HTML Version of ABNF for <sip_3261.abnf>

This HTML version of ABNF is automatically generated using Jabnf. The protocol syntax is presented in ABNF according to RFC 2234 This version of ABNF is for informational purposes only. It is intended as a tool to help read the ABNF. Errors may have been introduced in translating to HTML. The original ABNF2HTML tool is implemeted by perl and provited by Inet Technologies, Inc.

This file consists of:

• ABNF Specification,
• Symbol Cross Reference Table, and,
• General Directions.

The productions for the ABNF specification are provided below.

ABNF Productions

Rule Name		Production or Comment
ALPHA	=	%x41-5A / %x61-7A   ; A-Z / a-z
CR	=	%x0D   ; carriage return
CRLF	=	CR LF   ; Internet standard newline
DIGIT	=	%x30-39   ; 0-9
DQUOTE	=	%x22   ; " (Double Quote)
HEXDIG	=	DIGIT / "A" / "B" / "C" / "D" / "E" / "F"
HTAB	=	%x09   ; horizontal tab
LF	=	%x0A   ; linefeed
OCTET	=	%x00-FF   ; 8 bits of data
SP	=	%x20   ; space
WSP	=	SP / HTAB
alphanum	=	ALPHA / DIGIT
reserved	=	";" / "/" / "?" / ":" / "@" / "&" / "=" / "+" / "$" / ","
unreserved	=	alphanum / mark
mark	=	"-" / "_" / "." / "!" / "~" / "*" / "'" / "(" / ")"
escaped	=	"%" HEXDIG HEXDIG
LWS	=	[*WSP CRLF] 1*WSP   ; linear whitespace
SWS	=	[LWS]   ; sep whitespace
HCOLON	=	*(SP / HTAB) ":" SWS
TEXT-UTF8-TRIM	=	1*TEXT-UTF8char *(*LWS TEXT-UTF8char)
TEXT-UTF8char	=	%x21-7E / UTF8-NONASCII
UTF8-NONASCII	=	%xC0-DF 1UTF8-CONT / %xE0-EF 2UTF8-CONT / %xF0-F7 3UTF8-CONT / %xF8-Fb 4UTF8-CONT / %xFC-FD 5UTF8-CONT
UTF8-CONT	=	%x80-BF
LHEX	=	DIGIT / %x61-66   ;lowercase a-f
token	=	1*(alphanum / "-" / "." / "!" / "%" / "*" / "_" / "+" / "`" / "'" / "~")
word	=	1*(alphanum / "-" / "." / "!" / "%" / "*" / "_" / "+" / "`" / "'" / "~" / "(" / ")" / "<" / ">" / ":" / "\" / DQUOTE / "/" / "[" / "]" / "?" / "{" / "}")
STAR	=	SWS "*" SWS   ; asterisk
SLASH	=	SWS "/" SWS   ; slash
EQUAL	=	SWS "=" SWS   ; equal
LPAREN	=	SWS "(" SWS   ; left parenthesis
RPAREN	=	SWS ")" SWS   ; right parenthesis
RAQUOT	=	">" SWS   ; right angle quote
LAQUOT	=	SWS "<"   ; left angle quote
COMMA	=	SWS "," SWS   ; comma
SEMI	=	SWS ";" SWS   ; semicolon
COLON	=	SWS ":" SWS   ; colon
LDQUOT	=	SWS DQUOTE   ; open double quotation mark
RDQUOT	=	DQUOTE SWS   ; close double quotation mark
comment	=	LPAREN *(ctext / quoted-pair / comment) RPAREN
ctext	=	%x21-27 / %x2A-5B / %x5D-7E / UTF8-NONASCII / LWS
quoted-string	=	SWS DQUOTE *(qdtext / quoted-pair) DQUOTE
qdtext	=	LWS / %x21 / %x23-5B / %x5D-7E / UTF8-NONASCII
quoted-pair	=	"\" (%x00-09 / %x0B-0C / %x0E-7F)
SIP-URI	=	"sip:" [userinfo] hostport uri-parameters [headers]
SIPS-URI	=	"sips:" [userinfo] hostport uri-parameters [headers]
userinfo	=	(user / telephone-subscriber) [":" password] "@"
user	=	1*(unreserved / escaped / user-unreserved)
user-unreserved	=	"&" / "=" / "+" / "$" / "," / ";" / "?" / "/"
password	=	*(unreserved / escaped / "&" / "=" / "+" / "$" / ",")
hostport	=	host [":" port]
host	=	hostname / IPv4address / IPv6reference
hostname	=	*(domainlabel ".") toplabel ["."]
