ITU-Q931 Information Elements

Codeset 0

Q931: IE Segmented Message (SM 0/00)

- Octet 1: IE type
bits 8-1 00 H
- Octet 3: mandatory
bit 8 First segment indicator
bits 7-1 Number of segment remaining
- Octet 4: mandatory
bits 7-1 Segmented message type

IE Field: First segment indicator (SM)

bit 8 First segment indicator
0 Subsequent segment to first segment
1 First segment of segmented message

Q931: IE Bearer Capability (BC  0/04)

- Octet 1: IE type
bits 8-1 04 H
- Octet 3: mandatory
bits 7-6 Coding standard
bits 5-1 Information transfer capability
- Octet 4: mandatory
bits 7-6 Transfer mode
bits 5-1 Information transfer rate
- Octet 4a: optional
bits 7-5 Structure
bits 4-3 Configuration
bits 2-1 Establishment
- Octet 4b: optional
bits 7-6 Symmetry
bits 5-1 Information transfer rate
- Octet 5: optional
bits 7-6 0 1
bits 5-1 User information layer 1 protocol
The contents of this field depends on the national implementation:
- Octet 5a: optional
bit 7 Synchronous/asynchronous
bit 6 Negotiation
bits 5-1 User rate
- Octet 5b: optional (V110/X30 in octet 5)
bits 7-6 Intermediate rate
bit 5 Network independent clock on Tx
bit 4 Network independent clock on Rx
bit 3 Flow control on Tx
bit 2 Flow control on Rx
- Octet 5b: optional (V120 in octet 5)
bit 7 Rate adaption header
bit 6 Multiple frame
bit 5 Mode of operation
bit 4 LLI negotiation
bit 3 Assignor/assignee
bit 2 In-band/out-band negociation
- Octet 5c: optional
bits 7-6 Number of stop bits
bits 5-4 Number of data bits
bits 3-1 Parity
- Octet 5d: optional
bit 7 Duplex mode
bits 6-1 Modem type
- Octet 6: optional
bits 5-1 User information layer 2 protocol
- Octet 7: optional
bits 5-1 User information layer 3 protocol

Maximum length (including octet 1 and 2): 13 octets

 

IE Field: Coding standard (BC)

bits 7-6 Coding standard.
0 0 CCITT standardized coding
0 1 Reserved
1 0 National standard
1 1 Standard defined for the network

IE Field: Information transfer capab. (BC)

bits 5 _ _ _ 1 Information transfer capability
0 0 0 0 0 Speech
0 1 0 0 0 Unrestricted digital information
0 1 0 0 1 Restricted digital information
1 0 0 0 0 3,1 kHz audio
1 0 0 0 1 7 kHz audio
1 1 0 0 0 Video

IE Field: Transfer mode (BC)

bits 7-6 Transfer mode
0 0 Circuit mode
1 0 Packet mode

IE Field: Information transfer rate (BC)

bits 5 _ _ _ 1 Information transfer rate
0 0 0 0 0 Packet mode

code used for the calls in packet mode
1 0 0 0 0 64 kbit/s Circuit mode
1 0 0 0 1 2 x 64 kbit/s Circuit mode
1 0 0 1 1 384 kbit/s Circuit mode
1 0 1 0 1 1536 kbit/s Circuit mode
1 0 1 1 1 1920 kbit/s Circuit mode

IE Field: Structure (BC)

bits 7 6 5 Structure
0 0 0 Default
0 0 1 8kHz integrity
1 0 0 Service data unit integrity
1 1 1 Unstructured

IE Field: Configuration (BC)

bits 4 3 Configuration
0 0 Point-to-point

IE Field: Establishment (BC)

bits 2 1 Establishment
0 0 Demand

IE Field: Symmetry (BC)

bits 7 6 Establishment
0 0 Bidirectional symmetric

IE Field: User information layer 1 prot.
- ETSI protocol (BC)

bits 5 _ _ _ 1 User information layer 1 protocol
0 0 0 0 1 Rate adaptation V110/X30
0 0 0 1 0 Recommendation G711 µ-law
0 0 0 1 1 Recommendation G711 A-law
0 0 1 0 0 Recommendation G721 32 kbit/s
0 0 1 0 1 Recommendation G722-G725 7 KHz audio :
0 0 1 1 0 Recommendation G7xx 384 kbit/s video
0 0 1 1 1 Non-CCITT rate adaptation
0 1 0 0 0 Rate adaptation V120
0 1 0 0 1 Rate adaptation X31

IE Field: User information layer 1 prot.
- British-Telecom ISDN2 protocol (BC)

bits 5 _ _ _ 1 User information layer 1 protocol
0 0 0 0 0 Recommendation I412
0 0 0 0 1 Rate adaptation V110/X30
0 0 0 1 0 Recommendation G711 µ-law
0 0 0 1 1 Recommendation G711 A-law
0 0 1 0 0 Recommendation G721 32 kbit/s
0 0 1 0 1 Recommendation G722-G725 7 KHz audio
0 0 1 1 0 Recommendation G7xx 384 kbit/s video
0 0 1 1 1 Non-CCITT rate adaptation
0 1 0 0 0 Rate adaptation V120
0 1 0 0 1 Rate adaptation X31

IE Field: Synchronous/asynch. (BC)

bit 7 Synchronous/asynchronous
0 Synchronous
1 Asynchronous

IE Field: Negotiation (BC)

bit 6 Negotiation
0 Negotiation in the band not possible.
1 Negotiation in the band possible.

