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8. IANA Considerations

This document updates various IANA registries that were created by [RFC4566]. The registries are:

  • The "application/sdp" Media Type
  • The SDP Parameters registry
  • The Session Description Protocol (SDP) Parameters registry

8.1. The "application/sdp" Media Type​

The "application/sdp" media type is used to convey session descriptions in SDP format.

Type name: application

Subtype name: sdp

Required parameters: None

Optional parameters: None

Encoding considerations: SDP files are primarily UTF-8 format text. The "a=charset:" attribute may be used to signal the presence of other character sets.

Security considerations: See Section 7 of RFC 8866

Interoperability considerations: None

Published specification: RFC 8866

Applications that use this media type: Voice over IP, video streaming, presence, instant messaging, and other multimedia applications.

8.2. Registration of SDP Parameters​

IANA maintains a registry of SDP parameters. The registry includes:

  • Media types ("m=" line)
  • Transport protocols ("m=" line)
  • Attribute names ("a=" line)
  • Bandwidth specifiers ("b=" line)
  • Network types ("c=" line)
  • Address types ("c=" line)

New SDP parameters are registered by IANA according to the procedures defined in this specification and in [RFC8126].

8.3. Media Types ("media" Subfield of the "m=" Line)​

IANA maintains a registry of media types for the "m=" line.

Registration Procedure: Standards Action or IESG Approval

Registered values:

  • audio
  • video
  • text
  • application
  • message

8.4. Transport Protocols ("proto" Subfield of the "m=" Line)​

IANA maintains a registry of transport protocol identifiers.

Registration Procedure: RFC Required

Examples include:

  • RTP/AVP
  • RTP/SAVP
  • udp
  • TCP

8.5. Attribute Names ("att-field" Subfield of the "a=" Line)​

IANA maintains a registry of SDP attribute names.

Registration Procedure: Specification Required

Attributes defined in this document include:

  • cat, keywds, tool, ptime, maxptime, rtpmap
  • recvonly, sendrecv, sendonly, inactive
  • orient, type, charset, sdplang, lang
  • framerate, quality, fmtp

8.6. Bandwidth Specifiers ("bwtype" Subfield of the "b=" Line)​

IANA maintains a registry of bandwidth specifier names.

Registration Procedure: RFC Required

Defined values:

  • CT (Conference Total)
  • AS (Application Specific)

8.7. Network Types ("nettype" Subfield of the "c=" and "o=" Lines)​

IANA maintains a registry of network type identifiers.

Registration Procedure: RFC Required

Registered value:

  • IN (Internet)
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