domainlabel	=	alphanum / alphanum *(alphanum / "-") alphanum
toplabel	=	ALPHA / ALPHA *(alphanum / "-") alphanum
IPv4address	=	1*3DIGIT "." 1*3DIGIT "." 1*3DIGIT "." 1*3DIGIT
IPv6reference	=	"[" IPv6address "]"
IPv6address	=	hexpart [":" IPv4address]
hexpart	=	hexseq / hexseq "::" [hexseq] / "::" [hexseq]
hexseq	=	hex4 *(":" hex4)
hex4	=	1*4HEXDIG
port	=	1*DIGIT
uri-parameters	=	*(";" uri-parameter)
uri-parameter	=	transport-param / user-param / method-param / ttl-param / maddr-param / lr-param / other-param
transport-param	=	"transport=" ("udp" / "tcp" / "sctp" / "tls" / other-transport)
other-transport	=	token
user-param	=	"user=" ("phone" / "ip" / other-user)
other-user	=	token
method-param	=	"method=" Method
ttl-param	=	"ttl=" ttl
maddr-param	=	"maddr=" host
lr-param	=	"lr"
other-param	=	pname ["=" pvalue]
pname	=	1*paramchar
pvalue	=	1*paramchar
paramchar	=	param-unreserved / unreserved / escaped
param-unreserved	=	"[" / "]" / "/" / ":" / "&" / "+" / "$"
headers	=	"?" header *("&" header)
header	=	hname "=" hvalue
hname	=	1*(hnv-unreserved / unreserved / escaped)
hvalue	=	*(hnv-unreserved / unreserved / escaped)
hnv-unreserved	=	"[" / "]" / "/" / "?" / ":" / "+" / "$"
SIP-message	=	Request / Response
Request	=	Request-Line *(message-header) CRLF [message-body]
Request-Line	=	Method SP Request-URI SP SIP-Version CRLF
Request-URI	=	SIP-URI / SIPS-URI / absoluteURI
absoluteURI	=	scheme ":" (hier-part / opaque-part)
hier-part	=	(net-path / abs-path) ["?" query]
net-path	=	"//" authority [abs-path]
abs-path	=	"/" path-segments
opaque-part	=	uric-no-slash *uric
uric	=	reserved / unreserved / escaped
uric-no-slash	=	unreserved / escaped / ";" / "?" / ":" / "@" / "&" / "=" / "+" / "$" / ","
path-segments	=	segment *("/" segment)
segment	=	*pchar *(";" param)
param	=	*pchar
pchar	=	unreserved / escaped / ":" / "@" / "&" / "=" / "+" / "$" / ","
scheme	=	ALPHA *(ALPHA / DIGIT / "+" / "-" / ".")
authority	=	srvr / reg-name
srvr	=	[[userinfo "@"] hostport]
reg-name	=	1*(unreserved / escaped / "$" / "," / ";" / ":" / "@" / "&" / "=" / "+")
query	=	*uric
SIP-Version	=	"SIP" "/" 1*DIGIT "." 1*DIGIT
message-header	=	(Accept / Accept-Encoding / Accept-Language / Alert-Info / Allow / Authentication-Info / Authorization / Call-ID / Call-Info / Contact / Content-Disposition / Content-Encoding / Content-Language / Content-Length / Content-Type / CSeq / Date / Error-Info / Expires / From / In-Reply-To / Max-Forwards / MIME-Version / Min-Expires / Organization / Priority / Proxy-Authenticate / Proxy-Authorization / Proxy-Require / Record-Route / Reply-To / Require / Retry-After / Route / Server / Subject / Supported / Timestamp / To / Unsupported / User-Agent / Via / Warning / WWW-Authenticate / extension-header) CRLF
INVITEm	=	%x49.4E.56.49.54.45   ; INVITE in caps
ACKm	=	%x41.43.4B   ; ACK in caps
OPTIONSm	=	%x4F.50.54.49.4F.4E.53   ; OPTIONS in caps
BYEm	=	%x42.59.45   ; BYE in caps
CANCELm	=	%x43.41.4E.43.45.4C   ; CANCEL in caps
REGISTERm	=	%x52.45.47.49.53.54.45.52   ; REGISTER in caps
Method	=	INVITEm / ACKm / OPTIONSm / BYEm / CANCELm / REGISTERm / extension-method
extension-method	=	token
Response	=	Status-Line *(message-header) CRLF [message-body]
Status-Line	=	SIP-Version SP Status-Code SP Reason-Phrase CRLF
Status-Code	=	Informational / Redirection / Success / Client-Error / Server-Error / Global-Failure / extension-code
extension-code	=	3DIGIT
Reason-Phrase	=	*(reserved / unreserved / escaped / UTF8-NONASCII / UTF8-CONT / SP / HTAB)