IE Field: User rate (BC)

bits 5 _ _ _ 1 User rate
0 0 0 0 0 E-bits rec I460
0 0 0 0 1 0.6 kbit/s Recommendations V6 and X1.
0 0 0 1 0 1.2 kbit/s Recommendation V6.
0 0 0 1 1 2.4 kbit/s Recommendations V6 and X1.
0 0 1 0 0 3.6 kbit/s Recommendation V6.
0 0 1 0 1 4.8 kbit/s Recommendations V6 and X1.
0 0 1 1 0 7.2 kbit/s Recommendation V6.
0 0 1 1 1 8 kbit/s Recommendation I460.
0 1 0 0 0 9.6 kbit/s Recommendations V6 and X1.
0 1 0 0 1 14.4 kbit/s Recommendation V6.
0 1 0 1 0 16 kbit/s Recommendation I460.
0 1 0 1 1 19.2 kbit/s Recommendation V6.
0 1 1 0 0 32 kbit/s Recommendation I460.
0 1 1 1 0 48 kbit/s Recommendation V6 and X1.
0 1 1 1 1 56 kbit/s Recommendation V6.
1 0 0 0 0 64 kbit/s Recommendation X1.
1 0 1 0 1 0.1345 kbit/s Recommendation X1.
1 0 1 1 0 0.100 kbit/s Recommendation X1.
1 0 1 1 1 0.075/1.2 kbit/s Recommendations V6 and X1 (orig-dest/dest-orig).
1 1 0 0 0 1.2/0.075 kbit/s Recommendations V6 and X1 (orig-dest/dest-orig).
1 1 0 0 1 0.050 kbit/s Recommendations V6 and X1.
1 1 0 1 0 0.075 kbit/s Recommendations V6 and X1.
1 1 0 1 1 0.110 kbit/s Recommendations V6 and X1.
1 1 1 0 0 0.150 kbit/s Recommendations V6 and X1.
1 1 1 0 1 0.200 kbit/s Recommendations V6 and X1.
1 1 1 1 0 0.300 kbit/s Recommendations V6 and X1.
1 1 1 1 1 12 kbit/s Recommendation V6.

IE Field: Intermediate rate (BC)

bits 7 6 Intermediate rate
0 0 Not used
0 1 8 kbit/s.
1 0 16 kbit/s
1 1 32 kbit/s

IE Field: Network indep. clock on Tx (BC)

bit 5
0 Not required
1 Required

IE Field: Network indep. clock on Rx (BC)

bit 4
0 Cannot accept data
1 Can accept data

IE Field: Flow control on Tx (BC)

bit 3 Flow control on Tx
0 Not required
1 Required

IE Field: Flow control on Rx (BC)

bit 2 Flow control on Rx
0 Cannot accept data
1 Can accept data

IE Field: Rate adaption header (BC)

bit 7 Rate adaption. Header
0 Not included
1 Included

IE Field: Multiple frame (BC)

bit 6 Multiple frame
0 Not supported
1 Supported

IE Field: Mode of operation (BC)

bit 5 Mode of operation
0 Bit transparent
1 Protocol sensitive

IE Field: LLI negotiation (BC)

bit 4 LLI negotiation
0 Default, LLI=256 only
1 Full protocol negotiation

IE Field: Assignor/assignee (BC)

bit 3 Assignor/assignee
0 Default assignee.
1 Assignor only

IE Field: In-band/out-band nego. (BC)

bit 2 In-band/out-band negociation
0 With USER INFO on TSC
1 In-band using LL zero

IE Field: Number of stop bits (BC)

bits 7 6 Number of stop bits
0 0 Not used
0 1 1 bit:
1 0 1.5 bits
1 1 2 bits

IE Field: Number of data bits (BC)

bits 5 4 In-band/out-band neg.
0 0 Not used
0 1 5 bits
1 0 7 bits
1 1 8 bits

IE Field: Parity (BC)

bits 3 _ 1 Parity
0 0 0 Odd
0 1 0 Even
0 1 1 None
1 0 0 Forced to 0
1 0 1 Forced to 1

IE Field: Duplex mode (BC)

bit 7 Duplex mode
0 Half duplex
1 Full duplex

IE Field: Modem type (BC)

bits 6 _ _ _ _ 1 Modem type
0 0 0 0 0 0 Reserved
0 0 0 0 0 1 V21:
0 0 0 0 1 0 V22:
0 0 0 0 1 1 V22 bis:
0 0 0 1 0 0 V23:
0 0 0 1 0 1 V26
0 0 0 1 1 0 V26 bis
0 0 0 1 1 1 V26 ter
0 0 1 0 0 0 V27
0 0 1 0 0 1 V27 bis
0 0 1 0 1 0 V27 ter
0 0 1 0 1 1 V29
0 0 1 1 0 0 V32
0 0 1 1 0 1 V35

IE Field: User inform. layer 2 prot. (BC)

bits 5 _ _ _ 1 User information layer 2 protocol
0 0 0 1 0 Recommendation Q921
0 0 1 1 0 Recommendation X25 link level

