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ABNF for SIP
RFC 3261and subsequent RFCs

SIP-URI   userinfo   hostport   uri‑parameters   headers   absoluteURI   tel‑URI

telephone-uri

RFC 3966Section 3  —  IANA  (RFC 5341)

telephone-uri =
"tel:"  telephone‑subscriber

; examples:
;   tel:+1-201-555-0123
;   tel:7042;phone-context=example.com
;   tel:863-1234;phone-context=+1-914-555

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telephone-subscriber =
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global-number =
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global-number-digits =
"+"  *phonedigitDIGIT  *phonedigit
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phonedigit =
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local-number =
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local-number-digits =
*phonedigit-hex  ( HEXDIG /  "*" /  "#" )  *phonedigit‑hex
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phonedigit-hex =
HEXDIG /  "*" /  "#" /  [ visual‑separator ]
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context =
";phone-context="  descriptor
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descriptor =
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domainname =
*( domainlabel  "." )  toplabel  [ "." ]
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domainlabel =
alphanum /  alphanum  *( alphanum /  "-" )  alphanum
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toplabel =
ALPHA /  ALPHA  *( alphanum /  "-" )  alphanum
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par =
parameter /  extension /  isdn‑subaddress /  ; see   RFC 3966
rn /  cic /  npdi /  ; see  RFC 4694Section 4
isub‑encoding /  ; see  RFC 4715Section 5
enum‑dip‑indicator /  ; see  RFC 4759Section 3
trunk‑group /  trunk‑context /  ; see  RFC 4904Section 5
premrate /  ; see  3GPP TS 24.229Section 7.2A.17
verstat  ; see  3GPP TS 24.229Section 7.2A.20
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parameter =
";"  pname  [ "="  pvalue ]
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pname =
1*( alphanum /  "-" )
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pvalue =
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paramchar =
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param-unreserved =
"[" /  "]" /  "/" /  ":" /  "&" /  "+" /  "$"
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extension =
";ext="  1*phonedigit
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isdn-subaddress =
";isub="  1*uric
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uric =
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rn =
";rn="  ( global‑rn /  local‑rn )
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cic =
";cic="  ( global-cic /  local‑cic )
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npdi =
";npdi"
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global-rn =
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local-rn =
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rn-context =
";rn-context="  rn‑descriptor
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rn-descriptor =
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global-hex-digits =
"+"  1*3( DIGIT )  *hex‑phonedigit
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hex-phonedigit =
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global-cic =
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local-cic =
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cic-context =
";cic-context="  rn‑descriptor
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isub-encoding =
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isub-encoding-tag =
"isub-encoding"
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isub-encoding-value =
"nsap-ia5" /  "nsap-bcd" /  "nsap" /  token
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enum-dip-indicator =
";enumdi"
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trunk-group =
";tgrp="  trunk‑group‑label
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trunk-context =
";trunk-context="  descriptor
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trunk-group-label =
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trunk-group-unreserved =
"/" /  "&" /  "+" /  "$"
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pct-encoded =
"%"  HEXDIGHEXDIG
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premrate =
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premrate-tag =
"premium-rate"
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premrate-value =
"information" /  "entertainment"
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verstat =
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verstat-tag =
"verstat"
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verstat-value =
"TN‑Validation‑Passed" /  "TN‑Validation‑Failed" /  "No‑TN‑Validation" /  other‑value
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other-value =
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visual-separator =
"-" /  "." /  "(" /  ")"
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