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The conference participant client C asks the media server M to record the audio and video portions of a meeting. The client uses the ANNOUNCE method to provide meta-information about the recorded session to the server.
16 Syntax
The RTSP syntax is described in an augmented Backus-Naur form (BNF).
Base Syntax
OCTET =
CHAR =
UPALPHA =
LOALPHA =
ALPHA = UPALPHA | LOALPHA

DIGIT =
CTL = (octets 0 - 31) and DEL (127)>
CR =
LF =

SP =
HT =
<"> =
CRLF = CR LF
LWS = [CRLF] 1*( SP | HT )
TEXT =
tspecials = "(" | ")" | "<" | ">" | "@"
| "," | ";" | ":" | "\" | <">
| "/" | "[" | "]" | "?" | "="
| "{" | "}" | SP | HT

token = 1*
quoted-string = ( <"> *(qdtext) <"> )
qdtext = hats <">>
quoted-pair = "\" CHAR

message-header = field-name ":" [ field-value ] CRLF
field-name = token
field-value = *( field-content | LWS )
field-content = consisting of either *TEXT or
combinations of token, tspecials, and
quoted-string>

safe = "\$" | "-" | "_" | "." | "+"
extra = "!" | "*" | "$'$" | "(" | ")" | ","

hex = DIGIT | "A" | "B" | "C" | "D" | "E" | "F" |
"a" | "b" | "c" | "d" | "e" | "f"
escape = "\%" hex hex
reserved = ";" | "/" | "?" | ":" | "@" | "&" | "="

unreserved = alpha | digit | safe | extra
xchar = unreserved | reserved | escape