registeration of G7110 media subtype for G.711.0 payload
2014-03-04 14:18:32 GMT
draft-ietf-payload-g7110-02 has passed Working Group Last Call in the Payload Working Group. The document registers media subtype G7110.
The new registrations are in Section 5.1 of the document and is also given bellow.
Comments on the registration are welcome.
Payload WG co-chair
Media Type Registration
Type name: audio
Subtype name: G7110
rate: The RTP timestamp clock rate, which is equal to the sampling
rate. The typical rate used with G.711 encoding is 8000, but
other rates may be specified. The default rate is 8000.
complaw: Indicates the companding law (A-law or mu-law) employed.
The case-insensitive values are "al" or "mu" for A-law and mu-law,
channels: See RFC 4566 [RFC4566] for definition. Specifies how
many audio streams are represented in the G.711.0 payload and MUST
be present if the number of channels is greater than one. This
parameter defaults to 1 if not present (as per RFC 4566) and is
typically a non-zero small-valued positive integer. It is
expected that implementations that specify multiple channels will
also define a mechanism to map the channels appropriately within
their system design, otherwise the channel order specified in RFC
3551 [RFC3551] Section 4.1 will be assumed (e.g., left, right,
center, ... ).
maxptime: See RFC 4566 [RFC4566] for definition.
ptime: See RFC 4566 [RFC4566] for definition. The inclusion of
"ptime" is RECOMMENDED and SHOULD be in the SDP unless there is an
application specific reason not to include it (e.g., an
application that has a variable ptime on a packet-by-packet
basis). For constant ptime applications, it is considered good
form to include "ptime" in the SDP for session diagnostic
purposes. For the constant ptime multiple channel case described
in Section 4.2.2, the inclusion of "ptime" can provide a desirable
This media type is framed binary data (see Section 4.8 in RFC 6838
[RFC6838]) compressed as per ITU-T Rec. G.711.0.
See Section 10.
Interoperability considerations: none
ITU-T Rec. G.711.0 and RFC XXXX.
[ RFC Editor: please replace XXXXX with a reference to this RFC ]
Applications that use this media type:
Although initially conceived for VoIP, the use of G.711.0, like
G.711 before it, may find use within audio and video streaming and
/or conferencing applications for the audio portion of those
The following applies to stored-file transfer methods:
Magic numbers: #!G7110A\n or #!G7110M\n (for A-law or MU-law
encodings respectively, see Section 6).
File Extensions: None
Macintosh file type code: None
Object identifier or OIL: None
Person & email address to contact for further information:
Michael A. Ramalho <mramalho <at> cisco.com> or <mar42 <at> cornell.edu>
Intended usage: COMMON
Restrictions on usage:
This media type depends on RTP framing, and hence is only defined
for transfer via RTP [RFC3550]. Transport within other framing
protocols is not defined at this time.
Author: Michael A. Ramalho
IETF Payload working group delegated from the IESG.
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