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4. IANA Considerations

4.1. Attribute Registration in Existing Registries​

IANA has registered the "msid" attribute in the "att-field" (media level only) registry within the "Session Description Protocol (SDP) Parameters" registry, according to the procedures of [RFC4566].

The "msid" registration information is as follows:

Contact name, email: IETF, contacted via [email protected], or a successor address designated by IESG

Attribute name: msid

Attribute syntax:

msid-value = msid-id [ SP msid-appdata ]
msid-id = 1*64token-char ; see RFC 4566
msid-appdata = 1*64token-char  ; see RFC 4566

Attribute semantics: Described in RFC 8830

Attribute value: msid-value

Long-form attribute name: MediaStream Identifier

Usage level: media

Subject to charset: The attribute value contains only ASCII characters and is therefore not subject to the charset attribute.

Purpose: The attribute can be used to signal the relationship between a WebRTC MediaStream and a set of media descriptions.

O/A Procedures: Described in RFC 8830

Appropriate values: The details of appropriate values are given in RFC 8830 (this document).

Mux Category: NORMAL

The Mux Category is defined in [RFC8859].

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