Wireshark-bugs: [Wireshark-bugs] [Bug 9085] GSM A-I/F DTAP - Detach Request - Detach type is not
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Fri, 30 Aug 2013 15:00:44 +0000

Comment # 2 on bug 9085 from 
Hello,

In GSM A-I/F DTAP - Detach Request message the Detach type is not shown
properly. In attach you can find a Network originated Detach Request message
example.

In 1.10.1 and 1.11.0 SVN 51596 it is represented in this way:

GSM A-I/F DTAP - Detach Request
    Protocol Discriminator: GPRS mobility management messages
    DTAP GPRS Mobility Management Message Type: Detach Request (0x05)
    Force to Standby
        0... .... = Spare bit(s): 0
        .000 .... = Force to standby: Force to standby not indicated (0)

Hex value of the "Detach Request" message is "08 05 02".
The last byte (0x02) is stands for "Detach Type" and "Force to standby"
according to 3GPP TS 24.008 (9.4.5.1). 
"Force to standby" is represented correctly, but
"Detach type" is lost, but it should be there.

According to 3GPP TS 24.008 10.5.5.5 it should be:
Force to Standby
0... .... = Spare bit(s): 0
.000 .... = Force to standby: Force to standby not indicated (0)
Detach type
.... 0... = Power-off: Spare in the network to MS direction
...  .010 = Type of detach: Re-attach not required

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