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ABNF for  UUI  SIP Header

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RFC 7433 – Section 4.1

 


UUI   =
"User-to-User"   HCOLON   uui-value   *( COMMA   uui-value )

uui-value   =
uui-data   *( SEMI   uui-param )

uui-param   =
uui-data   =
pkg-param   =
"purpose"   EQUAL   pkg-param-value

pkg-param-value   =
"isdn-uui"  /     ;  see  RFC 7434 – Section 11
token

cont-param   =
"content"   EQUAL   cont-param-value

cont-param-value   =
"isdn-uui"  /     ;  see  RFC 7434 – Section 11
token

enc-param   =
"encoding"   EQUAL   enc-param-value

enc-param-value   =
token  /  "hex"