71863

71863
A P P E N D I X
B
ISDN Switch Types, Codes,
and Values
This appendix contains a list of the supported switch types. It also contains the ISDN cause codes,
cause values, bearer capability values, and progress description field values that are valid within the
debug commands for ISDN.
Note The ITU-T carries out the functions of the former Consultative Committee for International
Telegraph and Telephone (CCITT).
Switch Types
Table B-1 lists the ISDN switch types supported by the ISDN interface.
Table B-1
Supported ISDN Switch Types
Identifier
Description
basic-1tr6
German 1TR6 ISDN switches
basic-5ess
AT&T basic rate switches
basic-dms100
NT DMS-100 basic rate switches
basic-net3
NET3 ISDN and Euro-ISDN switches (UK and others),
also called E-DSS1 or DSS1
basic-ni1
National ISDN-1 switches
basic-nwnet3
Norway Net3 switches
basic-nznet3
New Zealand Net3 switches
basic-ts013
Australian TS013 switches
none
No switch defined
ntt
Japanese NTT ISDN switches (ISDN BRI only)
primary-4ess
AT&T 4ESS switch type for the U.S. (ISDN PRI only)
primary-5ess
AT&T 5ESS switch type for the U.S. (ISDN PRI only)
primary-dms100
NT DMS-100 switch type for the U.S. (ISDN PRI only)
primary-net5
NET5 ISDN PRI switches (Europe)
primary-ntt
INS-Net 1500 for Japan (ISDN PRI only)
primary-ts014
Australian TS014 switches (ISDN PRI only)
vn2
French VN2 ISDN switches (ISDN BRI only)
ISDN Switch Types, Codes, and Values B-1
Cause Code Fields
Table B-1
Supported ISDN Switch Types (Continued)
Identifier
Description
vn3
French VN3 ISDN switches (ISDN BRI only)
vn4
French VN4 ISDN switches (ISDN BRI only)
Cause Code Fields
Table B-2 lists the ISDN cause code fields that display in the following format within the debug
commands:
i=0x y1 y2 z1 z2 [a1 a2]
Table B-2
ISDN Cause Code Fields
Field
Value—Description
0x
The values that follow are in hexadecimal.
y1
8—ITU-T standard coding.
y2
0—User
1—Private network serving local user
2—Public network serving local user
3—Transit network
4—Public network serving remote user
5—Private network serving remote user
7—International network
A—Network beyond internetworking point
z1
Class (the more significant hexadecimal number) of cause value.
Refer to Table B-3 for detailed information about possible values.
z2
Value (the less significant hexadecimal number) of cause value.
Refer to Table B-3 for detailed information about possible values.
a1
(Optional) Diagnostic field that is always 8.
a2
(Optional) Diagnostic field that is one of the following values:
0—Unknown
1—Permanent
2—Transient
The following is sample output of this form from the debug isdn q931 command:
Cause i = 0x8790
Cause Values
Table B-3 lists descriptions of the cause value field of the cause information element. The notes
referred to in the Diagnostics column follow the table. For the debug isdn q931 command output,
drop the highest bit of the cause value before using this table. For example, a cause value of 0x90
becomes 0x10.
B-2 Debug Command Reference
Cause Values
Table B-3
ISDN Cause Values
Decimal
Value
Hex
Value
1
Cause
Diagnostics
Explanation
01
Unallocated
(unassigned) number
Note 10
The ISDN number was sent to the switch in
the correct format; however, the number is
not assigned to any destination equipment.
2
02
No route to specified
transit network
Transit network
identity (Note 9)
The ISDN exchange is asked to route the call
through an unrecognized intermediate
network.
3
03
No route to destination
Note 10
The call was routed through an intermediate
network that does not serve the destination
address.
6
06
Channel unacceptable
The service quality of the specified channel
is insufficient to accept the connection.
7
07
Call awarded and being
delivered in an
established channel
The user is assigned an incoming call that is
being connected to an already-established
call channel.
16
10
Normal call clearing
17
11
User busy
The called system acknowledges the
connection request but is unable to accept the
call because all B channels are in use.
18
12
No user responding
The connection cannot be completed
because the destination does not respond to
the call.
19
13
No answer from user
(user alerted)
The destination responds to the connection
request but fails to complete the connection
within the prescribed time. The problem is at
the remote end of the connection.
21
15
Call rejected
22
16
Number changed
The ISDN number used to set up the call is
not assigned to any system.
26
1A
Non-selected user
clearing
The destination is capable of accepting the
call but rejected the call because it was not
assigned to the user.
27
1B
Designation out of
order
The destination cannot be reached because
the interface is not functioning correctly, and
a signaling message cannot be delivered.
