ABNF for SDP: from RFC 8866 and other RFCs
(still based on RFC 4566)
; "t=" time the session is active
; "r=" zero or more repeat times (OPTIONAL)
; "z=" time zone adjustments (OPTIONAL)
; "m=" media name and transport address
; "i=" media title (OPTIONAL)
; "c=" connection information (OPTIONAL)
; "b=" zero or more bandwidth information lines (OPTIONAL)
; "k=" encryption key (OPTIONAL)
; "a=" zero or more media attribute lines (OPTIONAL)
proto-version =
origin-field =
username =
sess-id =
sess-version =
nettype =
; Network Type
; → IANA
; IN
; → RFC 8866
–
Section 8.2.6
; TN
; → RFC 2848
–
Section 3.4.1
; ATM
; → RFC 3108
–
Section 9
; PSTN
; → RFC 7195
–
Section 8.2
addrtype =
; Address Type
; → IANA
; IP4,
IP6
; → RFC 8866
–
Section 8.2.7
; NSAP,
GWID,
E164
; → RFC 3108
–
Section 9
; E164
; → RFC 7195
–
Section 8.3
session-name-field =
information-field =
uri-field =
uri =
email-fields =
email-address =
address-and-comment =
dispname-and-address =
phone-fields =
phone-number =
phone =
connection-field =
connection-address =
unicast-address /
; → RFC 8866 – Section 5.7
global-number-digits / ;
"-"
; → RFC 7195 – Section 5.7
bandwidth-fields =
bwtype =
; Bandwidth Type
; → IANA
; "CT" Conference Total
; "AS" Application Specific
; → RFC 8866 – Section 5.8
; "RS" RTCP for Senders
; "RR" RTCP for Receivers
; → RFC 3556
–
Section 2
; "TIAS" Transport Independent Application Specific
; → RFC 3890
–
Section 6.2.2
bandwidth =
time-fields =
start-time =
stop-time =
time =
repeat-fields =
repeat-interval =
typed-time =
fixed-len-time-unit =
zone-adjustments =
key-field =
key-type =
base64 =
base64-unit =
base64-pad =
base64-char =
attribute-fields =
attribute =
att-field =
att-value =
media-descriptions =
media-field =
media =
; Media Type
; → IANA
; audio,
video,
text,
application,
message
; → RFC 8866
–
Section 8.2.1
; image
; → RFC 6466
–
Section 1
port =
proto =
; Transport Protocol, see: IANA
; RTP/AVP
; RTP/SAVP
; udp
; → RFC 8866
–
Section 8.2.2
; TCP
; → RFC 4145
–
Section 3
; TCP/RTP/AVP
; → RFC 4571
–
Section 4
; TCP/TLS
; → RFC 8122
–
Section 4
; TCP/BFCP
; TCP/TLS/BFCP
; → RFC 4583
–
Section 3
; RTP/AVPF
; → RFC 4585
–
Section 9
; TCP/MSRP
; TCP/TLS/MSRP
; → RFC 4975
–
Section 8.1
; RTP/SAVPF
; → RFC 5124
–
Section 3.1
; DCCP
; DCCP/RTP/AVP
; DCCP/RTP/SAVP
; DCCP/RTP/AVPF
; DCCP/RTP/SAVPF
; → RFC 5762
–
Section 5.1
; UDP/TLS/RTP/SAVP
; DCCP/TLS/RTP/SAVP
; UDP/TLS/RTP/SAVPF
; DCCP/TLS/RTP/SAVPF
; → RFC 5764
–
Section 9
; UDP/MBMS-FEC/RTP/AVP
; UDP/MBMS-FEC/RTP/SAVP
; UDP/MBMS-REPAIR
; → RFC 6064
–
Section 8.1
; FEC/UDP
; UDP/FEC
; → RFC 6364
–
Section 8.1
; TCP/MRCPv2
; TCP/TLS/MRCPv2
; → RFC 6787
–
Section 13.7.1
; PSTN
; → RFC 7195
–
Section 8.4
; UDP/TLS/UDPTL
; → RFC 7345
–
Section 7
; TCP/RTP/AVPF
; TCP/RTP/SAVP
; TCP/RTP/SAVPF
; TCP/DTLS/RTP/SAVP
; TCP/DTLS/RTP/SAVPF
; TCP/TLS/RTP/AVP
; TCP/TLS/RTP/AVPF
; → RFC 7850
–
Section 5
fmt =
unicast-address =
multicast-address =
IP4-address =
b1 =
IP6-address =
"::" 5( h16 ":" ) ls32 /
[ h16 ] "::" 4( h16 ":" ) ls32 /
[ *1( h16 ":" ) h16 ] "::" 3( h16 ":" ) ls32 /
[ *2( h16 ":" ) h16 ] "::" 2( h16 ":" ) ls32 /
[ *3( h16 ":" ) h16 ] "::" h16 ":" ls32 /
[ *4( h16 ":" ) h16 ] "::" ls32 /
[ *5( h16 ":" ) h16 ] "::" h16 /
[ *6( h16 ":" ) h16 ] "::"
h16 =
ls32 =
IP4-multicast =
m1 =
ttl =
IP6-multicast =
FQDN =
extn-addr =
alpha-numeric =
POS-DIGIT =
decimal-uchar =
/ POS‑DIGIT DIGIT
/ ( "1" 2*( DIGIT ) )
/ ( "2" ( "0" / "1" / "2" / "3" / "4") DIGIT )
/ ( "2" "5" ( "0" / "1" / "2" / "3" / "4" / "5" ) )
text =
; default is to interpret this as UTF8 text
; ISO 8859‑1 requires "a=charset:ISO‑8859‑1" session‑level attribute to be used
byte-string =
; any byte except NUL, CR or LF
non-ws-string =
token =
token-char =
email-safe =
; any byte except NUL, CR, LF, or the quoting characters ( ) < >
integer =
OCTET =
; 8 bits of data
CHAR =
; any 7-bit US-ASCII character,
; excluding NUL
VCHAR =
; visible (printing) characters
ALPHA =
; A‑Z / a‑z
DIGIT =
; 0-9
CTL =
; any US-ASCII control character:
; (octets 0 - 31) and DEL (127)
HTAB =
; horizontal tab
LF =
; linefeed
CR =
; carriage return
SP =
; space
DQUOTE =
; " (Double Quote)
BIT =
HEXDIG =
; Note: according to the 'char-val' rule,
; letters (A-F) are case insensitive
CRLF =
WSP =
LWSP =