IE Field: User inform. layer 3 prot. (BC)

bits 5 _ _ _ 1 User information layer 3 protocol
0 0 0 1 0 Recommendation Q931
0 0 1 1 0 Recommendation X25 packet layer

Q931: IE Cause (CAU 0/08)

- Octet 1: IE type
bits 8-1 08H
- Octet 3 mandatory
bits 7-6 Coding standard
bit 5 0
bits 4-1 Location
- Octet 3a: optional
bits 7-1 Recommendation
- Octet 4: mandatory
bits 7-5 Cause Class
bits 4-1 Cause Value
- Octet 5: mandatory
bits 8-1 Diagnostics

Maximum length (including octet 1 and 2): 32 octets

IE Field: Coding standard (CAU)

bits 7 6 Coding standard
0 0 CCITT standardized coding
0 1 Reserved
1 0 National standard
1 1 Standard specific to location

IE Field: Location (CAU)

bits 4 _ _ 1 Location
0 0 0 0 User
0 0 0 1 Private network serving the local user
0 0 1 0 Public network serving the local user
0 0 1 1 Transit network
0 1 0 0 Public network serving the remote user
0 1 0 1 Private network serving the remote user
0 1 1 1 International network
1 0 1 0 Network beyond interworking point

IE Field: Recommendation (CAU)

bits 7 _ _ _ _ _ 1 Recommendation
0 0 0 0 0 0 0 Q931
0 0 0 0 0 1 1 X21
0 0 0 0 1 0 0 X25

IE Field: Cause Class (CAU)

bits 7 _ 5 Class
0 0 0 Normal event
0 0 1 Normal event
0 1 0 Resources unavailable
0 1 1 Service or option not available
1 0 0 Service or option not implemented
1 0 1 Invalid message (e.g parameter out of range)
1 0 1 Protocol error (e.g unknown message)
1 1 1 Internetworking

IE Field: Cause Value(CAU)

Class
7 6 5		 Value
4 3 2 1		 Cause
number		 Cause
designation
0 0 0 0 0 0 0 1 Unallocated
0 0 1 0 2 No Route to specified transit network
0 0 1 1 3 No Route to destination
0 1 1 0 6 Channel unacceptable
0 1 1 1 7 Call awarded and being delivered in an establish channel
0 0 1 0 0 0 0 16 Normal call clearing
0 0 0 1 17 User busy
0 0 1 0 18 No user responding
0 0 1 1 19 No answer from user
0 1 0 1 21 Call Rejected
0 1 1 0 22 Number changed
1 0 1 0 26 Non-selected user clearing
1 0 1 1 27 Destination out of order
1 1 0 0 28 Invalid number format
1 1 0 1 29 Facility rejected
1 1 1 0 30 Response to STATUS ENQUIRY
1 1 1 1 31 Normal, unspecified
0 1 0 0 0 1 0 34 No circuit/channel available
0 1 1 0 38 Network out of order
1 0 0 1 41 Temporary failure
1 0 1 0 42 Switching equipement congestion
1 0 1 1 43 Access information discarded
1 1 0 0 44 Requested circuit/channel not available
1 1 1 1 47 Resources unavailable, unspecified
0 1 1 0 0 0 1 49 Quality of service unavailable
0 0 1 0 50 Requested facility not subcribed
1 0 0 1 57 Bearer capability not authorized
1 0 1 0 58 Bearer capability not presently available
1 1 1 1 63 Service or option not available, unspecified
1 0 0 0 0 0 1 65 Bearer capability not implemented
0 0 1 0 66 Channel type not implemented
0 1 0 1 69 Requested facility not implemented
0 1 1 0 70 Only restricted digital information bearer capability is available
1 1 1 1 79 Service or option not implemented, unspecified
1 0 1 0 0 0 1 81 Invalid call reference value
0 0 1 0 82 Identified channel does not exist
0 0 1 1 83 A suspended call exists, but this call identity does not
0 1 0 0 84 Call identity in use
0 1 0 1 85 No call suspended
0 1 1 0 86 Call having the requested call identity has been cleared
1 0 0 0 88 Incompatible destination
1 0 1 1 91 Invalid transit network selection
1 1 1 1 95 Invalid message, unspecified
1 1 0 0 0 0 0 96 Mandatory information element is missing
0 0 0 1 97 Message type not-existent or not implemented
0 0 1 1 98 Message not compatible with call state
or message type not-existent or not implemented
0 0 1 1 99 Information element not-existent or not implemented
0 1 0 0 100 Invalid information element contents
0 1 0 1 101 Message not compatible with call state
0 1 1 0 102 Recovery on timer expiry
1 1 1 1 111 Protocol error unspecified
1 1 1 1 1 1 1 127 Interworking unspecified

Q931: IE Call Identity (CI 0/10)

- Octet 1: IE type
bits 8-1 10 H
- Octets 3-n: mandatory
bits 8-1 Call Identity (any pattern allowed, e.g. IA5 characters)

Q931: IE Call State (CS 0/14)

- Octet 1: IE type
bits 8-1 14 H
- Octet 3: mandatory
bits 8-7 Coding standard
bits 6-1 Call state value
The contents of this field depends on the Coding standard field and the national implementation:

See also Features: ISDN Simulator - automatic IE updating by emulator

IE Field: Coding standard (CS)

bits 8-7 Coding standard
0 0 CCITT standardized coding
0 1 Reserved
1 0 National standard
1 1 Standard defined for the network

