RFC 2806 ABNF Productions

Rule Name		Production or Comment
telephone-url	=	telephone-scheme ":" telephone-subscriber

telephone-scheme	=	"tel"

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

domain	=	<defined in [RFC1035]>

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

quoted-string	=	%x22 *( "\" CHAR / ( %x20-21 / %x23-7E / %x80-FF ) ) %x22 ; 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"

fax-url	=	fax-scheme ":" fax-subscriber

fax-scheme	=	"fax"

fax-subscriber	=	fax-global-phone / fax-local-phone

fax-global-phone	=	"+" base-phone-number [isdn-subaddress] [t33-subaddress] [post-dial] *( area-specifier / service-provider / future-extension )

fax-local-phone	=	1( phonedigit / dtmf-digit / pause-character ) [isdn-subaddress] [t33-subaddress] [post-dial] area-specifier ( area-specifier / service-provider / future-extension )

t33-subaddress	=	";tsub=" 1*phonedigit

modem-url	=	modem-scheme ":" remote-host

modem-scheme	=	"modem"

remote-host	=	telephone-subscriber *( modem-params / recommended-params )

modem-params	=	";type=" data-capabilities

recommended-params	=	";rec=" data-capabilities

data-capabilities	=	accepted-modem ["?" data-bits parity stop-bits]

accepted-modem	=	"V21" / "V22" / "V22b" / "V23" / "V26t" / "V32" / "V32b" / "V34" / "V90" / "V110" / "V120" / "B103" / "B212" / "X75" / "vnd." vendor-name "." modem-type

data-bits	=	"7" / "8"

parity	=	"n" / "e" / "o" / "m" / "s"

stop-bits	=	"1" / "2"

vendor-name	=	1*( ALPHA / DIGIT / "-" / "+" )

modem-type	=	1*( ALPHA / DIGIT / "-" / "+" )

Symbol Cross Reference List

Reference	Productions which Reference this Symbol
ALPHA	vendor-name, modem-type
CHAR	quoted-string
DIGIT	phonedigit, vendor-name, modem-type
accepted-modem	data-capabilities
area-specifier	global-phone-number, local-phone-number, local-phone-number, fax-global-phone, fax-local-phone, fax-local-phone
base-phone-number	global-phone-number, fax-global-phone
data-bits	data-capabilities
data-capabilities	modem-params, recommended-params
domain	provider-hostname
dtmf-digit	local-phone-number, post-dial, local-network-prefix, fax-local-phone
fax-global-phone	fax-subscriber
fax-local-phone	fax-subscriber
fax-scheme	fax-url
fax-subscriber	fax-url
future-extension	global-phone-number, local-phone-number, fax-global-phone, fax-local-phone
global-network-prefix	network-prefix
global-phone-number	telephone-subscriber
isdn-subaddress	global-phone-number, local-phone-number, fax-global-phone, fax-local-phone
local-network-prefix	network-prefix
local-phone-number	telephone-subscriber
modem-params	remote-host
modem-scheme	modem-url
modem-type	accepted-modem
network-prefix	phone-context-ident
one-second-pause	pause-character
parity	data-capabilities
pause-character	local-phone-number, post-dial, local-network-prefix, fax-local-phone
phone-context-ident	area-specifier
phone-context-tag	area-specifier
phonedigit	base-phone-number, local-phone-number, isdn-subaddress, post-dial, global-network-prefix, local-network-prefix, fax-local-phone, t33-subaddress
post-dial	global-phone-number, local-phone-number, fax-global-phone, fax-local-phone
private-prefix	phone-context-ident
provider-hostname	service-provider
provider-tag	service-provider
quoted-string	future-extension
recommended-params	remote-host
remote-host	modem-url
service-provider	global-phone-number, local-phone-number, fax-global-phone, fax-local-phone
stop-bits	data-capabilities
t33-subaddress	fax-global-phone, fax-local-phone
telephone-scheme	telephone-url
telephone-subscriber	telephone-url, remote-host
token-char	future-extension, future-extension, future-extension
vendor-name	accepted-modem
visual-separator	phonedigit
wait-for-dial-tone	pause-character