Media Type Sub-Parameter Registries

Created

2003-10-31

Last Updated

2026-07-20

Available Formats

Sub-Parameter Registry video/mpeg4-generic, audio/mpeg4-generic and application/mpeg4-generic

Registration Procedure(s)

Specification Required

Expert(s)

Unassigned

Reference

RFC 3640: RTP Payload Format for Transport of MPEG-4 Elementary Streams

Available Formats

Modes	Reference
mode=generic	RFC 3640
mode=CELP-cbr	RFC 3640
mode=CELP-vbr	RFC 3640
mode=AAC-lbr	RFC 3640
mode=AAC-hbr	RFC 3640
mode=rtp-midi	RFC 6295

Sub-Parameter Registry for mode=rtp-midi of audio/mpeg4-generic

Registration Procedure(s)

See sub-registries below

Reference

RFC 6295: RTP Payload Format for MIDI

j_sec Values

Registration Procedure(s)

Standards Action

Reference

RFC 6295: RTP Payload Format for MIDI

Available Formats

j_sec Value	Reference
j_sec=none	RFC 6295
j_sec=recj	RFC 6295

j_update Values

Registration Procedure(s)

Standards Action

Reference

RFC 6295: RTP Payload Format for MIDI

Available Formats

j_update Value	Reference
j_update=anchor	RFC 6295
j_update=open-loop	RFC 6295
j_update=closed-loop	RFC 6295

render Values

Registration Procedure(s)

Specification Required

Expert(s)

Unassigned

Reference

RFC 6295: RTP Payload Format for MIDI

Available Formats

render Value	Reference
render=unknown	RFC 6295
render=synthetic	RFC 6295
render=null	RFC 6295

subrender Values

Registration Procedure(s)

Specification Required

Expert(s)

Unassigned

Reference

RFC 6295: RTP Payload Format for MIDI

Available Formats

subrender Value	Reference
subrender=default	RFC 6295

smf_info Values

Registration Procedure(s)

Specification Required

Expert(s)

Unassigned

Reference

RFC 6295: RTP Payload Format for MIDI

Available Formats

smf_info Value	Reference
smf_info=ignore	RFC 6295
smf_info=sdp_start	RFC 6295
smf_info=identity	RFC 6295

Sub-Parameter Registry for audio/rtp-midi

Registration Procedure(s)

See sub-registries below

Reference

RFC 6295: RTP Payload Format for MIDI

j_sec Values

Registration Procedure(s)

Standards Action

Reference

RFC 6295: RTP Payload Format for MIDI

Available Formats

j_sec Value	Reference
j_sec=none	RFC 6295
j_sec=recj	RFC 6295

j_update Values

Registration Procedure(s)

Standards Action

Reference

RFC 6295: RTP Payload Format for MIDI

Available Formats

j_update Value	Reference
j_update=anchor	RFC 6295
j_update=open-loop	RFC 6295
j_update=closed-loop	RFC 6295

render Values

Registration Procedure(s)

Specification Required

Expert(s)

Unassigned

Reference

RFC 6295: RTP Payload Format for MIDI

Available Formats

render Value	Reference
render=unknown	RFC 6295
render=synthetic	RFC 6295
render=api	RFC 6295
render=null	RFC 6295

subrender Values

Registration Procedure(s)

Specification Required

Expert(s)

Unassigned

Reference

RFC 6295: RTP Payload Format for MIDI

Available Formats

subrender Value	Reference
subrender=default	RFC 6295

smf_info Value

Registration Procedure(s)

Specification Required

Expert(s)

Unassigned

Reference

RFC 6295: RTP Payload Format for MIDI

Available Formats

smf_info Value	Reference
smf_info=ignore	RFC 6295
smf_info=sdp_start	RFC 6295
smf_info=identity	RFC 6295

Sub-Parameter Registry for video/raw

Registration Procedure(s)

See sub-registries below

Reference

RFC 4175: RTP Payload Format for Uncompressed Video

Color (sub-)sampling

Registration Procedure(s)

Specification Required

Expert(s)

Ali Begen

Reference

RFC 4175: RTP Payload Format for Uncompressed Video

Available Formats

Color (sub-)sampling	Reference
sampling=RGB	RFC 4175
sampling=RGBA	RFC 4175
sampling=BGR	RFC 4175
sampling=BGRA	RFC 4175
sampling=YCbCr-4:4:4	RFC 4175
sampling=YCbCr-4:2:2	RFC 4175
sampling=YCbCr-4:2:0	RFC 4175
sampling=YCbCr-4:1:1	RFC 4175
sampling=RGB+	RFC 4421
sampling=RG+B	RFC 4421
sampling=R+GB	RFC 4421
sampling=BGR+	RFC 4421
sampling=BG+R	RFC 4421
sampling=B+GR	RFC 4421

Colorimetry

Registration Procedure(s)

Specification Required

Expert(s)

Ali Begen

Reference

RFC 4175: RTP Payload Format for Uncompressed Video

Available Formats

Colorimetry	Reference
colorimetry=BT601-5	RFC 4175
colorimetry=BT709-2	RFC 4175
colorimetry=SMPTE240M	RFC 4175

Sub-parameter Registry for application/mbox

Registration Procedure(s)

Specification Required

Expert(s)

Unassigned

Reference

RFC 4155: The application/mbox Media Type

Available Formats

Format Value	Reference
format=default	RFC 4155

Parameter Values for the smime-type Parameter

Registration Procedure(s)

Specification Required

Expert(s)

Russ Housley, Sean Turner (secondary)

