Message-Waiting-Indication-Operations {itu-t recommendation h 450 7 version1(0)
  message-waiting-operations(0)} DEFINITIONS AUTOMATIC TAGS ::=
BEGIN

IMPORTS
  OPERATION, ERROR
    FROM Remote-Operations-Information-Objects {joint-iso-itu-t
      remote-operations(4) informationObjects(5) version1(0)}
  EXTENSION, Extension{}
    FROM Manufacturer-specific-service-extension-definition {itu-t
      recommendation h 450 1 version1(0) msi-definition(18)}
  userNotSubscribed, invalidServedUserNumber, basicServiceNotProvided
    FROM H4501-General-Error-List {itu-t recommendation h 450 1 version1(0)
      general-error-list(1)}
  EndpointAddress
    FROM Addressing-Data-Elements {itu-t recommendation h 450 1 version1(0)
      addressing-data-elements(9)}
  MixedExtension
    FROM Call-Hold-Operations {itu-t recommendation h 450 4 version1(0)
      call-hold-operations(0)};

H323-MWI-Operations OPERATION ::=
  {mwiActivate | mwiDeactivate | mwiInterrogate}

mwiActivate OPERATION ::= {
  ARGUMENT  MWIActivateArg
  RESULT    DummyRes
  ERRORS
    {userNotSubscribed | invalidServedUserNumber | basicServiceNotProvided |
      undefined}
  CODE      local:80
}

mwiDeactivate OPERATION ::= {
  ARGUMENT  MWIDeactivateArg
  RESULT    DummyRes
  ERRORS
    {userNotSubscribed | invalidServedUserNumber | basicServiceNotProvided |
      undefined}
  CODE      local:81
}

mwiInterrogate OPERATION ::= {
  ARGUMENT  MWIInterrogateArg
  RESULT    MWIInterrogateRes
  ERRORS
    {userNotSubscribed | invalidServedUserNumber | notActivated |
      invalidMsgCentreId | undefined}
  CODE      local:82
}

MWIActivateArg ::= SEQUENCE {
  servedUserNr   EndpointAddress,
  basicService   BasicService,
  msgCentreId    MsgCentreId OPTIONAL,
  nbOfMessages   NbOfMessages OPTIONAL,
  originatingNr  EndpointAddress OPTIONAL,
  timestamp      TimeStamp OPTIONAL,
  priority       INTEGER(0..9) OPTIONAL,
  -- the value 0 means the highest priority and 9 the lowest
  extensionArg   SEQUENCE SIZE (0..255) OF MixedExtension OPTIONAL,
  ...
}

DummyRes ::= SEQUENCE SIZE (0..255) OF MixedExtension

MWIDeactivateArg ::= SEQUENCE {
  servedUserNr  EndpointAddress,
  basicService  BasicService,
  msgCentreId   MsgCentreId OPTIONAL,
  callbackReq   BOOLEAN OPTIONAL,
  extensionArg  SEQUENCE SIZE (0..255) OF MixedExtension OPTIONAL,
  ...
}

MWIInterrogateArg ::= SEQUENCE {
  servedUserNr  EndpointAddress,
  basicService  BasicService,
  msgCentreId   MsgCentreId OPTIONAL,
  callbackReq   BOOLEAN OPTIONAL,
  extensionArg  SEQUENCE SIZE (0..255) OF MixedExtension OPTIONAL,
  ...
}

MWIInterrogateRes ::= SEQUENCE SIZE (1..64) OF MWIInterrogateResElt

MWIInterrogateResElt ::= SEQUENCE {
  basicService   BasicService,
  msgCentreId    MsgCentreId OPTIONAL,
  nbOfMessages   NbOfMessages OPTIONAL,
  originatingNr  EndpointAddress OPTIONAL,
  timestamp      TimeStamp OPTIONAL,
  priority       INTEGER(0..9) OPTIONAL,
  -- the value 0 means the highest priority and 9 the lowest
  extensionArg   SEQUENCE SIZE (0..255) OF MixedExtension OPTIONAL,
  ...
}

MsgCentreId ::= CHOICE {
  -- only partyNumber provides a callable identification
  integer        INTEGER(0..65535),
  partyNumber    EndpointAddress,
  numericString  NumericString(SIZE (1..10))
}

NbOfMessages ::= INTEGER(0..65535)

TimeStamp ::= GeneralizedTime(SIZE (12..19))

-- a VisibleString representation of date and time following ISO 8601 
-- containing:
--	- the (local) date in 8 digits (YYYYMMDD),
--	- followed by (local) time of day in 4 or 6 digits [HHMM(SS)],
--	-	optionally followed by the letter "Z" or by a local time differential 
--		from UTC time in 5 digits ("+"HHMM or "-"HHMM);
-- Examples:
--	1) 19970621194530, meaning 21 June 1997, 19:45:30;
--	2) 19970621194530Z, meaning the same as 1);
--	3) 19970621194530-0500, meaning the same as 1), 
--		5 hours retarded in relation to UTC time
undefined ERROR ::= {
  PARAMETER  SEQUENCE SIZE (0..255) OF MixedExtension
  OPTIONAL   TRUE
  CODE       local:2002
}

invalidMsgCentreId ERROR ::=
  { -- returned by a Message Centre endpoint when an unknown Message 
  -- Centre Identifier is specified in a mwiInterrogate invoke
  CODE  local:1018
}

BasicService ::= ENUMERATED {
  -- MWI Services:
  --	for compatibility among vendors, speech is recommended for voice mail
  --	indications
  allServices(0), speech(1), unrestrictedDigitalInformation(2), audio3100Hz(3),
  telephony(32), teletex(33), telefaxGroup4Class1(34), videotexSyntaxBased(35),
  videotelephony(36), telefaxGroup2-3(37), reservedNotUsed1(38),
  reservedNotUsed2(39), reservedNotUsed3(40), reservedNotUsed4(41),
  reservedNotUsed5(42),
  --
  -- MWI Service Classes:
  email(51), video(52), fileTransfer(53), shortMessageService(54),
  speechAndVideo(55), speechAndFax(56), speechAndEmail(57), videoAndFax(58),
  videoAndEmail(59), faxAndEmail(60), speechVideoAndFax(61),
  speechVideoAndEmail(62), speechFaxAndEmail(63), videoFaxAndEmail(64),
  speechVideoFaxAndEmail(65), multimediaUnknown(66),
  serviceUnknown(67),
  --
  -- Reserved for future additions:
  futureReserve1(68), futureReserve2(69), futureReserve3(70),
  futureReserve4(71), futureReserve5(72), futureReserve6(73),
  futureReserve7(74), futureReserve8(75)}

notActivated ERROR ::= {CODE  local:31
}

END -- of Message-Waiting-Indication-Operations