . . . . 8
6.1. Encoding capability identification in EVRC-NW
interleaved/bundled format . . . . . . . . . . . . . . . . 8
7. Congestion Control Considerations . . . . . . . . . . . . . . 11
8. Storage format for the EVRC-NW Codec . . . . . . . . . . . . . 12
9. IANA considerations . . . . . . . . . . . . . . . . . . . . . 13
9.1. Media Type Registrations . . . . . . . . . . . . . . . . . 13
9.1.1. Registration of Media Type audio/EVRCNW . . . . . . . 13
9.1.2. Registration of Media Type audio/EVRCNW0 . . . . . . . 15
9.1.3. Registration of Media Type audio/EVRCNW1 . . . . . . . 16
10. SDP mode attributes for EVRC-NW . . . . . . . . . . . . . . . 19
11. Mode Change Request/Response Considerations . . . . . . . . . 20
12. Mapping EVRC-NW media type parameters into SDP . . . . . . . . 22
13. Offer-Answer Model Considerations for EVRC-NW . . . . . . . . 23
14. Declarative SDP Considerations . . . . . . . . . . . . . . . . 25
15. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
16. Security Considerations . . . . . . . . . . . . . . . . . . . 29
17. References . . . . . . . . . . . . . . . . . . . . . . . . . . 30
17.1. Normative References . . . . . . . . . . . . . . . . . . . 30
17.2. Informative References . . . . . . . . . . . . . . . . . . 30
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 32
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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 EVRC-WB
codec. EVRC-NW belongs to the EVRC family of codecs.
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