Reference

RFC 7114: Creation of a Registry for smime-type Parameter Values

Available Formats

smime-type Value	Reference
authEnveloped-data	RFC 8551, Section 3.2.2
certs-only	RFC 8551, Section 3.2.2
CMC-Request	RFC 10003, Section 5
CMC-Response	RFC 10003, Section 5
compressed-data	RFC 8551, Section 3.2.2
enveloped-data	RFC 8551, Section 3.2.2
enveloped-x400	RFC 3854, Section 3.3.1
server-generated-key	RFC 7030, Section 4.4.2
signed-data	RFC 8551, Section 3.2.2
signed-receipt	RFC 2634, Section 2.4
signed-x400	RFC 3854, Section 3.2.1

CMS Encapsulating Content Types

Registration Procedure(s)

Expert Review

Expert(s)

Russ Housley, Sean Turner

Reference

RFC 7193: The application/cms Media Type

Available Formats

Name	Object Identifier	Reference
authData	1.2.840.113549.1.9.16.1.2	RFC 5652
compressedData	1.2.840.113549.1.9.16.1.9	RFC 3274
contentCollection	1.2.840.113549.1.9.16.1.19	RFC 4073
contentInfo	1.2.840.113549.1.9.16.1.6	RFC 5652
contentWithAttrs	1.2.840.113549.1.9.16.1.20	RFC 4073
authEnvelopedData	1.2.840.113549.1.9.16.1.23	RFC 5083
encryptedKeyPkg	2.16.840.1.101.2.1.2.78.2	RFC 6032
digestData	1.2.840.113549.1.7.5	RFC 5652
encryptedData	1.2.840.113549.1.7.6	RFC 5652
envelopedData	1.2.840.113549.1.7.3	RFC 5652
signedData	1.2.840.113549.1.7.2	RFC 5652

CMS Inner Content Types

Registration Procedure(s)

Expert Review

Expert(s)

Russ Housley, Sean Turner

Reference

RFC 7193: The application/cms Media Type

Available Formats

Name	Object Identifier	Reference
firmwarePackage	1.2.840.113549.1.9.16.1.16	RFC 4108
firmwareLoadReceipt	1.2.840.113549.1.9.16.1.17	RFC 4108
firmwareLoadError	1.2.840.113549.1.9.16.1.18	RFC 4108
aKeyPackage	2.16.840.1.101.2.1.2.78.5	RFC 5958
sKeyPackage	1.2.840.113549.1.9.16.1.25	RFC 6031
trustAnchorList	1.2.840.113549.1.9.16.1.34	RFC 5914
TAMP-statusQuery	2.16.840.1.101.2.1.2.77.1	RFC 5934
TAMP-statusResponse	2.16.840.1.101.2.1.2.77.2	RFC 5934
TAMP-update	2.16.840.1.101.2.1.2.77.3	RFC 5934
TAMP-updateConfirm	2.16.840.1.101.2.1.2.77.4	RFC 5934
TAMP-apexUpdate	2.16.840.1.101.2.1.2.77.5	RFC 5934
TAMP-apexUpdateConfirm	2.16.840.1.101.2.1.2.77.6	RFC 5934
TAMP-communityUpdate	2.16.840.1.101.2.1.2.77.7	RFC 5934
TAMP-communityUpdateConfirm	2.16.840.1.101.2.1.2.77.8	RFC 5934
TAMP-seqNumAdjust	2.16.840.1.101.2.1.2.77.10	RFC 5934
TAMP-seqNumAdjustConfirm	2.16.840.1.101.2.1.2.77.11	RFC 5934
TAMP-error	2.16.840.1.101.2.1.2.77.9	RFC 5934
keyPackageReceipt	2.16.840.1.101.2.1.2.78.3	RFC 7191
keyPackageError	2.16.840.1.101.2.1.2.78.6	RFC 7191
cbor	1.2.840.113549.1.9.16.1.44	RFC 8769
cborSequence	1.2.840.113549.1.9.16.1.45	RFC 8769

Report Types

Registration Procedure(s)

Specification Required

Expert(s)

Murray Kucherawy

Reference

RFC 8460: SMTP TLS Reporting

Available Formats

Report-Type	Media Type	Reference	Comment
tlsrpt	application/tlsrpt+gzip, application/tlsrpt+json	RFC 8460	Media types suitable for use with this report-type are defined in Sections 6.4, 6.5 of RFC 8460
disposition-notification	message/disposition-notification	RFC 8098, Section 10
disposition-notification	message/global-disposition-notification	RFC 6533, Section 6
delivery-status	message/delivery-status	RFC 3464, Section 2.1
delivery-status	message/global-delivery-status	RFC 6533, Section 6

Sub-Parameter Registry for application/aif+cbor and application/aif+json

Registration Procedure(s)

Specification Required

Expert(s)

Göran Selander

Reference

RFC 9237: An Authorization Information Format (AIF) for Authentication and Authorization for Constrained Environments (ACE)

Available Formats

Parameter	Name	Description/Specification	Reference
Toid	URI-local-part	local-part of URI	RFC 9237
Tperm	REST-method-set	set of REST methods represented	RFC 9237
Toid	mqtt-topic-filter	Topic Filter, as defined in Section 2.3 of RFC 9431.	RFC 9431, Section 2.3
Tperm	mqtt-permissions	Permissions for the MQTT Client, as defined in Section 2.3 of RFC 9431. Tperm is an array of one or more text strings that each have a value of either "pub" or "sub".	RFC 9431, Section 2.3
Toid	CRI-local-part	local-part of CRI	RFC-ietf-core-href-29, Section 8.3
Toid	oscore-gname	OSCORE group name	RFC-ietf-ace-key-groupcomm-oscore-21
Tperm	oscore-gperm	permissions pertaining OSCORE groups	RFC-ietf-ace-key-groupcomm-oscore-21