Informational	=	"100"   ; Trying / "180"   ; Ringing / "181"   ; Call Is Being Forwarded / "182"   ; Queued / "183"   ; Session Progress
Success	=	"200"   ; OK
Redirection	=	"300"   ; Multiple Choices / "301"   ; Moved Permanently / "302"   ; Moved Temporarily / "305"   ; Use Proxy / "380"   ; Alternative Service
Client-Error	=	"400"   ; Bad Request / "401"   ; Unauthorized / "402"   ; Payment Required / "403"   ; Forbidden / "404"   ; Not Found / "405"   ; Method Not Allowed / "406"   ; Not Acceptable / "407"   ; Proxy Authentication Required / "408"   ; Request Timeout / "410"   ; Gone / "413"   ; Request Entity Too Large / "414"   ; Request-URI Too Large / "415"   ; Unsupported Media Type / "416"   ; Unsupported URI Scheme / "420"   ; Bad Extension / "421"   ; Extension Required / "423"   ; Interval Too Brief / "480"   ; Temporarily not available / "481"   ; Call Leg/Transaction Does Not Exist / "482"   ; Loop Detected / "483"   ; Too Many Hops / "484"   ; Address Incomplete / "485"   ; Ambiguous / "486"   ; Busy Here / "487"   ; Request Terminated / "488"   ; Not Acceptable Here / "491"   ; Request Pending / "493"   ; Undecipherable
Server-Error	=	"500"   ; Internal Server Error / "501"   ; Not Implemented / "502"   ; Bad Gateway / "503"   ; Service Unavailable / "504"   ; Server Time-out / "505"   ; SIP Version not supported / "513"   ; Message Too Large
Global-Failure	=	"600"   ; Busy Everywhere / "603"   ; Decline / "604"   ; Does not exist anywhere / "606"   ; Not Acceptable
Accept	=	"Accept" HCOLON [accept-range *(COMMA accept-range)]
accept-range	=	media-range *(SEMI accept-param)
media-range	=	("*/*" / (m-type SLASH "*") / (m-type SLASH m-subtype)) *(SEMI m-parameter)
accept-param	=	("q" EQUAL qvalue) / generic-param
qvalue	=	("0" ["." 0*3DIGIT]) / ("1" ["." 0*3("0")])
generic-param	=	token [EQUAL gen-value]
gen-value	=	token / host / quoted-string
Accept-Encoding	=	"Accept-Encoding" HCOLON [encoding *(COMMA encoding)]
encoding	=	codings *(SEMI accept-param)
codings	=	content-coding / "*"
content-coding	=	token
Accept-Language	=	"Accept-Language" HCOLON [language *(COMMA language)]
language	=	language-range *(SEMI accept-param)
language-range	=	((1*8ALPHA *("-" 1*8ALPHA)) / "*")
Alert-Info	=	"Alert-Info" HCOLON alert-param *(COMMA alert-param)
alert-param	=	LAQUOT absoluteURI RAQUOT *(SEMI generic-param)
Allow	=	"Allow" HCOLON [Method *(COMMA Method)]
Authorization	=	"Authorization" HCOLON credentials
credentials	=	("Digest" LWS digest-response) / other-response
digest-response	=	dig-resp *(COMMA dig-resp)
dig-resp	=	username / realm / nonce / digest-uri / dresponse / algorithm / cnonce / opaque / message-qop / nonce-count / auth-param
username	=	"username" EQUAL username-value
username-value	=	quoted-string
digest-uri	=	"uri" EQUAL LDQUOT digest-uri-value RDQUOT
digest-uri-value	=	Request-URI   ; Equal to request-uri as specified by HTTP/1.1
message-qop	=	"qop" EQUAL qop-value
cnonce	=	"cnonce" EQUAL cnonce-value
cnonce-value	=	nonce-value
nonce-count	=	"nc" EQUAL nc-value
nc-value	=	8LHEX
dresponse	=	"response" EQUAL request-digest
request-digest	=	LDQUOT 32LHEX RDQUOT
auth-param	=	auth-param-name EQUAL (token / quoted-string)
auth-param-name	=	token
other-response	=	auth-scheme LWS auth-param *(COMMA auth-param)
auth-scheme	=	token
Authentication-Info	=	"Authentication-Info" HCOLON ainfo *(COMMA ainfo)
ainfo	=	nextnonce / message-qop / response-auth / cnonce / nonce-count
