1
Scope
2 References
3 Definitions
4 Abbreviations
5 Conventions
6 General
6.1 Introduction to Recommendation
structure
6.2 Messages, parameters and
information elements
6.3 Use of Application Transport
Mechanism
6.3.1 Introduction
6.3.2 Application Transport Instruction Indicators
6.3.3 Handling of Addressing Information
6.3.4 BAT ASE at a CMN
6.4 Bearer control tunnelling
6.4.1 Bearer control tunnelling procedure
7 Successful basic call set-up
7.1 Introduction
7.2 Forward address signalling - En bloc operation
7.2.1 Actions required at the originating SN
7.2.2 Actions required at an intermediate SN
7.2.3 Actions required at an intermediate CMN
7.2.4 Actions required at an outgoing gateway SN
7.2.5 Actions required at an outgoing
gateway CMN
7.2.6 Actions required at an incoming gateway SN
7.2.7 Actions required at an incoming gateway CMN
7.2.8 Actions required at the destination SN
7.2.9 Called party number for operator calls
7.2.10 Called number for calls to testing and measuring devices
7.3 Forward address signalling - overlap operation
7.3.1 Actions required at the originating SN
7.3.2 Actions required at an intermediate SN/CMN
7.3.3 Actions required at the destination SN
7.4 Outgoing bearer set-up procedure
7.4.1 Per-call bearer set-up in forward direction
7.4.2 Per-call bearer set-up in backward direction
7.4.3 Per-call bearer set-up using bearer control tunnelling - fast set-up
7.4.4 Per-call bearer set-up using bearer control tunnelling - delayed forward
7.4.5 Per-call bearer set-up using bearer control tunnelling - delayed backward
7.5 Incoming bearer set-up procedure
7.5.1 Per-call bearer set-up in forward direction
7.5.2 Per-call bearer set-up in backward direction
7.5.3 Per-call bearer set-up using bearer control tunnelling - fast set-up
7.5.4 Per-call bearer set-up using bearer control tunnelling - delayed forward
7.5.5 Per-call bearer set-up using bearer control tunnelling - delayed backward
7.6 Continuity message
7.6.1 Actions required at the originating SN
7.6.2 Actions required at an intermediate SN
7.6.3 Actions required at a CMN
7.6.4 Actions required at the destination SN
7.7 Address complete message or
Connect message
7.7.1 Actions required at the destination SN
7.7.2 Actions required at an intermediate SN/CMN
7.7.3 Actions required at an outgoing gateway SN/CMN
7.7.4 Actions required at an incoming gateway SN/CMN
7.7.5 Actions required at the originating SN
7.7.6 Internal through connection of the bearer path and awaiting answer
indication at the destination SN
7.8 Answer message
7.8.1 Actions required at the destination SN
7.8.2 Actions required at an intermediate SN/CMN
7.8.3 Actions required at an outgoing gateway SN/CMN
7.8.4 Actions required at an incoming gateway SN/CMN
7.8.5 Actions required at the originating SN
7.8.6 Return of answer from automatic terminals
7.9 Access Transport Parameter
7.10 Storage and release of Initial
Address Message information
8 Additional set-up procedures
8.1 Introduction
8.2 Call Progress
8.2.1 Actions required at the destination SN
8.2.2 Actions required at an intermediate SN/CMN
8.2.3 Actions required at the originating SN
8.3 Codec Negotiation
8.3.1 SN initiating codec negotiation
8.3.2 SN transiting codec negotiation
8.3.3 SN terminating codec negotiation
8.3.4 Outgoing bearer set-up procedure
8.3.5 Incoming bearer set-up procedure
8.3.6 Abnormal cases
8.4 Echo Control
8.4.1 General
8.4.2 Procedures
8.5 Propagation delay procedure
8.5.1 Procedure
8.6 Signalling procedures for
connection type allowing fallback
8.6.1 Actions in the forward direction
8.6.2 Actions in the backward direction - fallback indicated before answer
8.6.3 Actions in the backward direction - fallback indicated at answer
8.6.4 Actions in the backward direction - fallback does not occur
8.6.5 Echo control for connection types allowing fallback
8.7 Transit network selection
(national use)
8.8 Support for Temporary Alternative
Routing (TAR)
8.9 Hop counter procedure
8.9.1 Actions at the initiating SN/CMN
8.9.2 Actions at an intermediate SN/CMN
8.9.3 Actions at the destination SN
8.10 Charging
8.11 Access delivery indication
8.12 Information messages
8.12.1 Requesting information (national use)
8.12.2 Sending solicited information (national use)
8.12.3 Receiving a solicited information message (national use)
8.13 Call collect request procedure
8.14 Calling party number
8.15 Calling Geodetic location
procedure
8.15.1 Introduction
8.15.2 Transfer of Geodetic information
8.16 Inter-nodal traffic group
identification
8.16.1 Sending Inter-nodal traffic group identification
8.16.2 Receiving Inter-nodal traffic group identification
8.17 Carrier selection information
(national use)
8.17.1 Action required at the originating SN
8.17.2 Action required at an intermediate SN/CMN within the originating
network
