ISO/IEC 13869:2003
Information technology — Telecommunications and information exchange between systems — Private Integrated Services Network — Inter-exchange signalling protocol — Call Transfer supplementary service
ISO/IEC 13869:2003 specifies the signalling protocol for the support of the Call Transfer supplementary service (SS-CT) at the Q reference point between Private Integrated Network services eXchanges (PINXs) connected together within a Private Integrated Services Network (PISN).
SS-CT is a supplementary service which enables a User to transform two of that User's calls (at least one of which must be answered) into a new call between the two other users in the two calls.
The Q reference point is defined in ISO/IEC 11579-1.
Service specifications are produced in three stages and according to the method specified in ETS 300 387. ISO/IEC 13869:2003 contains the stage 3 specification for the Q reference point and satisfies the requirements identified by the stage 1 and stage 2 specifications in ISO/IEC 13865.
The signalling protocol for SS-CT operates on top of the signalling protocol for basic circuit switched call control, as specified in ISO/IEC 11572, and uses certain aspects of the generic procedures for the control of supplementary services specified in ISO/IEC 11582.
ISO/IEC 13869:2003 also specifies additional signalling protocol requirements for the support of interactions at the Q reference point between Call Transfer and other supplementary services and ANFs.
ISO/IEC 13869:2003 is applicable to PINXs which can interconnect to form a PISN.
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Foreword
Introduction
1 Scope
2 Conformance
3 Normative references
4 Definitions
4.1 External definitions
4.2 Other definitions
4.2.1 End PINX
4.2.2 Primary PINX
4.2.3 Redirection number
4.2.4 Secondary PINX
4.2.5 Transferring PINX
5 Acronyms
6 Signalling protocol for the support of SS-CT
6.1 SS-CT description
6.2 SS-CT operational requirements
6.2.1 Provision/Withdrawal
6.2.2 Requirements on a Transferring PINX
6.2.3 Requirements on a Primary PINX
6.2.4 Requirements on a Secondary PINX
6.2.5 Requirements on a Transit PINX
6.3 SS-CT coding requirements
6.3.1 Operations
6.3.2 Information elements
6.3.2.1 Facility information element
6.3.2.2 Information elements embedded in the Facility information element
6.3.2.3 Other information elements
6.3.3 Messages
6.4 SS-CT state definitions
6.4.1 States at a Transferring PINX
6.4.1.1 CT-Idle
6.4.1.2 CT-Await-Answer-From-User-C
6.4.1.3 CT-Await-Identify-Response
6.4.1.4 CT-Await-Initiate-Response
6.4.2 States at a Primary PINX
6.4.2.1 CT-Idle
6.4.2.2 CT-Await-Setup-Response
6.4.2.3 CT-Await-Connect
6.4.3 States at a Secondary PINX
6.4.3.1 CT-Idle
6.4.3.2 CT-Await-Setup
6.5 SS-CT signalling procedures
6.5.1 Actions at a Transferring PINX
6.5.1.1 Normal procedures for transfer by join
6.5.1.2 Exceptional procedures for transfer by join
6.5.1.3 Normal procedures for transfer by rerouteing
6.5.1.4 Exceptional procedures for transfer by rerouteing
6.5.2 Actions at a Primary PINX
6.5.2.1 Normal procedures for transfer by join
6.5.2.2 Exceptional procedures for transfer by join
6.5.2.3 Normal procedures for transfer by rerouteing
6.5.2.4 Exceptional procedures for transfer by rerouteing
6.5.3 Actions at a Secondary PINX
6.5.3.1 Normal procedures for transfer by join
6.5.3.2 Exceptional procedures for transfer by join
6.5.3.3 Normal procedures for transfer by rerouteing
6.5.3.4 Exceptional procedures for transfer by rerouteing
6.5.4 Actions at a Transit PINX
6.5.5 Subsequent actions at a Primary and a Secondary PINX
6.6 SS-CT impact of interworking with public ISDNs
6.6.1 Actions at a Gateway PINX
6.6.1.1 Impact of interworking if User A is in the PISN
6.6.1.2 Impact of interworking if a PISN User is transferred by the public ISDN
6.6.2 Actions at other types of PINX
6.7 SS-CT impact of interworking with non-ISDNs
6.7.1 Actions at a Gateway PINX
6.7.1.1 Transfer within the PISN
6.7.1.2 Transfer within the non-ISDN
6.7.1.3 Cooperation with a non-ISDN in providing transfer by rerouteing
6.7.2 Actions at other types of PINX
6.8 Protocol Interactions between SS-CT and other supplementary services and ANFs
