Wireshark-bugs: [Wireshark-bugs] [Bug 3974] wrong decoding of gtp.target identification
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Thu, 06 Dec 2012 10:27:04 +0000

changed bug 3974

What Removed Added
CC   wiresharkuser2@gmail.com

Comment # 13 on bug 3974 from 
According to 3GPP 29.060 V10.6.0 §7.7.37
(http://www.3gpp.org/ftp/Specs/html-info/29060.htm), there is no need for ASN.1
decoding within this IE.

Note 1 from this standard mentions: "The ASN.1 parameter TargetID is forwarded
NON-transparently in order to maintain backward compatibility".

This means the SGSN should TRANSCODE from the  "Target ID" over IU
interface(RANAP ASN.1, 25.413) to the "Target ID" over GN interface(GTPv1,
29.060). 

As a result, MCC, MNC, LAC, RAC, RNC-ID values shall be decoded as is:
- LAC is a 16-bit integer
- RAC is an 8-bit integer
- RNC-ID is a 16-bit integer (only 12 low order bits are meaningfull)
- MCC, MNC: as in other IEs.

Hope this helps fixing this bug (in next release? :-) ).

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