1 Scope
2
Normative references
3
Definitions and abbreviations
3.1 Definitions
3.2 Abbreviations
4
Introduction
4.1 General
4.1.1 X.31 Case A access
4.1.2 X.31 Case B, B-channel access
4.1.3 X.31 Case B, D-channel access
4.2 Reference Configurations
4.2.1 Using access to PSPDN services (X.31 Case
A)
4.2.2 Using the ISDN virtual circuit service
(X.31 Case B) through the B-channel or the D‑channel
4.3 Protocol Pillars
4.3.1 Using access to PSPDN services (X.31 Case
A)
4.3.2 Using the ISDN virtual circuit service
(X.3 1 Case B) through the B-channel
4.3.3 Using the ISDN virtual circuit service
(X.31 Case B) through the D-channel
5
Layer 1
5.1 Basic access
5.2 Primary rate access
6
Access to PSPDN services (X.31 Case A)
6.1 Co-ordination between B-channel and D-channel
6.1.1 General
6.1.2 Outgoing calls
6.1.3 Incoming calls
6.1.4 Clearing virtual circuits
6.1.5
Error handling
6.2 Layer 2 protocols
6.2.1 Layer 2 protocol for the D-channel
6.2.2 Layer 2 protocol for the B-channel
6.2.2.1 Application rules
6.2.2.2
Implementation recommendations
6.3 Layer 3 protocols
6.3.1 Layer 3 protocol for the D-channel
6.3.1.1 The access protocol
6.3.1.2
Terminal addresses
6.3.1.3 Outgoing calls
6.3.1.4 Incoming Calls
6.3.1.5 Release of the
switched connection
6.3.1.6
Supplementary services
6.3.2 Layer 3 protocol for the B-channel
6.3.2.1 Bearer Independent
Service
6.3.2.2 Operation over
multiple B-channels
6.3.2.3
DTE role
6.3.2.4 Logical channels to
be used
6.3.2.5 Packet sizes
6.3.2.6 Default packet level
window size
6.3.2.7
Default throughput class
6.3.2.8 D-bit
6.3.2.9 Q-bit
6.3.2.10 Protocol identifier
6.3.2.11 Address fields
6.3.2.12 Data Link
Disconnection Request
6.3.2.13 Optional user
facilities that shall be supported
6.3.2.14 Recommended optional
user facilities and CCITT specified DTE facilities
6.3.2.15 Excluded Optional
user facilities
7
Access to the ISDN virtual circuit service (X.31 Case B) through the
B-channel
7.1 Coordination between B-channel and D-channel
7.1.1 General
7.1.2 Outgoing calls
7.1.3 Incoming calls
7.1.4 Clearing virtual circuits
7.1.5 Error handling
7.2 Layer 2 protocols
7.2.1 Layer 2 protocol for the D-channel
7.2.2 Layer 2 protocol for the B-channel
7.2.2.1 Application rules
7.2.2.2 Implementation
recommendations
7.3 Layer 3 protocols
7.3.1 Layer 3 protocol for the D-channel
7.3.1.1 The access protocol
7.3.1.2 Terminal addresses
7.3.1.3 Outgoing calls
7.3.1.4 Incoming calls
7.3.1.5 Release of the
switched connection
7.3.1.6 Supplementary
services
7.3.2 Layer 3
protocol for the B-channel
7.3.2.1 Bearer Independent
Service
7.3.2.2 Operation over
multiple B-channels
7.3.2.3 DTE role
7.3.2.4 Logical channels to be used
7.3.2.5 Packet sizes
7.3.2.6 Default packet level
window size
7.3.2.7 Default throughput
class
7.3.2.8 D-bit
7.3.2.9 Q-bit
7.3.2.10 Protocol identifier
7.3.2 11 Address fields
7.3.2.12 Data Link
Disconnection Request
7.3.2.13 Optional user
facilities that shall be supported
7.3.2.14 Recommended optional
user facilities and CCITT specified DTE facilities
7.3.2.15 Excluded optional user facilities
8
Access to the ISDN virtual circuit service (X.31 Case B) through the
D-channel
8.1 Layer 2 protocol
8.1.1 The base Recommendation
8.1.2 Same Connection Endpoint Suffix (CES)
8.1.3 Responsibility for Data Link set-up
8.2 Layer 3 protocols
8.2.1 General
8.2.2 Layer 3 ISDN signalling protocols
8.2.2.1 The base Recommendation
8.2.2.2 Terminal addresses
8.2.2.3 Outgoing calls
8.2.2.4 Incoming calls
8.2.2.5
Release of the call
8.2.2.6 Supplementary
services
8.2.3 Layer 3 data communication protocol
8.2.3.1 Bearer Independent
Service
8.2.3.2 Operation over p-Data Link Connections
8.2.3.3 DTE role
8.2.3.4 Logical channels to
be used
8.2.3.5 Packet sizes
8.2.3.6 Default packet level window size
8.2.3.7 Default throughput
class
8.2.3.8 D-bit
8.2.3.9 Q-bit
8.2.3.10 Protocol identifier
8.2.3.11 Address fields
8.2.3.12 Data Link
Disconnection Request
8.2.3.13 Optional user
facilities that shall be supported
8.2.3.14 Recommended optional
user facilities and CCITT specified DTE facilities
8.2.3.15 Excluded optional
user facilities
Annex A (informative) – ISDN lower layer communication modes for
syntax-based Videotex
Annex B (informative) – Overview on communication establishment parameters
B.1 General
B.2 X.25 packet service access
B.2.1 X.25 packet service access parameters
B.2.2
