ISO/IEC 19459:2001
(Main)Information technology — Telecommunications and information exchange between systems — Private Integrated Services Network — Specification, functional model and information flows — Single Step Call Transfer Supplementary Service
Information technology — Telecommunications and information exchange between systems — Private Integrated Services Network — Specification, functional model and information flows — Single Step Call Transfer Supplementary Service
This International Standard specifies the Supplementary Service (SS) Single Step Call Transfer (SSCT), which is applicable to various basic services supported by Private Integrated Services Networks (PISN). Basic services are specified in ISO/IEC 11574. SS-SSCT is a supplementary service that enables an SSCT user, user A, to transform an existing call between user A and user B into a new call between user B and a user C whereby user A does not have a call established with user C prior to call transfer. Supplementary service specifications are produced in three stages, according to the method described in ETS 300 387. This International Standard contains the stage 1 and stage 2 specifications of SS-SSCT. The stage 1 specification (clause 6) specifies the general feature principles and capabilities. The stage 2 specification (clause 7) identifies the Functional Entities involved in the supplementary service and the information flows between them.
Technologies de l'information — Télécommunications et échange d'information entre systèmes — Réseau privé à intégration de services — Spécifications, modèle fonctionnel et flux d'informations — Service supplémentaire de transfert d'appel à pas unique
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INTERNATIONAL ISO/IEC
STANDARD 19459
First edition
2001-05-01
Information technology —
Telecommunications and information
exchange between systems — Private
Integrated Services Network —
Specification, functional model and
information flows — Single Step Call
Transfer Supplementary Service
Technologies de l'information — Télécommunications et échange
d'information entre systèmes — Réseau privé à intégration de services —
Spécifications, modèle fonctionnel et flux d'informations — Service
supplémentaire de transfert d'appel à pas unique
Reference number
ISO/IEC 19459:2001(E)
©
ISO/IEC 2001
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ISO/IEC 19459:2001(E)
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ISO/IEC 19459:2001(E)
Contents Page
Foreword v
Introduction vi
1 Scope 1
2 Conformance 1
3 Normative references 1
4 Terms and definitions 2
4.1 External definitions 2
4.2 Other definitions 2
4.2.1 Additional network feature (ANF) 2
4.2.2 Original Call, Original Connection 2
4.2.3 New Call, New Connection 2
4.2.4 User A, Transferring User 2
4.2.5 User B, Transferred User 2
4.2.6 User C, Transferred-To User 2
5 List of acronyms 3
6 SS-SSCT stage 1 specification 3
6.1 Description 3
6.1.1 General description 3
6.1.2 Qualifications on applicability to telecommunication services 3
6.2 Procedure 3
6.2.1 Provision/withdrawal 3
6.2.2 Normal procedures 3
6.2.3 Exceptional procedures 3
6.3 Interaction with other supplementary services and ANFs 4
6.3.1 Calling Line Identification Presentation (SS-CLIP) 4
6.3.2 Connected Line Identification Presentation (SS-COLP) 4
6.3.3 Calling/Connected Line Identification Restriction (SS-CLIR) 4
6.3.4 Calling Name Identification Presentation (SS-CNIP) 4
6.3.5 Calling Name Identification Restriction (SS-CNIR) 4
6.3.6 Connected Name Identification Presentation (SS-CONP) 4
6.3.7 Completion of Call to Busy Subscriber (SS-CCBS) 4
6.3.8 Completion of Call on No Reply (SS-CCNR) 4
6.3.9 Call Transfer (SS-CT) 4
6.3.10 Call Forwarding Unconditional (SS-CFU) 4
6.3.11 Call Forwarding Busy (SS-CFB) 4
6.3.12 Call Forwarding No Reply (SS-CFNR) 4
6.3.13 Call Deflection (SS-CD) 4
6.3.14 Path Replacement (ANF-PR) 4
6.3.15 Call Offer (SS-CO) 4
6.3.16 Call Intrusion (SS-CI) 4
6.3.17 Do not Disturb (SS-DND) 5
6.3.18 Do not Disturb Override (SS-DNDO) 5
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ISO/IEC 19459:2001(E)
6.3.19 Advice of Charge (SS-AOC) 5
6.3.20 Recall (SS-RE) 5
6.3.21 Call Interception (ANF-CINT) 6
6.3.22 Transit Counter (ANF-TC) 6
6.3.23 Route Restriction Class (ANF-RRC) 6
6.3.24 Message Waiting Indication (SS-MWI) 6
6.3.25 Wireless Terminal Location Registration (SS-WTLR) 6
6.3.26 Wireless Terminal Incoming Call (ANF-WTMI) 6
6.3.27 Wireless Terminal Outgoing Call (ANF-WTMO) 6
6.3.28 Wireless Terminal Authentication of a CTM User (SS-WTAT) 6
6.3.29 Wireless Terminal Authentication of the PISN (SS-WTAN) 6
6.3.30 Private User Mobility Incoming Call (ANF-PUMI) 6
6.3.31 Private User Mobility Outgoing Call (ANF-PUMO) 6
6.3.32 Private User Mobility Registration (SS-PUMR) 6
6.3.33 CommonInformation(ANF-CMN) 6
6.3.34 Call Priority Interruption (Protection) (SS-CPI(P)) 6
6.4 Interworking considerations 6
6.4.1 User Band/orUserCinanothernetwork 6