IE Field: Call state value (CS)
- Coding=CCITT

bits 6 _ _ _ _ 1 Call state value
User State Network State
0 0 0 0 0 0 U0-Null N0-Null
0 0 0 0 0 1 U1-Call initiated N1-Call initiated
0 0 0 0 1 0 U2-Overlap sending N2-Overlap sending
0 0 0 0 1 1 U3-Outgoing call proceeding N3-Outgoing call proceeding
0 0 0 1 0 0 U4-Call delivered N4-Call delivered
0 0 0 1 1 0 U6-Call present N6-Call present
0 0 0 1 1 0 U7-Call received N7-Call received
0 0 1 0 0 0 U8-Connect request N8-Connect request
0 0 1 0 0 1 U9-Incoming call proceeding N9-Incoming call proceeding
0 0 1 0 1 0 U10-Active N10-Active
0 0 1 0 1 1 U11-Disconnect request N11-Disconnect request
0 0 1 1 0 0 U12-Disconnect indication N12-Disconnect indication
0 0 1 1 1 1 U15-Suspend request N15-Suspend request
0 1 0 0 0 1 U17-Resume request N17-Resume request
0 1 0 0 1 1 U19-Release request N19-Release request
0 1 1 0 0 1 U25-Overlap receiving N25-Overlap receiving
bits 6 _ _ _ _ 1 Call state value (global interface)
0 0 0 0 0 0 REST 0 -Null
1 1 1 1 0 1 REST 1 -Restart Request
1 1 1 1 1 0 REST 2 -Restart

IE Field: Call state value (CS)
- British-Telecom protocol and Coding=CCITT

bits 6 _ _ _ _ 1 Call state value
User State Network State
0 1 1 0 0 1 Local Facility Request Call active
0 1 1 0 0 1 Call abort

IE Field: Call state value (CS)
- British-Telecom protocol and Coding=Std defined for network

bits 6 _ _ _ _ 1 Call state value
User State Network State
0 1 1 0 0 1 Awaiting clr ind rel req
0 1 1 0 0 1 Loc Fac Req Call failed
0 1 1 0 0 1 Call failed

IE Field: Call state value (CS)
- France-Telecom protocol and Coding=Std defined for network

bits 6 _ _ _ _ 1 Call state value
User State Network State
0 1 1 0 0 1 Suppl. serv. register req

Q931: IE CHannel Identification (CHI 0/18)

- Octet 1: IE type
bits 8-1 18 H
- Octet 3: mandatory
bit 7 Interface identifier present
bit 6 Interface type
bit 5 0
bit 4 Preferred/exclusive
bit 3 D-Channel Indicator
bits 2-1 Information channel selection
- Octet 3.1: optional
bits 7-1 Interface Identifier

- Octet 3.2: 		mandatory if the interface type selected in octet 3 is primary interface, otherwise absent
bits 7-6 Coding standard
bit 5 Number/map
bits 4-1 Channel type

- Octet(s) 3.3: 		mandatory if the interface type selected in octet 3 is primary interface, otherwise absent
bits 7-1 Channel number.

This octet may be repeated to indicate multiple channels.

See also Features: ISDN Simulator - automatic IE updating by emulator

IE Field: Interface identifier present (CHI)

bit 7 Interface identifier present
0 Interface implicitly identified
1 Interface explicitly identified

IE Field: Interface type (CHI)

bit 6 Interface type
0 Basic rate
1 Other interfaces (Primary rate)

IE Field: Preferred/exclusive (CHI)

bit 4 Preferred/exclusive
0 Preferred
1 Exclusive

IE Field: D-channel indicator (CHI)

bit 3 D-channel indicator
0 Channel is not the D-channel
1 Channel is the D-channel

IE Field: Info channel selection (CHI)

bits 2-1 Info channel selection Basic Rate
0 0 No channel
0 1 B1 channel
1 0 B2 channel
1 1 Any channel
bits 2-1 Info channel select Primary Rate
0 0 No channel
0 1 In following octets
1 0 Reserved
1 1 Any channel

IE Field: Coding standard (CHI)

bits 7 6 Coding standard
0 0 National standard
0 1 Reserved
1 0 National Standard
1 1 Standard defined for the network

IE Field: Number / map (CHI)

bit 5 Number / map
0 Channel indicated by number
1 Channel(s) indicated by the slot map

IE Field: Channel type (CHI)

bits 4 _ _ 1 Channel type
0 0 1 1 B-channel units
0 1 1 0 H0 channel units
1 0 0 0 H11 channel units
1 0 0 1 H12 channel units

Q931: IE Facility (FAC 0/1C)

- Octet 1: IE type
bits 8-1 1C H
- Octet 3: mandatory
bits 7-6 0 0
bits 5-1 Service discriminator
- Octet 4: mandatory
bits 8-7 Class
bit 6 Form
bits 5-1 Component tag
- Octet 5: mandatory
bit 8 Length format
bits 7-1 Length of component
- Octet 6: mandatory
bits 8-1 Component contents

IE Field: Service discriminator (FAC)

bits 5 _ _ _ 1 Service discriminator
1 0 0 0 1 Supplementary service applications

