Jingle RTP Sessions (XEP-0167) [1] defines the Jingle (XEP-0166) [2] signalling exchanges needed to establish voice and video chat using the Real-time Transport Protocol RFC 3550 [3]; however, it does not specify the recommended voice and video codecs, since the state of codec technologies is more fluid than the signalling interactions. This specification defines the recommended codecs for the sake of interoperability between Jingle voice and video applications.
The following requirements apply to codec recommendations.
The Speex codec is an open source / free software, patent-free, audio compression format for the encoding of human speech; it is developed and maintained by xiph.org. The following table summarizes the available information about Speex.
| Quality | RTP Packetization | Availability | Patent Encumbrance |
|---|---|---|---|
| Good quality; optimized for voice; can be used for wide-band audio. | See RFC 5574 [4]. | Widely available and freely downloadable under a revised BSD license at <http://speex.org/>. | Designed to be patent-free. |
G.711 refers to the Pulse Code Modulation (PCM) codec defined in International Telecommunication Union (ITU) [5] recommendation G.711, which is widely used on the public switched telephone network (PSTN) and by many voice over Internet Protocol (VoIP) providers. There are two versions: the μ-law ("U-law") version is widely deployed in North America and in Japan and the A-law version is widely deployed in the rest of the world. The following table summarizes the available information about G.711.
The Theora codec is an open source / free software, patent-free, video compression format developed and maintained by xiph.org. The following table summarizes the available information about Theora.
| Quality | RTP Packetization | Availability | Patent Encumbrance |
|---|---|---|---|
| Unknown. | See RTP Payload Format for Theora Encoded Video [7]. | Widely available and freely downloadable under a revised BSD license at <http://theora.org/>. | Designed to be patent-free. |
H.264 is a technology for video compression jointly designed by the ITU and the International Organization for Standardization (ISO) [8]. The following table summarizes the available information about Theora.
For security considerations, refer to XEP-0167.
This document requires no interaction with the Internet Assigned Numbers Authority (IANA) [10].
This document requires no interaction with the XMPP Registrar [11].
Thanks to Olivier Crête, Dave Cridland, Justin Karneges, Tobias Markmann, Jeff Muller, Arc Riley, Kevin Smith, Justin Uberti, and Paul Witty for their feedback.
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The Extensible Messaging and Presence Protocol (XMPP) is defined in the XMPP Core (RFC 6120) and XMPP IM (RFC 6121) specifications contributed by the XMPP Standards Foundation to the Internet Standards Process, which is managed by the Internet Engineering Task Force in accordance with RFC 2026. Any protocol defined in this document has been developed outside the Internet Standards Process and is to be understood as an extension to XMPP rather than as an evolution, development, or modification of XMPP itself.
There exists a special venue for discussion related to the technology described in this document: the <jingle@xmpp.org> mailing list.
The primary venue for discussion of XMPP Extension Protocols is the <standards@xmpp.org> discussion list.
Discussion on other xmpp.org discussion lists might also be appropriate; see <https://xmpp.org/community/> for a complete list.
Errata can be sent to <editor@xmpp.org>.
The following requirements keywords as used in this document are to be interpreted as described in RFC 2119: "MUST", "SHALL", "REQUIRED"; "MUST NOT", "SHALL NOT"; "SHOULD", "RECOMMENDED"; "SHOULD NOT", "NOT RECOMMENDED"; "MAY", "OPTIONAL".
1. XEP-0167: Jingle RTP Sessions <https://xmpp.org/extensions/xep-0167.html>.
2. XEP-0166: Jingle <https://xmpp.org/extensions/xep-0166.html>.
3. RFC 3550: RTP: A Transport Protocol for Real-Time Applications <http://tools.ietf.org/html/rfc3550>.
4. RFC 5574: RTP Payload Format for the Speex Codec <http://tools.ietf.org/html/rfc5574>.
5. The International Telecommunication Union develops technical and operating standards (such as H.323) for international telecommunication services. For further information, see <http://www.itu.int/>.
6. RFC 5391: RTP Payload Format for ITU-T Recommendation G.711.1 <http://tools.ietf.org/html/rfc5391>.
7. RTP Payload Format for Theora Encoded Video <http://tools.ietf.org/html/draft-barbato-avt-rtp-theora>. Work in progress.
8. The International Organization for Standardization develops standards a wide variety of technical domains. For further information, see <http://www.iso.org/>.
9. RFC 3984: RTP Payload Format for H.264 Video <http://tools.ietf.org/html/rfc3984>.
10. The Internet Assigned Numbers Authority (IANA) is the central coordinator for the assignment of unique parameter values for Internet protocols, such as port numbers and URI schemes. For further information, see <http://www.iana.org/>.
11. The XMPP Registrar maintains a list of reserved protocol namespaces as well as registries of parameters used in the context of XMPP extension protocols approved by the XMPP Standards Foundation. For further information, see <https://xmpp.org/registrar/>.
Note: Older versions of this specification might be available at https://xmpp.org/extensions/attic/
Added more information about video codecs.
First draft, copied from XEP-0167 with slight revisions and addition of requirements section.
@report{saint-andre2009n/a,
title = {Mandatory-to-Implement Technologies for Jingle RTP Sessions},
author = {Saint-Andre, Peter},
type = {XEP},
number = {xxxx},
version = {0.0.2},
institution = {XMPP Standards Foundation},
url = {https://xmpp.org/extensions/xep-xxxx.html},
date = {2009-03-04/2009-03-04},
}END