Wireshark · Wireshark-bugs: [Wireshark-bugs] [Bug 3974] wrong decoding of gtp.target identification

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wiresharkuser2@gmail.com changed bug 3974

What	Removed	Added
CC		wiresharkuser2@gmail.com

Comment # 13 on bug 3974 from wiresharkuser2@gmail.com

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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