IE Field: Class (FAC)

bits 8 7 Class
1 0 Context-specific

IE Field: Form (FAC)

bit 6 Form
1 Constructor

IE Field: Component tag (FAC)

bits 5 _ _ _ 1 Component tag
0 0 0 0 1 Invoke
0 0 0 1 0 Return result
0 0 0 1 1 Return error
0 0 1 0 0 Reject

IE Field: Length format (FAC)

bit 8 Length format
0 length of the component length field in one octet

Q931: IE Progress Indicator (PI 0/1E)

- Octet 1: IE type
bits 8-1 1E H
- Octet 3: mandatory
bits 7-6 Coding standard
bit 5 0
bits 4-1 Location
- Octet 4: mandatory
bits 7-1 Progress description

IE Field: Coding standard (PI)

bits 7 6 Coding standard
0 0 CCITT standardized coding
0 1 Reserved
1 0 National standard
1 1 Standard specific to location

IE Field: Location (PI)

bits 4 _ _ 1 Location
0 0 0 0 User
0 0 0 1 Private network serving the local user
0 0 1 0 Public network serving the local user
0 1 0 0 Public network serving the remote user
0 1 0 1 Private network serving the remote user
0 1 1 1 International network
1 0 1 0 Network beyond interworking point

IE Field: Progress description (PI)

bits 7 _ _ _ _ _ 1 Progress description
0 0 0 0 0 0 1 1. Not end-to-end ISDN
0 0 0 0 0 1 0 2. Destination non-ISDN
0 0 0 0 0 1 1 3. Origination non-ISDN
0 0 0 0 1 0 0 4. Returned to the ISDN
0 0 0 1 0 0 0 8. In-band information available

Q931: IE Network Specific Facilities (NSF 0/20)

- Octet 1: IE type
bits 8-1 20 H
- Octet 3: mandatory
bits 7-1 Length of network identification
- Octet 3.1: mandatory
bits 7-5 Type of network identification
bits 4-1 Network identification plan
- Octet 3.2: mandatory
bits 7-1 Network identification (IA5 characters)
- Octet 4: mandatory
bits 7-1 Network specific facility specification

IE Field: Type of network identif. (NSF)

bits 7 _ 5 Type of network identification
0 0 0 User specified
0 1 0 National
0 1 1 International

IE Field: Network identification plan (NSF)

bits 4 _ _ 1 Network identification plan
0 0 0 0 Unknown
0 0 0 1 Carrier identification code
0 0 1 1 Data network identification code (X121)

Q931: IE Notification Indicator (NI 0/27)

- Octet 1: IE type
bits 8-1 27 H
- Octet 3: mandatory
bits 7-1 Notification description

IE Field: Notification description (NI)

bits 7 _ _ _ _ _ 1 Notification description
0 0 0 0 0 0 0 User suspended
0 0 0 0 0 0 1 User resumed
0 0 0 0 0 1 0 Bearer service change

Q931: IE Display (DI 0/28)

- Octet 1: IE type
bits 8-1 28 H
- Octets 3-n: mandatory
bits 7-1 Display information (IA5 characters)

Q931: IE Date / Time DT 0/29)

- Octet 1: IE type
bits 8-1 29 H
- Octets 3-8: mandatory
bits 8-1 Year
bits 8-1 Month
bits 8-1 Day
bits 8-1 Hour
bits 8-1 Minute
bits 8-1 Second

See also Features: ISDN Simulator - automatic IE updating by emulator

Q931: IE Keypad Facility (KF 0/2C)

- Octet 1: IE type
bits 8-1 2C H
- Octets 3-n: mandatory
bits 7-1 Keypad information (IA5 characters)

Q931: IE Information ReQuest (IRQ 0/32)

- Octet 1: IE type
bits 8-1 32 H
- Octet 3: mandatory
bit 7 Information request indicator
bits 6-1 Type of information

IE Field: Information request indicator (IRQ)

bit 1 Information request indicator
0 Information request completed
1 Prompt for additional information

IE Field: Type of information (IRQ)

bits 6 _ _ _ _ 1 Type of information
0 0 0 0 0 0 Undefined
0 0 0 0 0 1 Authorization code
0 0 0 0 1 0 Address digits
0 0 0 0 1 1 Terminal identification

Q931: IE Signal (SI 0/34)

- Octet 1: IE type
bits 8-1 34 H
- Octet 3: mandatory
bits 8-1 Signal value

IE Field: Signal value (SI)

bits 8 _ _ _ _ _ _ 1 Signal value
0 0 0 0 0 0 0 0 Dial tone on
0 0 0 0 0 0 0 1 Ring back tone on
0 0 0 0 0 0 1 0 Intercept tone on
0 0 0 0 0 0 1 1 Network congestion tone on
0 0 0 0 0 1 0 0 Busy tone on
0 0 0 0 0 1 0 1 Confirm tone on
0 0 0 0 0 1 1 0 Answer tone on
0 0 0 0 0 1 1 1 Call waiting tone on
0 0 0 0 1 0 0 0 off-hook warning tone on
0 0 1 1 1 1 1 1 tones off
0 1 0 0 0 0 0 0 Alerting on - pattern 0
0 1 0 0 0 0 0 1 Alerting on - pattern 1
0 1 0 0 0 0 1 0 Alerting on - pattern 2
0 1 0 0 0 0 1 1 Alerting on - pattern 3
0 1 0 0 0 1 0 0 Alerting on - pattern 4
0 1 0 0 0 1 0 1 Alerting on - pattern 5
0 1 0 0 0 1 1 0 Alerting on - pattern 6
0 0 0 0 0 1 1 1 Alerting on - pattern 7
0 1 0 0 1 1 1 1 Alerting off
Network-specific signal values
0 0 0 1 0 0 0 1 Recall dial tone on
0 0 0 1 0 0 1 0 Barge-in tone
1 1 1 1 1 0 1 0 Incoming additional call tone
1 1 1 1 1 0 1 1 Priority additional call tone
1 1 1 1 1 1 0 1 Expensive route warning tone (F)

