http://bugs.wireshark.org/bugzilla/show_bug.cgi?id=1652
------- Comment #4 from palos@xxxxxxxxxxxxx 2007-06-21 01:22 GMT -------
Hi.
I wrote simple way because I'm poor in English.
so, my expressions are not good to understand.
InitialDP is defined by ASN.1 as follows.
InitialDPArg ::= SEQUENCE {
serviceKey [0] ServiceKey ,
calledPartyNumber [2] CalledPartyNumber OPTIONAL,
callingPartyNumber [3] CallingPartyNumber OPTIONAL,
...
}
CallingPartyNumber ::= OCTET STRING (SIZE(
minCallingPartyNumberLength .. maxCallingPartyNumberLength))
A difference is "SEQUENCE SIZE(1) OF" is included(in CAP_CON) or not(in
CAP_IDP)
"DestinationRoutingAddress ::= SEQUENCE SIZE(1) OF CalledPartyNumber "
In CAP_IDP case, CallingPartyNumber is decoded as you mentioned and wireshark
dissects correctly.
In CAP_CON case, OCTET STRING TAG is needed.
=> binary 00 0 00100 (universal primitive octetstring)=> 0x04
BUT, the Wireshark dissects same way in both cases although ASN.1 definitions
are different.
Best regards.
palos
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