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ABNF for  Contact  SIP Header

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RFC 3261 – Section 20.10

See also:     Accept-Contact     Reject-Contact     Request-Disposition


Contact   =
( "Contact"  /  "m" )   HCOLON   ( STAR  /  ( contact-param   *( COMMA   contact-param ) ) )

contact-param   =
( name-addr  /  addr-spec )   *( SEMI   contact-params )

contact-params   =
c-p-q  /  c-p-expires  /     ;  see  RFC 3261
feature-param  /     ;  see  RFC 3840 – Section 9
c-p-reg  /  c-p-instance  /     ;  see  RFC 5626 – Section 10
temp-gruu  /  pub-gruu  /     ;  see  RFC 5627 – Section 7
temp-gruu-cookie  /     ;  see  RFC 6140 – Section 9.3
mp-param  /  rc-param  /  np-param  /     ;  see  RFC 7044 – Section 14.3
contact-extension

c-p-q   =
"q"   EQUAL   qvalue

c-p-expires   =
"expires"   EQUAL   delta-seconds

feature-param   =
enc-feature-tag   =
base-tags   =
"audio"  /  "automata"  /  "class"  /  "duplex"  /  "data"  /  "control"  /  "mobility"  /  "description"  /
"events"  /  "priority"  /  "methods"  /  "schemes"  /  "application"  /  "video"  /  "language"  /
"type"  /  "isfocus"  /  "actor"  /  "text"  /  "extensions"

other-tags   =
"+"   ftag-name

ftag-name   =
ALPHA   *( ALPHA  /  DIGIT  /  "!"  /  " ' "  /  "."  /  "-"  /  "%" )

tag-value-list   =
tag-value   *( ","   tag-value )

tag-value   =
[ "!" ]   ( token-nobang  /  boolean  /  numeric )

token-nobang   =
1*( alphanum  /  "-"  /  "."  /  "%"  /  "*"  /  "_"  /  "+"  /  "`"  /  " ' "  /  "~" )

boolean   =
"TRUE"  /  "FALSE"

numeric   =
numeric-relation   =
">="  /  "<="  /  "="  /  ( number   ":" )

number   =
[ "+"  /  "-" ]   1*DIGIT   [ "."   0*DIGIT ]

string-value   =
"<"   *( qdtext-no-abkt  /  quoted-pair )   ">"

qdtext-no-abkt   =
LWS  /  %x21  /  %x23-3B  /  %x3D  /  %x3F-5B  /  %x5D-7E  /  UTF8-NONASCII

c-p-reg   =
"reg-id"   EQUAL   1*DIGIT
;   1 to (2^31 - 1)

c-p-instance   =
"+sip.instance"   EQUAL   LDQUOT   "<"   instance-val   ">"   RDQUOT

instance-val   =
*uric

temp-gruu   =
"temp-gruu"   EQUAL   LDQUOT   *( qdtext  /  quoted-pair )   RDQUOT

pub-gruu   =
"pub-gruu"   EQUAL   LDQUOT   *( qdtext  /  quoted-pair )   RDQUOT

contact-extension   =