nextnonce	=	"nextnonce" EQUAL nonce-value
response-auth	=	"rspauth" EQUAL response-digest
response-digest	=	LDQUOT *LHEX RDQUOT
Call-ID	=	("Call-ID" / "i") HCOLON callid
callid	=	word ["@" word]
Call-Info	=	"Call-Info" HCOLON info *(COMMA info)
info	=	LAQUOT absoluteURI RAQUOT *(SEMI info-param)
info-param	=	("purpose" EQUAL ("icon" / "info" / "card" / token)) / generic-param
Contact	=	("Contact" / "m") HCOLON (STAR / (contact-param *(COMMA contact-param)))
contact-param	=	(name-addr / addr-spec) *(SEMI contact-params)
name-addr	=	[display-name] LAQUOT addr-spec RAQUOT
addr-spec	=	SIP-URI / SIPS-URI / absoluteURI
display-name	=	*(token LWS) / quoted-string
contact-params	=	c-p-q / c-p-expires / contact-extension
c-p-q	=	"q" EQUAL qvalue
c-p-expires	=	"expires" EQUAL delta-seconds
contact-extension	=	generic-param
delta-seconds	=	1*DIGIT
Content-Disposition	=	"Content-Disposition" HCOLON disp-type *(SEMI disp-param)
disp-type	=	"render" / "session" / "icon" / "alert" / disp-extension-token
disp-param	=	handling-param / generic-param
handling-param	=	"handling" EQUAL ("optional" / "required" / other-handling)
other-handling	=	token
disp-extension-token	=	token
Content-Encoding	=	("Content-Encoding" / "e") HCOLON content-coding *(COMMA content-coding)
Content-Language	=	"Content-Language" HCOLON language-tag *(COMMA language-tag)
language-tag	=	primary-tag *("-" subtag)
primary-tag	=	1*8ALPHA
subtag	=	1*8ALPHA
Content-Length	=	("Content-Length" / "l") HCOLON 1*DIGIT
Content-Type	=	("Content-Type" / "c") HCOLON media-type
media-type	=	m-type SLASH m-subtype *(SEMI m-parameter)
m-type	=	discrete-type / composite-type
discrete-type	=	"text" / "image" / "audio" / "video" / "application" / extension-token
composite-type	=	"message" / "multipart" / extension-token
extension-token	=	ietf-token / x-token
ietf-token	=	token
x-token	=	"x-" token
m-subtype	=	extension-token / iana-token
iana-token	=	token
m-parameter	=	m-attribute EQUAL m-value
m-attribute	=	token
m-value	=	token / quoted-string
CSeq	=	"CSeq" HCOLON 1*DIGIT LWS Method
Date	=	"Date" HCOLON SIP-date
SIP-date	=	rfc1123-date
rfc1123-date	=	wkday "," SP date1 SP time SP "GMT"
date1	=	2DIGIT SP month SP 4DIGIT   ; day month year (e.g., 02 Jun 1982)
time	=	2DIGIT ":" 2DIGIT ":" 2DIGIT   ; 00:00:00 - 23:59:59
wkday	=	"Mon" / "Tue" / "Wed" / "Thu" / "Fri" / "Sat" / "Sun"
month	=	"Jan" / "Feb" / "Mar" / "Apr" / "May" / "Jun" / "Jul" / "Aug" / "Sep" / "Oct" / "Nov" / "Dec"
Error-Info	=	"Error-Info" HCOLON error-uri *(COMMA error-uri)
error-uri	=	LAQUOT absoluteURI RAQUOT *(SEMI generic-param)
Expires	=	"Expires" HCOLON delta-seconds
From	=	("From" / "f") HCOLON from-spec
from-spec	=	(name-addr / addr-spec) *(SEMI from-param)
from-param	=	tag-param / generic-param
tag-param	=	"tag" EQUAL token
In-Reply-To	=	"In-Reply-To" HCOLON callid *(COMMA callid)
Max-Forwards	=	"Max-Forwards" HCOLON 1*DIGIT
MIME-Version	=	"MIME-Version" HCOLON 1*DIGIT "." 1*DIGIT
Min-Expires	=	"Min-Expires" HCOLON delta-seconds
Organization	=	"Organization" HCOLON [TEXT-UTF8-TRIM]
Priority	=	"Priority" HCOLON priority-value
priority-value	=	"emergency" / "urgent" / "normal" / "non-urgent" / other-priority
other-priority	=	token
Proxy-Authenticate	=	"Proxy-Authenticate" HCOLON challenge
challenge	=	("Digest" LWS digest-cln *(COMMA digest-cln)) / other-challenge
other-challenge	=	auth-scheme LWS auth-param *(COMMA auth-param)