This might be a temporary condition, but it
could last for an extended period of time. For
example, the remote equipment might be
turned off.
28
1C
Invalid number format
The connection could be established because
the destination address was presented in an
unrecognizable format or because the
destination address was incomplete.
29
1D
Facility rejected
Note 10
Normal call clearing has occurred.
Note 10. User
supplied diagnostic
(Note 4)
The destination is capable of accepting the
call but rejected the call for an unknown
reason.
Facility identification
(Note 1)
The facility requested by the user cannot be
provided by the network.
ISDN Switch Types, Codes, and Values B-3
Cause Values
Table B-3
ISDN Cause Values (Continued)
Decimal
Value
Hex
Value
30
1E
Response to STATUS
ENQUIRY
The status message was generated in direct
response to the prior receipt of a status
enquiry message.
31
1F
Normal, unspecified
Reports the occurrence of a normal event
when no standard cause applies. No action
required.
34
22
No circuit/channel
available
The connection cannot be established
because no appropriate channel is available
to take the call.
38
26
Network out of order
The destination cannot be reached because
the network is not functioning correctly, and
the condition might last for an extended
period of time. An immediate reconnect
attempt will probably be unsuccessful.
41
29
Temporary failure
An error occurred because the network is not
functioning correctly. The problem will be
resolved shortly.
42
2A
Switching equipment
congestion
The destination cannot be reached because
the network switching equipment is
temporarily overloaded.
43
2B
Access information
discarded
44
2C
Requested
circuit/channel not
available
The remote equipment cannot provide the
requested channel for an unknown reason.
This might be a temporary problem.
47
2F
Resources unavailable,
unspecified
The requested channel or service is
unavailable for an unknown reason. This
might be a temporary problem.
49
31
Quality of service
unavailable
Table B-2
The requested quality of service cannot be
provided by the network. This might be a
subscription problem.
50
32
Requested facility not
subscribed
Facility identification
(Note 1)
The remote equipment supports the
requested supplementary service by
subscription only.
57
39
Bearer capability not
authorized
Note 3
The user requested a bearer capability that
the network provides, but the user is not
authorized to use it. This might be a
subscription problem.
58
3A
Bearer capability not
presently available
Note 3
The network normally provides the
requested bearer capability, but it is
unavailable at the present time. This might
be due to a temporary network problem or to
a subscription problem.
63
3F
Service or option not
available, unspecified
B-4 Debug Command Reference
Cause
Diagnostics
Discarded
information element
identifier(s) (Note 5)
Explanation
The network cannot provide the requested
access information.
The network or remote equipment was
unable to provide the requested service
option for an unspecified reason. This might
be a subscription problem.
Cause Values
Table B-3
ISDN Cause Values (Continued)
Decimal
Value
Hex
Value
65
Cause
Diagnostics
Explanation
41
Bearer capability not
implemented
Note 3
The network cannot provide the bearer
capability requested by the user.
66
42
Channel type not
implemented
Channel Type (Note
6)
The network or the destination equipment
does not support the requested channel type.
69
45
Requested facility not
implemented
Facility Identification
(Note 1)
The remote equipment does not support the
requested supplementary service.
70
46
Only restricted digital
information bearer
capability is available
The network is unable to provide
unrestricted digital information bearer
capability.
79
4F
Service or option not
implemented,
unspecified
The network or remote equipment is unable
to provide the requested service option for an
unspecified reason. This might be a
subscription problem.
81
51
Invalid call reference
value
The remote equipment received a call with a
call reference that is not currently in use on
the user-network interface.
82
52
Identified channel does
not exist
83
53
A suspended call
exists, but this call
identity does not
The network received a call resume request.
The call resume request contained a Call
Identify information element that indicates
that the call identity is being used for a
suspended call.
84
54
Call identity in use
The network received a call resume request.
The call resume request contained a Call
Identify information element that indicates
that it is in use for a suspended call.
85
55
No call suspended
The network received a call resume request
when there was not a suspended call
pending. This might be a transient error that
will be resolved by successive call retries.
86
56
Call having the
requested call identity
has been cleared
Clearing cause
The network received a call resume request.
The call resume request contained a Call
Identity information element, which once
indicated a suspended call. However, the
suspended call was cleared either by timeout
or by the remote user.
88
58
Incompatible
destination
Incompatible
parameter (Note 2)
Indicates that an attempt was made to
connect to non-ISDN equipment. For
example, to an analog line.
91
5B
Invalid transit network
selection
Channel identity
The receiving equipment is requested to use
a channel that is not activated on the
interface for calls.
The ISDN exchange was asked to route the
call through an unrecognized intermediate
network.