6.8.1 Calling Name Identification Presentation (SS-CNIP)
6.8.2 Connected Name Identification Presentation (SS-CONP)
6.8.3 Completion of Calls to Busy Subscribers (SS-CCBS)
6.8.4 Completion of Calls on No Reply (SS-CCNR)
6.8.5 Call Forwarding Unconditional (SS-CFU)
6.8.5.1 Actions at a Transferring PINX for join
6.8.6 Call Forwarding Busy (SS-CFB)
6.8.6.1 Actions at a Transferring PINX for join
6.8.7 Call Forwarding No Reply (SS-CFNR)
6.8.7.1 Actions at a Transferring PINX for rerouteing and SS-CFNR Originating PINX
6.8.7.2 Actions at a Transferring PINX for join or rerouteing and SS-CFNR Originating PINX
6.8.7.3 Actions at a Secondary PINX for rerouteing and SS-CFNR Served User PINX
6.8.7.4 Actions at a Secondary PINX for rerouteing and SS-CFNR Served User and Rerouteing PINX
6.8.7.5 Actions at a Secondary PINX for join and SS-CFNR Served User and Rerouteing PINX
6.8.7.6 Actions at a Transferring PINX for join
6.8.7.7 Actions at a Primary PINX for join
6.8.8 Call Deflection (SS-CD)
6.8.9 Path Replacement (ANF-PR)
6.8.9.1 Actions at an ANF-PR Requesting PINX
6.8.9.1.1 Invocation of Call transfer
6.8.9.1.2 Initiation of ANF-PR during Call Transfer
6.8.9.2 Actions at an ANF-PR Cooperating PINX
6.8.9.2.1 Invocation of Call Transfer
6.8.9.2.2 Initiation of ANF-PR during Call Transfer
6.9 SS-CT Parameter values (Timers)
6.9.1 Timer T1
6.9.2 Timer T2
6.9.3 Timer T3
6.9.4 Timer T4
Annex A(normative)Protocol Implementation Conformance Statement (PICS) proforma
A.1 Introduction
A.2 Instructions for completing the PICS proforma
A.2.1 General structure of the PICS proforma
A.2.2 Additional information
A.2.3 Exceptional information
A.3 PICS proforma for ISO/IEC 13869
A.3.1 Implementation identification
A.3.2 Protocol summary
A.3.3 General
A.3.4 Procedures for SS-CT-Join
A.3.5 Additional procedures for SS-CT-Rerouteing
A.3.6 Coding
A.3.7 Interactions between SSCT and SSCFNR/SSCD
A.3.8 Interactions between SSCT and ANFPR
A.3.9 Timers
A.3.10 Interactions between SSCT and SSCFU/SS-CDI
A.3.11 Interactions between SSCT and SSCFB
Annex B(informative)Imported ASN.1 definitions
Annex C(informative)Examples of message sequences
C.1 Example message sequence for normal operations of call transfer by join, both calls active
C.2 Example message sequence for call transfer by join, one call alerting
C.3 Example message sequence for normal operation of call transfer by rerouteing
C.4 Example message sequence for normal operation of call transfer by rerouteing, one call alerting
Annex D(informative)Specification and Description Language (SDL) representation of procedures
D.1 SDL Representation of SS-CT at a Transferring PINX
D.2 SDL Representation of SS-CT at a Primary PINX
D.3 SDL Representation of SS-CT at a Secondary PINX
Annex E(informative)Bibliography
Annex F(normative)ASN.1 definitions according to ITU-T Recs. X.208 / X.209
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Foreword
Introduction
1 Scope
2 Conformance
3 Normative references
4 Definitions
4.1 External definitions
4.2 Other definitions
4.2.1 End PINX
4.2.2 Primary PINX
4.2.3 Redirection number
4.2.4 Secondary PINX
4.2.5 Transferring PINX
5 Acronyms
6 Signalling protocol for the support of SS-CT
6.1 SS-CT description
6.2 SS-CT operational requirements
6.2.1 Provision/Withdrawal
6.2.2 Requirements on a Transferring PINX
6.2.3 Requirements on a Primary PINX
6.2.4 Requirements on a Secondary PINX
6.2.5 Requirements on a Transit PINX
6.3 SS-CT coding requirements
6.3.1 Operations
6.3.2 Information elements
6.3.2.1 Facility information element
6.3.2.2 Information elements embedded in the Facility information element
6.3.2.3 Other information elements
6.3.3 Messages
6.4 SS-CT state definitions
6.4.1 States at a Transferring PINX
6.4.1.1 CT-Idle
6.4.1.2 CT-Await-Answer-From-User-C
6.4.1.3 CT-Await-Identify-Response
6.4.1.4 CT-Await-Initiate-Response
6.4.2 States at a Primary PINX
6.4.2.1 CT-Idle
6.4.2.2 CT-Await-Setup-Response
6.4.2.3 CT-Await-Connect
6.4.3 States at a Secondary PINX
6.4.3.1 CT-Idle
6.4.3.2 CT-Await-Setup
6.5 SS-CT signalling procedures
6.5.1 Actions at a Transferring PINX
6.5.1.1 Normal procedures for transfer by join