digest-cln	=	realm / domain / nonce / opaque / stale / algorithm / qop-options / auth-param
realm	=	"realm" EQUAL realm-value
realm-value	=	quoted-string
domain	=	"domain" EQUAL LDQUOT URI *(1*SP URI) RDQUOT
URI	=	absoluteURI / abs-path
nonce	=	"nonce" EQUAL nonce-value
nonce-value	=	quoted-string
opaque	=	"opaque" EQUAL quoted-string
stale	=	"stale" EQUAL ("true" / "false")
algorithm	=	"algorithm" EQUAL ("MD5" / "MD5-sess" / token)
qop-options	=	"qop" EQUAL LDQUOT qop-value *("," qop-value) RDQUOT
qop-value	=	"auth" / "auth-int" / token
Proxy-Authorization	=	"Proxy-Authorization" HCOLON credentials
Proxy-Require	=	"Proxy-Require" HCOLON option-tag *(COMMA option-tag)
option-tag	=	token
Record-Route	=	"Record-Route" HCOLON rec-route *(COMMA rec-route)
rec-route	=	name-addr *(SEMI rr-param)
rr-param	=	generic-param
Reply-To	=	"Reply-To" HCOLON rplyto-spec
rplyto-spec	=	(name-addr / addr-spec) *(SEMI rplyto-param)
rplyto-param	=	generic-param
Require	=	"Require" HCOLON option-tag *(COMMA option-tag)
Retry-After	=	"Retry-After" HCOLON delta-seconds [comment] *(SEMI retry-param)
retry-param	=	("duration" EQUAL delta-seconds) / generic-param
Route	=	"Route" HCOLON route-param *(COMMA route-param)
route-param	=	name-addr *(SEMI rr-param)
Server	=	"Server" HCOLON server-val *(LWS server-val)
server-val	=	product / comment
product	=	token [SLASH product-version]
product-version	=	token
Subject	=	("Subject" / "s") HCOLON [TEXT-UTF8-TRIM]
Supported	=	("Supported" / "k") HCOLON [option-tag *(COMMA option-tag)]
Timestamp	=	"Timestamp" HCOLON 1*(DIGIT) ["." *(DIGIT)] [LWS delay]
delay	=	*(DIGIT) ["." *(DIGIT)]
To	=	("To" / "t") HCOLON (name-addr / addr-spec) *(SEMI to-param)
to-param	=	tag-param / generic-param
Unsupported	=	"Unsupported" HCOLON option-tag *(COMMA option-tag)
User-Agent	=	"User-Agent" HCOLON server-val *(LWS server-val)
Via	=	("Via" / "v") HCOLON via-parm *(COMMA via-parm)
via-parm	=	sent-protocol LWS sent-by *(SEMI via-params)
via-params	=	via-ttl / via-maddr / via-received / via-branch / via-extension
via-ttl	=	"ttl" EQUAL ttl
via-maddr	=	"maddr" EQUAL host
via-received	=	"received" EQUAL (IPv4address / IPv6address)
via-branch	=	"branch" EQUAL token
via-extension	=	generic-param
sent-protocol	=	protocol-name SLASH protocol-version SLASH transport
protocol-name	=	"SIP" / token
protocol-version	=	token
transport	=	"UDP" / "TCP" / "TLS" / "SCTP" / other-transport
sent-by	=	host [COLON port]
ttl	=	1*3DIGIT   ; 0 to 255
Warning	=	"Warning" HCOLON warning-value *(COMMA warning-value)
warning-value	=	warn-code SP warn-agent SP warn-text
warn-code	=	3DIGIT
warn-agent	=	hostport / pseudonym   ; the name or pseudonym of the server adding    ; the Warning header, for use in debugging
warn-text	=	quoted-string
pseudonym	=	token
WWW-Authenticate	=	"WWW-Authenticate" HCOLON challenge
extension-header	=	header-name HCOLON header-value
header-name	=	token
header-value	=	*(TEXT-UTF8char / UTF8-CONT / LWS)
message-body	=	*OCTET   ;;;;;;;;;;;;;;;;;;;    ; from RFC2806    ;;;;;;;;;;;;;;;;;;;
telephone-subscriber	=	global-phone-number / local-phone-number
global-phone-number	=	"+" base-phone-number [isdn-subaddress] [post-dial] *(area-specifier / service-provider / future-extension)
base-phone-number	=	1*phonedigit
local-phone-number	=	1*(phonedigit / dtmf-digit / pause-character) [isdn-subaddress] [post-dial] area-specifier *(area-specifier / service-provider / future-extension)
isdn-subaddress	=	";isub=" 1*phonedigit
post-dial	=	";postd=" 1*(phonedigit / dtmf-digit / pause-character)