Access of X.25 packet services over the B-channel (X.31 Case A or Case
B)
B.2.3 Access of X.25 packet services over the
D-channel (X.31 Case B)
B.3 Case selection for communication establishment
B.3.1
Outgoing calls
B.3.2 Incoming calls
Annex C (informative) – End-to-end system configurations
C.1 Introduction
C.2 Network configurations
C.3 Types of interfaces at the two end-systems
C.4 End-system characteristics
Annex D (normative) – Additional provisions for Recommendation
X.31
D.1 General
D.2 Subclause 2.2/X.31: Configuration for the ISDN virtual circuit
service (Case B)
D.3 Subclause 3.2.3.2/X.31: Conditional notification class
D.4 Subclause 3.2.3.3/X.31: Unconditional notification class
D.5 Subclause 3.2.3.4/X.31: Information mapping from the X.25
incoming call packet to the Q.931 message
D.6 Subclause 4.1/X.31:
Terminal and interface selection
D.7 Subclause 6.1.1/X.31: Circuit-switched access to PSPDN
services (Case A)
D.8 Subclause 6.1.2.1/X.31: B-channel
D.9 Subclause 6.2.1.2/X.31: Channel selection
D.10 Subclause
6.2.2.1/X.31: B-channel
D.11 Subclause 6.2.2.3.1/X.31: Channel selection through call
offering
D.12 Subclause 6.2.2.3.2/X.31: Information element mapping
D.13 Subclause 6.4.1/X.31: B-channel
D.14 Subclause 7.3.2/X.31: Rate adaption
Annex E (normative) – Additional provisions for Recommendation
Q.931
E.1 General
E.2 Subclause 2.1.2/Q.931: Network call states
E.3 Subclause 3.1/Q.931: Messages for circuit mode connection
control
E.4 Subclause 3.1.4/Q.931: CONNECT
E.5 Subclause 3.1.8/Q.931: Information
E.6 Subclause 3.1.16/Q.931: Setup
E.7 Subclause 3.2/Q.931: Messages for packet-mode access
connection control
E.8 Subclause 3.4/Q.931: Messages used with the global call
reference
E.9 Subclause 4.3/Q.931: Call reference
E.10 Subclause 4.4/Q.931: Message type
E.11 Subclause 4.5/Q.931: Other information elements
E.12 Subclause 4.5.1/Q.931: Coding rules
E.13 Subclause 4.5.2/Q.931: Extension codesets
E.14 Subclause 4.5.5/Q.931: Bearer capability
E.15 Subclause 4.5.6/Q.931: Call identity
E.16 Subclause 4.5.7/Q.931: Call state
E.17 Subclause 4.5.8/Q.931: Called party number
E.18 Subclause 4.5.9/Q.931: Called party sub-address
E.19 Subclause 4.5.10/Q.931: Calling party number
E.20 Subclause 4.5.11/Q.931: Calling party sub-address
E.21 Subclause 4.5.13/Q.931: Channel identification
E.22 Subclause 4.5.15/Q.931: Display
E.23 Subclause 4.5.16/Q.931: High layer compatibility
E.24 Subclause 4.5.18/Q.931: Low layer compatibility
E.25 Subclause 4.5.21/Q.931: Notification indicator
E.26 Subclause 4.5.23/Q.931: Repeat indicator
E.27 Subclause 4.5.24/Q.931: Restart indicator
E.28 Subclause 4.7.6/Q.931: Redirecting number
E.29 Subclause 5.1.1/Q.931: Call request
E.30 Subclause 5.1.2/Q.931: B-channel selection – Originating
E.31 Subclause 5.1.8/Q.931: Call connected
E.32 Subclause 5.2/Q.931: Call establishment at the destination
interface
E.33 Subclause 5.2.1/Q.931: Incoming call
E.34 Subclause 5.2.3.1/Q.931: SETUP message delivered by
point-to-point data link
E.35 Subclause 5.2.6/Q.931: Notification of interworking at the
terminating interface
E.36 Subclause 5.2.4/Q.931: Overlap receiving
E.37 Subclause 5.2.7/Q.931: Call accept
E.38 Subclause 5.3.3/Q.931: Clearing initiated by the user
E.39 Subclause 5.3.4.3/Q.931: Completion of clearing
E.40 Subclause 5.3.5/Q.931: Clear collision
E.41 Subclause 5.5/Q.931: Restart procedure
E.42 Subclause 5.5.1/Q.931: Sending RESTART
E.43 Subclause 5.5.2/Q.931: Receipt of RESTART
E.44 Subclause 5.6/Q.931: Call rearrangements
E.45 Subclauses 5.6.1/Q.931 and 5.6.2/Q.931: Call
suspension/suspended
E.46 Subclause 5.6.3/Q.931: Call suspend error
E.47 Subclause 5.6.4/Q.931: Call re-establishment
E.48 Subclause 5.6.5/Q.931: Call resume errors
E.49 Subclause 5.8.3.1/Q.931: Invalid call reference format
E.50 Subclause 5.8.3.2/Q.931: Call reference procedural errors
E.51 Subclause 5.8.5/Q.931: General information element errors
E.52 Subclause 5.8.7.2/Q.931: Non-mandatory information element
content error
E.53 Subclause 5.8.9/Q.931: Data link failure
E.54 Subclause 5.8.10/Q.931: Status enquiry procedure
E.55 Annex B/Q.931: Compatibility checking
Annex F (normative) – Information elements for the control of
packet-mode access connections
F.1 Protocol discriminator
F.2 Call reference
F.3 Message type
F.4 Other information elements
F.6 Redirecting number
Annex G (informative) – References