Q931: IE Feature Activation (FA 0/38)

- Octet 1: IE type
bits 8-1 38 H
- Octet 3: mandatory
bits 7-1 Feature identifier number
- Octet 3a: optional
bits 7-1 Feature identifier number (continuation only if values 128 to 16383)

Q931: IE Feature Indication (FI 0/39)

- Octet 1: IE type
bits 8-1 39 H
- Octet 3: mandatory
bits 7-1 Feature identifier number
- Octet 3a: optional
bits 7-1 Feature identifier number (continuation only if values 128 to 16383)
- Octet 4: mandatory
bits 8-1 0 0 0 0
bits 4-1 Status indicator

IE Field: Status indicator (FI)

bits 8 _ _ _ _ _ _ 1 Signal value
0 0 0 0 Deactivated
0 0 0 1 Activated
0 0 1 0 Prompt
0 0 1 1 Pending

Q931: IE Endpoint Identifier (EI 0/3B)

- Octet 1: IE type
bits 8-1 3B H
- Octet 3: mandatory
bits 7-1 Use Service Identifier
Coded 127 when all terminals are being selected, and octet 4 may be omitted.
- Octet 4: optional
bit 7 Interpreter
bits 6-1 Terminal IDentifier

IE Field: Interpreter (EI)

bit 1 Interpreter
0 Terminal is selected if it is assigned the indicated TID and USID value.
1 Terminal is selected if it is not assigned the indicated TID bit, but is assigned the indicated USID value.

IE Field: Terminal IDentifier (EI)

bits 6 _ _ _ _ 1 Terminal IDentifier
x x x x x x 0 to 62 to uniquely identify a terminal.
1 1 1 1 1 1 63 when all terminals with the same USID value are being selected.

Q931: IE Service Profile Identification

- Octet 1: IE type
bits 8-1 3A H
- Octets 3-n: mandatory
bits 7-1 SPID (IA5 characters)

Q931: IE Information Rate (IR 0/40)

- Octet 1: IE type
bits 8-1 40 H
- Octet 3: mandatory
bits 7-6 0 0
bits 5-1 Incoming information rate
- Octet 4: mandatory
bits 7-6 0 0
bits 5-1 Outgoing information rate
- Octet 5: mandatory
bits 7-6 0 0
bits 5-1 Minimum incoming information rate
- Octet 6: mandatory
bits 7-6 0 0
bits 5-1 Minimum outgoing information rate

IE Field: Throughput class coding (IR)

bits 5 _ _ _ 1 Signal value
0 0 0 0 0 Reserved
0 0 0 0 0 Reserved
0 0 0 0 0 Reserved
0 0 0 1 1 75
0 0 1 0 0 150
0 0 1 0 1 300
0 0 1 1 0 600
0 0 1 1 1 1200
0 1 0 0 0 2400
0 1 0 0 1 4800
0 1 0 1 0 9600
0 1 0 1 1 19200
0 1 1 0 0 48000
0 1 1 0 1 Reserved
0 1 1 1 0 Reserved
0 1 1 1 1 Reserved

Q931: IE End-to-end Transit Delay (ETD 0/42)

- Octet 1: IE type
bits 8-1 42 H
- Octet 3: mandatory
bits 7-3 0 0 0 0 0
bits 2-1 Cumulative transit delay value
- Octet 3a: mandatory
bits 7-1 Cumulative transit delay value (cont)
- Octet 3b: mandatory
bits 7-1 Cumulative transit delay value (cont)
- Octet 4: mandatory
bits 7-3 0 0 0 0 0
bits 2-1 Requested end-to-end transit delay value
- Octet 4a: optional
bits 7-1 Requested end-to-end transit delay value (cont)
- Octet 4b: optional
bits 7-1 Requested end-to-end transit delay value (cont)
- Octet 5: optional
bits 7-3 0 0 0 0 0
bits 2-1 Maximum end-to-end transit delay value
- Octet 5a: optional
bits 7-1 Maximum end-to-end transit delay value (cont)
- Octet 5b: optional
bits 7-1 Maximum end-to-end transit delay value (cont)

Q931: IE Packet layer binary Parameters (PP 0/44)

- Octet 1: IE type
bits 8-1 44 H
- Octet 3: mandatory
bits 7-6 0 0
bits 5-4 Fast select
bit 3 Expedited data
bit 2 Delivery confirmation
bit 1 Modulus

IE Field: Fast select(PP)

bits 5 4 Fast select
0 0 Fast select not requested
0 1 Fast select not requested
0 1 Fast requested with no restriction of response
1 1 Fast requested with restriction of response