area-specifier	=	";" phone-context-tag "=" phone-context-ident
phone-context-tag	=	"phone-context"
phone-context-ident	=	network-prefix / private-prefix
network-prefix	=	global-network-prefix / local-network-prefix
global-network-prefix	=	"+" 1*phonedigit
local-network-prefix	=	1*(phonedigit / dtmf-digit / pause-character)
private-prefix	=	(%x21-22 / %x24-27 / %x2C / %x2F / %x3A / %x3C-40 / %x45-4F / %x51-56 / %x58-60 / %x65-6F / %x71-76 / %x78-7E) *(%x21-3A / %x3C-7E)   ; Characters in URLs must follow escaping rules    ; as explained in [RFC2396]    ; See sections 1.2 and 2.5.2
service-provider	=	";" provider-tag "=" provider-hostname
provider-tag	=	"tsp"
provider-hostname	=	domain   ; is defined in [RFC1035]    ; See section 2.5.10
future-extension	=	";" 1*(token-char) ["=" ((1*(token-char) ["?" 1*(token-char)]) / quoted-string)]   ; See section 2.5.11 and [RFC2543]
token-char	=	(%x21 / %x23-27 / %x2A-2B / %x2D-2E / %x30-39 / %x41-5A / %x5E-7A / %x7C / %x7E)   ; Characters in URLs must follow escaping rules    ; as explained in [RFC2396]    ; See sections 1.2 and 2.5.11
phonedigit	=	DIGIT / visual-separator
visual-separator	=	"-" / "." / "(" / ")"
pause-character	=	one-second-pause / wait-for-dial-tone
one-second-pause	=	"p"
wait-for-dial-tone	=	"w"
dtmf-digit	=	"*" / "#" / "A" / "B" / "C" / "D"   ;;;;;;;;;;;;;;;;;;;    ; RFC2806 End    ;;;;;;;;;;;;;;;;;;;

Symbol Cross Reference List

Following is a cross-reference list for the ABNF.On the left are references to productions, on the right are links to the rules in which those productions are referenced.

Symbol Cross-Reference Table

Reference	Productions which Reference this Symbol
ALPHA	alphanum, toplabel, toplabel, scheme, scheme, language-range, language-range, primary-tag, subtag
CR	CRLF
CRLF	LWS, Request, Request-Line, message-header, Response, Status-Line
DIGIT	HEXDIG, alphanum, LHEX, IPv4address, IPv4address, IPv4address, IPv4address, port, scheme, SIP-Version, SIP-Version, extension-code, qvalue, delta-seconds, Content-Length, CSeq, date1, date1, time, time, time, Max-Forwards, MIME-Version, MIME-Version, Timestamp, Timestamp, delay, delay, ttl, warn-code, phonedigit
DQUOTE	word, LDQUOT, RDQUOT, quoted-string, quoted-string
HEXDIG	escaped, escaped, hex4
HTAB	WSP, HCOLON, Reason-Phrase
LF	CRLF
OCTET	message-body
SP	WSP, HCOLON, Request-Line, Request-Line, Status-Line, Status-Line, Reason-Phrase, rfc1123-date, rfc1123-date, rfc1123-date, date1, date1, domain, warning-value, warning-value
WSP	LWS, LWS
alphanum	unreserved, token, word, domainlabel, domainlabel, domainlabel, domainlabel, toplabel, toplabel
reserved	uric, Reason-Phrase
unreserved	user, password, paramchar, hname, hvalue, uric, uric-no-slash, pchar, reg-name, Reason-Phrase
mark	unreserved
escaped	user, password, paramchar, hname, hvalue, uric, uric-no-slash, pchar, reg-name, Reason-Phrase
LWS	SWS, TEXT-UTF8-TRIM, ctext, qdtext, credentials, other-response, display-name, CSeq, challenge, other-challenge, Server, Timestamp, User-Agent, via-parm, header-value
SWS	HCOLON, STAR, STAR, SLASH, SLASH, EQUAL, EQUAL, LPAREN, LPAREN, RPAREN, RPAREN, RAQUOT, LAQUOT, COMMA, COMMA, SEMI, SEMI, COLON, COLON, LDQUOT, RDQUOT, quoted-string
