Greetings...
http://www.itu.int/ITU-T/asn1/database/itu-t/x/x880/1994-TC1/Remote-Operations-Generic-ROS-PDUs.html#
has Invoke class. The linkedId item is defined as a CHOICE, and I can also see
that Invoke has constraints defined using linkedId in one of them.
Could someone help me understand the constraint, specifically the part using
linkedId and linkedId/opcode?
A snippet of the decoded PDU (a protocol analyzer for GSM MAP) as show below.
It seems that linkedId should be present, even if it is NULL, and I don't see
in the decoded PDU. I am sure I am not understanding something corretly.
Best regards,
-Arun.
Snippet of the PDU from the protocol analyzer:
octet0094 Component transaction message type: UMTS-MAP.......................
10100001 Component Type.... INVOKE , ContextSpecific/Constr.
00110010 Component length.. 50
00000010 Invoke ID tag..... Invoke ID tag
00000001 Invoke ID length.. 1
00000001 Invoke ID......... 1
00000010 LinkedID/OpCode?.. Local operation code tag
00000001 OpCode length..... 1
00101110 Operation code.... Mo-ForwardSM
octet0102 ForwardShortMessage {}
Definition of Invoke:
Invoke{InvokeId:InvokeIdSet, OPERATION:Operations} ::= SEQUENCE {
invokeId
InvokeId(InvokeIdSet)
(CONSTRAINED BY { -- must be unambiguous --} !
RejectProblem:invoke-duplicateInvocation),
linkedId
CHOICE {present [0] IMPLICIT present < InvokeId,
absent [1] IMPLICIT NULL
}
(CONSTRAINED BY { -- must identify an outstanding operation --} !
RejectProblem:invoke-unrecognizedLinkedId)
(CONSTRAINED BY { -- which has one or more linked operations--} !
RejectProblem:invoke-linkedResponseUnexpected) OPTIONAL,
opcode
OPERATION.&operationCode
({Operations} !RejectProblem:invoke-unrecognizedOperation),
argument
OPERATION.&ArgumentType
([EMAIL PROTECTED] !RejectProblem:invoke-mistypedArgument) OPTIONAL
}
(CONSTRAINED BY { -- must conform to the above definition --} !
RejectProblem:general-mistypedPDU)
(WITH COMPONENTS {
...,
linkedId ABSENT
} |
WITH COMPONENTS {
...,
linkedId PRESENT,
opcode (CONSTRAINED BY { -- must be in the &Linked field of the
associated operation --
} !RejectProblem:invoke-unexpectedLinkedOperation)
})
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