IE Field: Expedited data (PP)

bit 3 Expedited data
0 No request/request denied
1 Request indicated/request accepted

IE Field: Delivery confirmation (PP)

bit 2 Delivery confirmation
0 Link-by-link confirmation
1 End-to-end confirmation

IE Field: Modulus (PP)

bit 1 Modulus
0 Modulus 8 sequencing
1 Modulus 128 sequencing

Q931: IE Packet layer Window Size (PWS 0/45)

- Octet 1: IE type
bits 8-1 45 H
- Octet 3: mandatory
bits 7-1 Forward value
- Octet 4: optional
bits 7-1 Backward value

Q931: IE Packet layer Size (PS 0/46)

- Octet 1: IE type
bits 8-1 46 H
- Octet 3: mandatory
bits 7-1 Forward value
- Octet 4: optional
bits 7-1 Backward value

Q931: IE CallinG Party Number (CGPN 0/6C)

- Octet 1: IE type
bits 8-1 6C H
- Octet 3: mandatory
bits 7-5 Type of number
The contents of this field depends on the national implementation:
bits 4-1 Numbering plan
- Octet 3a: optional
bits 7-6 Presentation Indicator
bits 5-3 0 0 0
bits 2-1 Screening Indicator
- Octets 4-n: mandatory
bits 7-1 Number digits (IA5 characters)

IE Field: Type of number (CGPN)
- ETSI protocol

bits 7 _ 5 Type of number
0 0 0 Unknown
0 0 1 International number
0 1 0 National number
0 1 1 Network specific number
1 0 0 Subscriber number
1 1 0 Abbreviated number
1 1 1 Reserved

IE Field: Type of number (CGPN)
- France-Telecom protocol VN3

bits 7 _ 5 Type of number
0 0 0 En-bloc sending
1 0 1 Overlap sending

IE Field: Numbering plan (CGPN)

bits 4 _ _ 1 Numbering plan
0 0 0 0 Unknown
0 0 0 1 ISDN/Telephony
0 0 1 1 Data
0 1 0 0 Telex
1 0 0 0 National standard
1 0 0 1 Private
1 1 1 1 Reserved

IE Field: Presentation indicator (CGPN)

bits 7 6 Screening indicator
0 0 Presentation allowed
0 1 Presentation restricted
1 0 Number not available
1 1 Reserved

IE Field: Screening indicator (CGPN)

bits 2 1 Screening indicator
0 0 User-provided, not screened
0 1 User-provided, verified and passed
1 0 User-provided, verified and failed
1 1 Network provided

Q931: IE CallinG Party Subaddress (CGPS 0/6D)

- Octet 1: IE type
bits 8-1 6D H
- Octet 3: mandatory
bits 7-5 Type of subaddress
The contents of this field depends on the national implementation:
bit 4 Odd/even indicator
bits 3-1 0 0 0
- Octet 4: mandatory if type of subaddress is NSAP
bits 7-1 Authority and Format Identifier = 50
- Octets 5-n: mandatory
bits 7-1 Number digits (IA5 characters)

IE Field: Type of subaddress (CGPS)
- ETSI protocol

bits 7 _ 5   Type of subaddress
0 0 0   NSAP / ISO
0 1 0   User specified

IE Field: Type of subaddress (CGPS)
- Belgium protocol

bits 7 _ 5   Type of subaddress
0 0 0   User specified
0 0 1   NSAP / ISO
0 1 0   IA5 characters

IE Field: Odd/Even Indicator (CGPS )

bit 4   Odd/Even Indicator
0   Even number
1   Odd number

Q931: IE CalleD Party Number (CDPN 0/70)

- Octet 1: IE type
bits 8-1 70 H
- Octet 3: mandatory
bits 7-5 Type of number
The contents of this field depends on the national implementation:
bits 4-1 Numbering plan
- Octets 4-n: mandatory
bit 8 0
bits 7-1 Number digits (IA5 characters)

IE Field: Type of number (CDPN)
- ETSI protocol

bits 7 _ 5 Type of number
0 0 0 Unknown
0 0 1 International number
0 1 0 National number
0 1 1 Network specific number
1 0 0 Subscriber number
1 1 0 Abbreviated number
1 1 1 Reserved

IE Field: Type of number (CDPN)
- France-Telecom protocol VN3

bits 7 _ 5 Type of number
0 0 0 En-bloc sending
1 0 1 Overlap sending

IE Field: Numbering plan (CDPN)

bits 4 _ _ 1 Numbering plan
0 0 0 0 Unknown
0 0 0 1 ISDN/Telephony
0 0 1 1 Data
0 1 0 0 Telex
1 0 0 0 National standard
1 0 0 1 Private
1 1 1 1 Reserved

Q931: IE CalleD Party Subaddress (CDPS 0/71)

- Octet 1: IE type
bits 8-1 71 H
- Octet 3: mandatory
bits 7-5 Type of subaddress
The contents of this field depends on the national implementation:
bit 4 Odd/even indicator
bits 3-3 0 0 0
- Octet 4: mandatory if type of subaddress is NSAP
bits 7-1 Authority and Format Identifier = 50
- Octets 5-n: mandatory
bits 7-1 Number digits (IA5 characters)