HCOLON	Accept, Accept-Encoding, Accept-Language, Alert-Info, Allow, Authorization, Authentication-Info, Call-ID, Call-Info, Contact, Content-Disposition, Content-Encoding, Content-Language, Content-Length, Content-Type, CSeq, Date, Error-Info, Expires, From, In-Reply-To, Max-Forwards, MIME-Version, Min-Expires, Organization, Priority, Proxy-Authenticate, Proxy-Authorization, Proxy-Require, Record-Route, Reply-To, Require, Retry-After, Route, Server, Subject, Supported, Timestamp, To, Unsupported, User-Agent, Via, Warning, WWW-Authenticate, extension-header
TEXT-UTF8-TRIM	Organization, Subject
TEXT-UTF8char	TEXT-UTF8-TRIM, TEXT-UTF8-TRIM, header-value
UTF8-NONASCII	TEXT-UTF8char, ctext, qdtext, Reason-Phrase
UTF8-CONT	UTF8-NONASCII, UTF8-NONASCII, UTF8-NONASCII, UTF8-NONASCII, UTF8-NONASCII, Reason-Phrase, header-value
LHEX	nc-value, request-digest, response-digest
token	other-transport, other-user, extension-method, generic-param, gen-value, content-coding, auth-param, auth-param-name, auth-scheme, info-param, display-name, other-handling, disp-extension-token, ietf-token, x-token, iana-token, m-attribute, m-value, tag-param, other-priority, algorithm, qop-value, option-tag, product, product-version, via-branch, protocol-name, protocol-version, pseudonym, header-name
word	callid, callid
STAR	Contact
SLASH	media-range, media-range, media-type, product, sent-protocol, sent-protocol
EQUAL	accept-param, generic-param, username, digest-uri, message-qop, cnonce, nonce-count, dresponse, auth-param, nextnonce, response-auth, info-param, c-p-q, c-p-expires, handling-param, m-parameter, tag-param, realm, domain, nonce, opaque, stale, algorithm, qop-options, retry-param, via-ttl, via-maddr, via-received, via-branch
LPAREN	comment
RPAREN	comment
RAQUOT	alert-param, info, name-addr, error-uri
LAQUOT	alert-param, info, name-addr, error-uri
COMMA	Accept, Accept-Encoding, Accept-Language, Alert-Info, Allow, digest-response, other-response, Authentication-Info, Call-Info, Contact, Content-Encoding, Content-Language, Error-Info, In-Reply-To, challenge, other-challenge, Proxy-Require, Record-Route, Require, Route, Supported, Unsupported, Via, Warning
SEMI	accept-range, media-range, encoding, language, alert-param, info, contact-param, Content-Disposition, media-type, error-uri, from-spec, rec-route, rplyto-spec, Retry-After, route-param, To, via-parm
COLON	sent-by
LDQUOT	digest-uri, request-digest, response-digest, domain, qop-options
RDQUOT	digest-uri, request-digest, response-digest, domain, qop-options
comment	comment, Retry-After, server-val
ctext	comment
quoted-string	gen-value, username-value, auth-param, display-name, m-value, realm-value, nonce-value, opaque, warn-text, future-extension
qdtext	quoted-string
quoted-pair	comment, quoted-string
SIP-URI	Request-URI, addr-spec
SIPS-URI	Request-URI, addr-spec
userinfo	SIP-URI, SIPS-URI, srvr
user	userinfo
user-unreserved	user
password	userinfo
hostport	SIP-URI, SIPS-URI, srvr, warn-agent
host	hostport, maddr-param, gen-value, via-maddr, sent-by
hostname	host
domainlabel	hostname
toplabel	hostname
IPv4address	host, IPv6address, via-received
IPv6reference	host
IPv6address	IPv6reference, via-received
hexpart	IPv6address
hexseq	hexpart, hexpart, hexpart, hexpart
hex4	hexseq, hexseq
port	hostport, sent-by
uri-parameters	SIP-URI, SIPS-URI
uri-parameter	uri-parameters
transport-param	uri-parameter
other-transport	transport-param, transport
user-param	uri-parameter
other-user	user-param
method-param	uri-parameter
ttl-param	uri-parameter
maddr-param	uri-parameter
lr-param	uri-parameter
other-param	uri-parameter
pname	other-param
pvalue	other-param
paramchar	pname, pvalue
param-unreserved	paramchar
