* 仕様書

[REFS[

-[1] [CITE@en[[[RFC 4566]]: SDP: Session Description Protocol]], [TIME[2023-12-02T07:30:22.000Z]], [TIME[2023-12-02T11:53:52.256Z]] <https://www.rfc-editor.org/rfc/rfc4566.html>
-- [7] [CITE@en[[[RFC 4566]]: SDP: Session Description Protocol]], [TIME[2023-12-02T07:30:22.000Z]], [TIME[2023-12-02T12:11:43.254Z]] <https://www.rfc-editor.org/rfc/rfc4566.html#page-25>
- [8] [CITE[RFC Errata Report » RFC Editor]], [TIME[2023-12-02T12:15:36.000Z]] <https://www.rfc-editor.org/errata/rfc4566>

]REFS]

* プロトコル

[FIG(short list)[ [2] [[SDP]]

- [CODE[e=][e= (SDP)]]
- [CODE[t=][t= (SDP)]]
- [CODE[r=][r= (SDP)]]
- [CODE[z=][z= (SDP)]]
- [CODE[charset]]
- [CODE[X-]]

]FIG]

* SDP の日時形式

[3] [[NTP time]]: 
[CODE[t=][t= (SDP)]]


[4] [[秒]]: 
[CODE[r=][r= (SDP)]]

[6] [[ミリ秒]]:
[CODE[ptime]] [SRC[>>7]], [CODE[maxptime]] [SRC[>>7]]


[5] [[時間帯]] (独自形式):
[CODE[z=][z= (SDP)]]

* 歴史

[11] [CITE@en[RFC 3266: Support for IPv6 in Session Description Protocol (SDP)]], [TIME[2023-12-02T11:54:23.000Z]], [TIME[2023-12-02T12:22:27.002Z]] <https://www.rfc-editor.org/rfc/rfc3266>

[12] [CITE[RFC Errata Report » RFC Editor]], [TIME[2023-12-02T12:22:42.000Z]] <https://www.rfc-editor.org/errata/rfc3266>

[9] [CITE@en[RFC 2327: SDP: Session Description Protocol]], [TIME[2023-12-02T11:54:22.000Z]], [TIME[2023-12-02T12:20:04.120Z]] <https://www.rfc-editor.org/rfc/rfc2327>

[10] [CITE[RFC Errata Report » RFC Editor]], [TIME[2023-12-02T12:21:18.000Z]] <https://www.rfc-editor.org/errata/rfc2327>

* メモ