aaaa    CC cause value, see section 10.5.4.11/GSM 04.08
                    '*' is shown in front of cause value if cause is made up
                    by CC layer in MS

        bbbb    MM cause value, see section 10.5.3.6/GSM 04.08
                    '*' is shown in front of cause value if cause is made up
                    by MM layer in MS

        cccc    RR cause value, see section 10.5.2.31/GSM 04.08
                  '*' is shown in front of cause value if cause is made up
                  by RR layer in MS

        All cause values are shown in decimal form.