ISDN Switch Types, Codes, and Values B-5
Cause Values
Table B-3
ISDN Cause Values (Continued)
Decimal
Value
Hex
Value
95
5F
Invalid message,
unspecified
96
60
Mandatory information
element is missing
Information element
identifier(s) (Note 5)
The receiving equipment received a message
that did not include one of the mandatory
information elements. This is usually due to
a D-channel error. If this error occurs
systematically, report it to your ISDN service
provider.
97
61
Message type
non-existent or not
implemented
Message type
The receiving equipment received an
unrecognized message, either because the
message type was invalid or because the
message type was valid but not supported.
The cause is due to either a problem with the
remote configuration or a problem with the
local D channel.
98
62
Message not
compatible with call
state or message type
non-existent or not
implemented
Message type
The remote equipment received an invalid
message, and no standard cause applies. This
cause is due to a D-channel error. If this error
occurs systematically, report it to your ISDN
service provider.
99
63
Information element
non-existent or not
implemented
Information element
identifier(s) (Notes 5,
7)
The remote equipment received a message
that includes information elements, which
were not recognized. This is usually due to a
D-channel error. If this error occurs
systematically, report it to your ISDN service
provider.
100
64
Invalid information
element contents
Information element
identifier(s) (Note 5)
The remote equipment received a message
that includes invalid information in the
information element. This is usually due to a
D-channel error.
101
65
Message not
compatible with call
state
Message type
The remote equipment received an
unexpected message that does not
correspond to the current state of the
connection. This is usually due to a
D-channel error.
102
66
Recovery on timer
expires
Timer number (Note
8)
An error-handling (recovery) procedure was
initiated by a timer expiry. This is usually a
temporary problem.
111
6F
Protocol error,
unspecified
An unspecified D-channel error when no
other standard cause applies.
127
7F
Internetworking,
unspecified
An event occurred, but the network does not
provide causes for the action that it takes.
The precise problem is unknown.
Cause
Diagnostics
Explanation
An invalid message was received, and no
standard cause applies. This is usually due to
a D-channel error. If this error occurs
systematically, report it to your ISDN service
provider.
Note 1: The coding of facility identification is network dependent.
Note 2: Incompatible parameter is composed of incompatible information element identifier.
B-6 Debug Command Reference
Bearer Capability Values
Note 3: The format of the diagnostic field for causes 39, 3A, and 41 is shown in the ITU-T Q.850
specification, Table 3b/Q.850.
Note 4: User-supplied diagnostic field is encoded according to the user specification, subject to the
maximum length of the cause information element. The coding of user-supplied diagnostics should
be made in such a way that it does not conflict with the coding described in Table B-2.
Note 5: Locking and non-locking shift procedures described in the ITU-T Q.931 specification apply.
In principle, information element identifiers are in the same order as the information elements in the
received message.
Note 6: The following coding is used:
•
•
•
Bit 8—extension bit
Bit 7 through 5—spare
Bit 4 through 1—according to Table 4-15/Q.931 octet 3.2, channel type in ITU-T Q.931
specification
Note 7: When only locking shift information element is included and no variable length information
element identifier follows, it means that the codeset in the locking shift itself is not implemented.
Note 8: The timer number is coded in IA5 characters. The following coding is used in each octet:
•
•
Bit 8—Spare “0”
Bit 7 through 1—IA5 character
Note 9: The diagnostic field contains the entire transit network selection or network-specific
facilities information element, as applicable.
Note 10: See Table B-2 for the coding that is used.
Bearer Capability Values
Table B-4 lists the ISDN bearer capability values that display in the following format within the
debug commands:
0x8890 for 64 kbps or 0x8890218F for 56 kbps
Table B-4
ISDN Bearer Capability Values
Field
Value—Description
0x
Indication that the values that follow are in hexadecimal
88
ITU-T coding standard; unrestricted digital information
90
Circuit mode, 64 kbps
21
Layer 1, V.110/X.30
8F
Synchronous, no in-band negotiation, 56 kbps
Progress Field Values
Table B-5 lists the values of the Progress description field contained in the ISDN Progress indicator
information element.
ISDN Switch Types, Codes, and Values B-7
Progress Field Values
Table B-5
ISDN Progress Description Field Values
Bits
Decimal
Number
0000001
1
Call is not end-to-end ISDN; further call progress information may
be available in-band
0000010
2
Destination address is non-ISDN
0000011
3
Origination address is non-ISDN
0000100
4
Call has returned to the ISDN
0001000
8
In-band information or appropriate pattern now available
0001010
10
Delay in response at destination interface
Description
All other values for the progress description field are reserved.
B-8 Debug Command Reference
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