03/02 Level 2 Troubleshooting
WorkCentre Pro 423/428 2-91 CHAPTER 2 TROUBLESHOOTING
Reason display value (q.931)
The information element "Reason display" is used in DISC, STATUS, and other signals to
indicate the reason for signal generation. D-channel disconnection can be determined also
from "generation source" indicating the signal source (network or equipment).
"Display value" in the table is a hexadecimal value indicated in the FF of each signal.
"Number" in the rightmost column of the table is a unique number (decimal) indicating the
contents of each reason. This value is used to inquire the carrier (NTT or other) or other
manufacturer.
List of reason display values in information element "Reason display"
Display
value
(hex)
Reason Diagnostic information
(May be added)
Number
(decimal)
81 Missing - #1
82 No route to relay network Relay network #2
83 No route to relay network *(See supplemental
explanation)
-#3
86 Channel disabled - #6
87 Termination at preset channel - #7
90 Normal disconnection * - #16
91 Terminating user busy - #17
92 No response from terminating user (No ALERT
or CONN) *
- #18
93 No response from terminating user after
alerting (ALERT received) *
- #19
94 Subscriber not present (No wireless
communication with remote mobile station)
- #20
95 Communication rejected - #21
96 Remote subscriber number changed New subscriber
number
#22
9A
Non-selected user recovered from
disconnection
- #26
9B Unable to activate terminating interface (Fault
or power-off)
- #27
9C Termination number of invalid format or not
complete (too short) *
- #28
9D Requested facility not available from network Facility identifier #29
9E Response to status inquiry - #30
9F Other normal class - #31
A2 No line or channel for use - #34
A6 Network fault - #38
A9 Temporary network fault (Connectable by
redialling)
- #41
AA Switchboard congestion - #42
Display
value
(hex)
Reason Diagnostic information
(May be added)
Number
(decimal)
AB Information elements partially discarded by
network
Discarded information
element identifier
#43
AC Requested line or channel not available - #44
AF Other resources unavailable class - #47
B1 Requested service quality (QOS) not available - #49
B2 Requested additional service not under
contract
Facility identifier #50
B9 Requested transmission capability not
permitted by network
Attribute number or
other
#57
BA Requested transmission capability not available
now
Attribute number or
other
#58
BF Other service unavailable class - #63
C1 Requested transmission capability not provided
by network
Attribute number or
other
#65
C2 Non-provided channel type specified Channel type #66
C5 Non-provided additional service requested Facility identifier #69
C6 Only limited digital information transfer
capability available
- #70
CF Other service non-provided class - #79
D1 Invalid call number in use - #81
D2 Invalid channel number in use Channel type #82
D3 Specified suspended call ID number not in use - #83
D4 Suspended call ID number in use - #84
D5 Restart request for no suspended call in
network
- #85
D6 Suspended call already recovered from
disconnection
Cause of disconnection #86
D7 User not a member of group security (Closed
Users Group)
- #87
D8 Terminal attribute mismatch * Mismatching
parameter
#88
DB Invalid relay network selected - #91
DF Other invalid message class - #95
E0 Essential information element missing Info. element identifier #96
E1 Message type not defined or provided Message type #97
E2 Message not matching call status, defined, or
provided
Message type #98
E3 Information element not defined or provided Info. element identifier #99
E4 Invalid information element Message type #100
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