6.5.1.2 Exceptional procedures for transfer by join
6.5.1.3 Normal procedures for transfer by rerouteing
6.5.1.4 Exceptional procedures for transfer by rerouteing
6.5.2 Actions at a Primary PINX
6.5.2.1 Normal procedures for transfer by join
6.5.2.2 Exceptional procedures for transfer by join
6.5.2.3 Normal procedures for transfer by rerouteing
6.5.2.4 Exceptional procedures for transfer by rerouteing
6.5.3 Actions at a Secondary PINX
6.5.3.1 Normal procedures for transfer by join
6.5.3.2 Exceptional procedures for transfer by join
6.5.3.3 Normal procedures for transfer by rerouteing
6.5.3.4 Exceptional procedures for transfer by rerouteing
6.5.4 Actions at a Transit PINX
6.5.5 Subsequent actions at a Primary and a Secondary PINX
6.6 SS-CT impact of interworking with public ISDNs
6.6.1 Actions at a Gateway PINX
6.6.1.1 Impact of interworking if User A is in the PISN
6.6.1.2 Impact of interworking if a PISN User is transferred by the public ISDN
6.6.2 Actions at other types of PINX
6.7 SS-CT impact of interworking with non-ISDNs
6.7.1 Actions at a Gateway PINX
6.7.1.1 Transfer within the PISN
6.7.1.2 Transfer within the non-ISDN
6.7.1.3 Cooperation with a non-ISDN in providing transfer by rerouteing
6.7.2 Actions at other types of PINX
6.8 Protocol Interactions between SS-CT and other supplementary services and ANFs
6.8.1 Calling Name Identification Presentation (SS-CNIP)
6.8.2 Connected Name Identification Presentation (SS-CONP)
6.8.3 Completion of Calls to Busy Subscribers (SS-CCBS)
6.8.4 Completion of Calls on No Reply (SS-CCNR)
6.8.5 Call Forwarding Unconditional (SS-CFU)
6.8.5.1 Actions at a Transferring PINX for join
6.8.6 Call Forwarding Busy (SS-CFB)
6.8.6.1 Actions at a Transferring PINX for join
6.8.7 Call Forwarding No Reply (SS-CFNR)
6.8.7.1 Actions at a Transferring PINX for rerouteing and SS-CFNR Originating PINX
6.8.7.2 Actions at a Transferring PINX for join or rerouteing and SS-CFNR Originating PINX
6.8.7.3 Actions at a Secondary PINX for rerouteing and SS-CFNR Served User PINX
6.8.7.4 Actions at a Secondary PINX for rerouteing and SS-CFNR Served User and Rerouteing PINX
6.8.7.5 Actions at a Secondary PINX for join and SS-CFNR Served User and Rerouteing PINX
6.8.7.6 Actions at a Transferring PINX for join
6.8.7.7 Actions at a Primary PINX for join
6.8.8 Call Deflection (SS-CD)
6.8.9 Path Replacement (ANF-PR)
6.8.9.1 Actions at an ANF-PR Requesting PINX
6.8.9.1.1 Invocation of Call transfer
6.8.9.1.2 Initiation of ANF-PR during Call Transfer
6.8.9.2 Actions at an ANF-PR Cooperating PINX
6.8.9.2.1 Invocation of Call Transfer
6.8.9.2.2 Initiation of ANF-PR during Call Transfer
6.9 SS-CT Parameter values (Timers)
6.9.1 Timer T1
6.9.2 Timer T2
6.9.3 Timer T3
6.9.4 Timer T4
Annex A(normative)Protocol Implementation Conformance Statement (PICS) proforma
A.1 Introduction
A.2 Instructions for completing the PICS proforma
A.2.1 General structure of the PICS proforma
A.2.2 Additional information
A.2.3 Exceptional information
A.3 PICS proforma for ISO/IEC 13869
A.3.1 Implementation identification
A.3.2 Protocol summary
A.3.3 General
A.3.4 Procedures for SS-CT-Join
A.3.5 Additional procedures for SS-CT-Rerouteing
A.3.6 Coding
A.3.7 Interactions between SSCT and SSCFNR/SSCD
A.3.8 Interactions between SSCT and ANFPR
A.3.9 Timers
A.3.10 Interactions between SSCT and SSCFU/SS-CDI
A.3.11 Interactions between SSCT and SSCFB
Annex B(informative)Imported ASN.1 definitions
Annex C(informative)Examples of message sequences
C.1 Example message sequence for normal operations of call transfer by join, both calls active
C.2 Example message sequence for call transfer by join, one call alerting
C.3 Example message sequence for normal operation of call transfer by rerouteing
C.4 Example message sequence for normal operation of call transfer by rerouteing, one call alerting
Annex D(informative)Specification and Description Language (SDL) representation of procedures
D.1 SDL Representation of SS-CT at a Transferring PINX
D.2 SDL Representation of SS-CT at a Primary PINX
D.3 SDL Representation of SS-CT at a Secondary PINX
Annex E(informative)Bibliography
Annex F(normative)ASN.1 definitions according to ITU-T Recs. X.208 / X.209