IE Field: Type of subaddress (CDPS)
- ETSI protocol

bits 7 _ 5 Type of subaddress
0 0 0 NSAP / ISO
0 1 0 User specified

IE Field: Type of subaddress (CDPS)
- Belgium protocol

bits 7 _ 5 Type of subaddress
0 0 0 User specified
0 0 1 NSAP / ISO
0 1 0 IA5 characters

IE Field: Odd/Even Indicator (CDPS )

bit 4 Odd/Even Indicator
0 Even number
1 Odd number

Q931: IE Redirecting Number (RN 0/74)

- Octet 1: IE type
bits 8-1 74 H
- Octet 3: mandatory
bits 7-5 Type of number
bits 4-1 Numbering plan
- Octet 3a: optional
bits 7-6 Presentation Indicator
bits 5-3 0 0 0
bits 2-1 Screening Indicator
- Octet 3b: optional
bits 7-5 0 0 0
bits 4-1 Reason for redirection
- Octet 4: mandatory
bits 7-1 Number digits (IA5 characters)

IE Field: Type of number (RN)

bits 7 _ 5 Type of number
0 0 0 Unknown
0 0 1 International number
0 1 0 National number
0 1 1 Network specific number
1 0 0 Subscriber number
1 1 0 Abbreviated number
1 1 1 Reserved

IE Field: Numbering plan (RN)

bits 4 _ _ 1 Numbering plan
0 0 0 0 Unknown
0 0 0 1 ISDN/Telephony
0 0 1 1 Data
0 1 0 0 Telex
1 0 0 0 National standard
1 0 0 1 Private
1 1 1 1 Reserved

IE Field: Presentation indicator (RN)

bits 7 6 Presentation indicator
0 0 Presentation allowed
0 1 Presentation restricted
1 0 Number not available
1 1 Reserved

IE Field: Screening indicator (RN)

bits 2 1 Screening indicator
0 0 User-provided, not screened
0 1 User-provided, verified and passed
1 0 User-provided, verified and failed
1 1 Network provided

IE Field: Reason for redirection (RN)

bits 4 1 Screening indicator
0 0 0 0 Call forwarding busy or called DTE busy
0 0 1 0 Call forwarding no reply
1 0 0 1 Called DTE out of order
1 1 1 1 Call forwarding unconditional or systematic call redirection
1 0 1 0 Call forwarding by the called DTE

Q931: IE Redirection Number (RNN 0/76)

- Octet 1: IE type
bits 8-1 76 H
- Octet 3: mandatory
bits 7-5 Type of number
bits 4-1 Numbering plan
- Octet 4: mandatory
bits 7-1 Number digits (IA5 characters)

IE Field: Type of number (RNN)

bits 7 _ 5
 Type of number
0 0 0
 Unknown
0 0 1
 International number
0 1 0
 National number
0 1 1
 Network specific number
1 0 0
 Subscriber number
1 1 0
 Abbreviated number
1 1 1
 Reserved

IE Field: Numbering plan (RNN)

bits 4 _ _ 1
   Numbering plan
0 0 0 0
   Unknown
0 0 0 1
   ISDN/Telephony
0 0 1 1
   Data
0 1 0 0
   Telex
1 0 0 0
   National standard
1 0 0 1
   Private
1 1 1 1
   Reserved

Q931: IE Transit Network Selection (TNS 0/78)

- Octet 1: IE type
bits 8-1 78 H
- Octet 3: mandatory
bits 7-5 Type of network identification
bits 4-1 Network identification plan
- Octets 4-n: mandatory
bits 7-1 Network identification (IA5 characters)

IE Field: Type of network identification (TNS)

bits 7 _ 5 Type of network identification
0 0 0 User specified
0 1 0 National
0 1 1 International

IE Field: Network identification plan (TNS)

bits 4 _ _ 1 Network identification plan
0 0 0 0 Unknown
0 0 0 1 Carrier identification code
0 0 1 1 Data network identification code (X121)

Q931: IE RestarT indicator (RT 0/79)

- Octet 1: IE type
bits 8-1 79 H
- Octet 3: mandatory
bits 7-4 0 0 0 0
bits 3-1 Class

IE Field: Class (RT)

bits 3 _ 1 Class
0 0 0 Indicated channels
1 1 0 Single interface
1 1 1 All interfaces

Q931: IE Low Layer Compatibility (LLC 0/7C)

- Octet 1: IE type
bits 8-1 7C H
- Octet 3: mandatory
bits 7-6 Coding standard
bits 5-1 Information transfer capability
- Octet 3a: optional
bit 7 Negotiation indicator
bits 6-1 0 0 0 0 0 0
- Octet 4: mandatory
bits 7-6 Transfer mode
bits 5-1 Information transfer rate
- Octet 4a: optional
bits 7-5 Structure
bits 4-3 Configuration
bits 2-1 Establishment
- Octet 4b: optional
bits 7-6 Symmetry
bits 5-1 Information transfer rate
- Octet 5: optional
bits 7-6 0 1
bits 5-1 User information layer 1 protocol
The contents of this field depends on the national implementation:
- Octet 5a: optional
bit 7 Synchronous/asynchronous
bit 6 Negotiation
bits 5-1 User rate
- Octet 5b: optional (V110/X30 in octet 5)
bits 7-6 Intermediate rate
bit 5 Network independent clock on Tx
bit 4