headers	SIP-URI, SIPS-URI
header	headers, headers
hname	header
hvalue	header
hnv-unreserved	hname, hvalue
Request	SIP-message
Request-Line	Request
Request-URI	Request-Line, digest-uri-value
absoluteURI	Request-URI, alert-param, info, addr-spec, error-uri, URI
hier-part	absoluteURI
net-path	hier-part
abs-path	hier-part, net-path, URI
opaque-part	absoluteURI
uric	opaque-part, query
uric-no-slash	opaque-part
path-segments	abs-path
segment	path-segments, path-segments
param	segment
pchar	segment, param
scheme	absoluteURI
authority	net-path
srvr	authority
reg-name	authority
query	hier-part
SIP-Version	Request-Line, Status-Line
message-header	Request, Response
INVITEm	Method
ACKm	Method
OPTIONSm	Method
BYEm	Method
CANCELm	Method
REGISTERm	Method
Method	method-param, Request-Line, Allow, Allow, CSeq
extension-method	Method
Response	SIP-message
Status-Line	Response
Status-Code	Status-Line
extension-code	Status-Code
Reason-Phrase	Status-Line
Informational	Status-Code
Success	Status-Code
Redirection	Status-Code
Client-Error	Status-Code
Server-Error	Status-Code
Global-Failure	Status-Code
Accept	message-header
accept-range	Accept, Accept
media-range	accept-range
accept-param	accept-range, encoding, language
qvalue	accept-param, c-p-q
generic-param	accept-param, alert-param, info-param, contact-extension, disp-param, error-uri, from-param, rr-param, rplyto-param, retry-param, to-param, via-extension
gen-value	generic-param
Accept-Encoding	message-header
encoding	Accept-Encoding, Accept-Encoding
codings	encoding
content-coding	codings, Content-Encoding, Content-Encoding
Accept-Language	message-header
language	Accept-Language, Accept-Language
language-range	language
Alert-Info	message-header
alert-param	Alert-Info, Alert-Info
Allow	message-header
Authorization	message-header
credentials	Authorization, Proxy-Authorization
digest-response	credentials
dig-resp	digest-response, digest-response
username	dig-resp
username-value	username
digest-uri	dig-resp
digest-uri-value	digest-uri
message-qop	dig-resp, ainfo
cnonce	dig-resp, ainfo
cnonce-value	cnonce
nonce-count	dig-resp, ainfo
nc-value	nonce-count
dresponse	dig-resp
request-digest	dresponse
auth-param	dig-resp, other-response, other-response, other-challenge, other-challenge, digest-cln
auth-param-name	auth-param
other-response	credentials
auth-scheme	other-response, other-challenge
Authentication-Info	message-header
ainfo	Authentication-Info, Authentication-Info
nextnonce	ainfo
response-auth	ainfo
response-digest	response-auth
Call-ID	message-header
callid	Call-ID, In-Reply-To, In-Reply-To
Call-Info	message-header
info	Call-Info, Call-Info
info-param	info
Contact	message-header
contact-param	Contact, Contact
name-addr	contact-param, from-spec, rec-route, rplyto-spec, route-param, To
addr-spec	contact-param, name-addr, from-spec, rplyto-spec, To
display-name	name-addr
contact-params	contact-param
c-p-q	contact-params
c-p-expires	contact-params
contact-extension	contact-params
delta-seconds	c-p-expires, Expires, Min-Expires, Retry-After, retry-param
Content-Disposition	message-header
disp-type	Content-Disposition
disp-param	Content-Disposition
handling-param	disp-param
other-handling	handling-param
disp-extension-token	disp-type
Content-Encoding	message-header
Content-Language	message-header
language-tag	Content-Language, Content-Language
primary-tag	language-tag
subtag	language-tag
Content-Length	message-header
Content-Type	message-header
media-type	Content-Type