Dear William,
Thanks for the advice and information. I
will try to find an earlier TCAP specification. But again I have a problem that
Erlang ASN.1 compiler doesn’t support MACROS. So I need to find a spec
with Information Objects, instead of MACROS.
Also thanks for the generous invitation to
validate my results by running it against your implementation. I will get in
touch with you as soon as I could produce some results. I’m sure your
assistance will be a great help for me.
Thanks!
Best Regards,
Eranga
From: William H.
Skelton [mailto:[EMAIL PROTECTED]
Sent: Friday, October 01, 2004
4:39 PM
To: [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]
Subject: RE: [OSS_ASN1] [ASN1]
ASN.1 Parameterized Types... pls help
Dear Eranga,
The earlier TCAP specifications should be available from the ITU-T. As
they use an earlier, simpler form of ASN.1 but are fully compatible (I think)
you may be able to avoid the problems you are facing with parameterized types
altogether.
Regarding the implementation of the GSM/TCAP stack I'm afraid I can only
confirm in our experience it is a huge amount of effort. If you are
interested to validate your result by running it against a proven industry
implementation, I could put you in touch with our mobile communications design
team.
William
At 10:17 01.10.2004 +0600, Casper
wrote:
Hi William,
Thanks for the advice.
This is for a R&D project. We plan to look at the feasibility of using
Erlang/OTP platform for development. Currently doing investigation on ASN.1
compiler on Erlang. Im very new to ASN.1, so find it difficult to capture
some parts of the specification. The GSM/UMTS MAP ASN.1 spec is alright. But I
couldnt still figure out how to use TCAP ASN.1 spec can generate the TCAP
Begin, Continue, End, etc message encoding/decoding functions.
With help from some generous people out there, I could understand that I will
have to create the ASN.1 spec of mine or find a standard spec, which will
Instantiate the Parameterized Type specified in the TCAP. If you could point me
to a standard spec like that or give me a sample how I could write something
like that, would be very helpful. How to blend the MAP and TCAP ASN.1 specs?
Thanks!
Eranga
From: William H.
Skelton [mailto:[EMAIL PROTECTED]]
Sent: Friday, October 01, 2004
3:12 AM
To: [EMAIL PROTECTED]
Subject: Fwd: [OSS_ASN1] [ASN1]
ASN.1 Parameterized Types... pls help
Hi Eranga,
We found you can avoid some of the problems by using earlier TCAP
specifications, which are fully compatible (I think), but simpler.
Just as a matter of interest, is this a commercial or university project you
are working on? Are you building your own tools?
William
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Date: Wed, 29 Sep 2004 18:07:45 +0600
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Subject: [OSS_ASN1] [ASN1] ASN.1 Parameterized Types... pls help
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Hi
All,
I'm finding difficult in absorbing "How to use ASN.1 TCAPMessage to
transport GSM MAP". The problem is how to generate TCAP Begin, Continue,
End, etc messages.
I read about the ASN.1 Parameterized Type, but still I could find the match of
ASN.1 specs for MAP and TCAP. I thought below might be the way, but still that
gives some compilation errors.
mapSpecificAS ABSTRACT-SYNTAX ::= {
MapSpecificPDUs
IDENTIFIED BY gsm-MessagingId
}
MapSpecificPDUs ::=
TCMessage{{ MAPOperations-Invokable}, { MAPOperations-Returnable}}
MAPOperations-Invokable OPERATION ::=
{sendRoutingInfoForSM | mo-ForwardSM |
mt-ForwardSM}
MAPOperations-Returnable OPERATION ::=
{reportSM-DeliveryStatus | alertServiceCentre |
informServiceCentre | readyForSM}
The error is as below (Erlang ASN.1 compiler),
{error,{asn1,[{error,{type,57,
'TCAPMessages',
'MapSpecificPDUs',
{asn1,{duplicates_of_the_tags,
[{'UNIVERSAL','INTEGER'}]}}}}]}}
For your information, I have attached TCAPMessages.asn and
MAP-ShortMessageServiceOperations.asn.
I appreciate if anybody out there can give me some clue to solve this problem.
Thanks in advance!
Eranga
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------------------------------------------------------------------------
William H. Skelton, Engineering Dept.
SOLINET GmbH Solutions for Innovative Networks
Mittlerer Pfad 26, 70499 Stuttgart,
Germany
Tel +49 711 1398 1377, Fax +49 711 866 1240
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[EMAIL PROTECTED], www.SOLINET.com