8.17.3 Action required at an outgoing national gateway SN/CMN
8.17.4 Action required at an incoming national gateway SN/CMN
8.17.5 Action required at the destination SN
8.17.6 Action required at an international gateway SN/CMN
8.18 Global Call Reference
8.19 Bearer Control Unit Identifier
(BCU-ID)
8.19.1 General
8.19.2 Actions at an SN
8.19.3 Actions at a CMN
8.19.4 Selection of BCU-ID
8.19.5 Forward/Backward Bearer Establishment
8.20 Out-of-band transport of DTMF and Tone information
8.20.1 Introduction
8.20.2 Procedures
9 Unsuccessful call set-up
9.1 Introduction
9.2 Actions at a CSF initiating a
release message
9.3 Actions at an intermediate SN/CMN
9.4 Actions at the controlling SN/CMN
(i.e. the SN/CMN controlling the call)
9.4.1 Actions at a controlling SN
9.4.2 Actions at a controlling CMN
9.5 Tones and announcements
9.5.1 Tones and announcements at an SN
9.5.2 Tones and announcements at a CMN
9.6 Address incomplete
10 Mid-call procedures
10.1 Introduction
10.2 Suspend and resume
10.2.1 Suspend
10.2.2 Resume
10.2.3 Expiration of timer T6 or timer T38
10.3 Forward Transfer message
10.4 Codec modification/mid-call codec
negotiation procedures
10.4.1 SN initiating codec modification
10.4.2 SN terminating codec modification
10.4.3 SN transiting codec modification
10.4.4 SN initiating mid-call codec negotiation
10.4.5 SN terminating mid-call codec negotiation
10.4.6 SN transiting mid-call codec negotiation
10.4.7 Abnormal codec modification/mid-call codec negotiation cases
11 Normal call release
11.1 Introduction
11.2 Release initiated by a calling
party
11.3 Release initiated by a called
party
11.4 Release initiated by the network
11.5 Release sending procedure
11.6 Release reception procedure
11.7 Collision of Release messages
11.8 Charging (national use)
12 Network features
12.1 Introduction
12.2 Simple segmentation
12.3 Pre-release information transport
12.4 Automatic repeat attempt
12.5 Blocking and unblocking of CIC
values
12.5.1 Introduction
12.5.2 CIC group blocking procedures
12.5.3 Interactions between CIC blocking and call set-up procedures
12.5.4 Abnormal CIC group blocking procedures
12.6 CIC group query (national use)
12.6.1 General
12.6.2 Interpretation of CIC states
12.7 Support for Hard To Reach Network
Management functions
12.7.1 SN/CMN initiating HTR indication
12.7.2 SN receiving HTR indication
12.8 Automatic congestion control
12.8.1 Receipt of a release message containing an automatic congestion level
parameter
12.8.2 Actions taken during overload
12.9 Signalling transport
out-of-service and in-service indications
12.10 Signalling transport congestion
indications
13 Abnormal conditions
13.1 Introduction
13.2 Dual seizure
13.2.1 Unguarded interval
13.2.2 Detection of dual seizure
13.2.3 Preventive action
13.2.4 Action to be taken on detection of dual seizures
13.3 Reset of CICs
13.3.1 Reset CIC procedure
13.3.2 Group reset procedure
13.3.3 Abnormal group reset procedures
13.4 Receipt of unreasonable signalling
information
13.4.1 Handling of message format errors
13.4.2 Handling of unexpected messages
13.4.3 General requirements on receipt of unrecognized messages and parameters
13.4.4 Procedures for the handling of the unrecognized messages or parameters
13.4.5 Procedures for the handling of responses indicating unrecognized
information has been sent
13.4.6 Procedures for handling unreasonable parameters
13.4.7 Handling of the BICC_Error indication primitive
13.4.8 Compatibility for the BICC APM user application
13.5 Unequipped CIC message (national
use)
13.6 Overlength messages
13.7 Timer expiries
13.7.1 Failure in the Reset CIC procedure
13.7.2 Failure in the Group Reset procedure
13.7.3 Failure in the blocking/unblocking sequence
13.7.4 Failure to receive a Release Complete message - Timer T1 and T5
13.7.5 Failure to receive a response to an information request message
(national use)
Annex A – Timers
Annex B – Procedures
for reuse of idle bearers (network option)
B.1 Introduction
B.2 Procedures
B.2.1 Outgoing bearer set-up procedures
B.2.2 Incoming bearer set-up procedures
B.2.3 Continuity message
B.2.4 Codec negotiation
B.2.5 Release procedure
Annex C – Test calls
C.1 Called number for test calls
Annex D – Start-up
procedures
D.1 Introduction
D.2 Procedure for putting CICs into
service
D.3 Test procedures
Annex E – (Network Option) Procedures for use of
Structured AAL1 bearers
E.1 Introduction
E.2 Procedures
E.2.1 Codec negotiation
E.2.2 Release procedure
Appendix I – Message
flow examples
I.1 Introduction to message flows
I.2 Contents
Appendix
II – Generic BCF
functions
II.1 Introduction
II.2 BNC-ID
II.2.1 BNC-ID usage during call and bearer set-up
II.2.2 BNC-ID usage for idle bearer reuse procedure (Network option)
II.2.3 BNC-ID usage for structured AAL1 bearers
II.3 Bearer release control
II.4 BIWF address
II.5 BNC characteristics