6.4.2 User A in another network 7
6.5 Overall SDL 8
7 SS-SSCT stage 2 specification 9
7.1 Functional model 9
7.1.1 Functional model description 9
7.1.2 Description of functional entities 10
7.1.3 Relationship of functional model to Basic Call functional model 10
7.2 Information flows 11
7.2.1 Definition of information flows 11
7.2.2 Examples of information flow sequences 14
7.3 Functional Entity actions 18
7.3.1 Functional Entity actions of FE1 18
7.3.2 Functional Entity actions of FE2 18
7.3.3 Functional Entity actions of FE3 18
7.3.4 Functional Entity actions of FE4 18
7.3.5 Functional Entity actions of FE5 19
7.3.6 Functional Entity actions of FE6 19
7.3.7 Functional Entity actions of FE7 19
7.4 Functional Entity behaviour 20
7.4.1 Behaviour of FE1 20
7.4.2 Behaviour of FE2 21
7.4.3 Behaviour of FE3 22
7.4.4 Behaviour of FE4 24
7.4.5 Behaviour of FE5 25
7.4.6 Behaviour of FE6 26
7.4.7 Behaviour of FE7 27
7.5 Allocation of functional entities to physical locations 28
Annex A - Difference between Single Step Call Transfer and Call Transfer by Rerouting 29
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ISO/IEC 19459:2001(E)
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the
specialized system for worldwide standardization. National bodies that are members of ISO or IEC participate in the
development of International Standards through technical committees established by the respective organization to deal with
particular fields of technical activity. ISO and IEC technical committees collaborate in fields of mutual interest. Other
international organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the work.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1. Draft
International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the national bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights.
ISO and IEC shall not be held responsible for identifying any or all such patent rights.
International Standard ISO/IEC 19459 was prepared by ECMA (as ECMA-299) and was adopted, under a special “fast-track
procedure”, by Joint Technical Committee ISO/IEC JTC 1, Information technology, in parallel with its approval by national
bodies of ISO and IEC.
Annex A of this International Standard is for information only.
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ISO/IEC 19459:2001(E)
Introduction
This International Standard is one of a series of Standards defining services and signalling procedures applicable to Private
Integrated Services Networks (PISNs). The series uses the ISDN concepts as developed by ITU-T and conforms to the
framework of International Standards for Open Systems Interconnection as defined by ISO/IEC.
This International Standard specifies the Single Step Call Transfer (SSCT) supplementary service.
This International Standard is based upon the practical experience of ECMA member companies and the results of their active
and continuous participation in the work of ISO/IEC JTC 1, ITU-T, ETSI and other international and national standardization
bodies. It represents a pragmatic and widely based consensus.
There is currently no equivalent service specified by ITU-T or ETSI for public ISDN.
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INTERNATIONAL STANDARD ISO/IEC 19459:2001(E)
Information technology — Telecommunications and information exchange between
systems — Private Integrated Services Network — Specification, functional model
and information flows — Single Step Call Transfer Supplementary Service
1Scope
This International Standard specifies the Supplementary Service (SS) Single Step Call Transfer (SSCT), which is applicable to
various basic services supported by Private Integrated Services Networks (PISN). Basic services are specified in ISO/IEC
11574.
SS-SSCT is a supplementary service that enables an SSCT user, user A, to transform an existing call between user A and user
B into a new call between user B and a user C whereby user A does not have a call established with user C prior to call
transfer.
Supplementary service specifications are produced in three stages, according to the method described in ETS 300 387. This
International Standard contains the stage 1 and stage 2 specifications of SS-SSCT. The stage 1 specification (clause 6)
specifies the general feature principles and capabilities. The stage 2 specification (clause 7) identifies the Functional Entities
involved in the supplementary service and the information flows between them.
2 Conformance
In order to conform to this International Standard, a stage 3 standard shall specify signalling protocols and equipment
behaviour that are capable of being used in a PISN which supports the supplementary service specified in this International
Standard. This means that, to claim conformance, a stage 3 standard is required to be adequate for the support of those aspects
of clause 6 (stage 1) and clause 7 (stage 2) which are relevant to the interface or equipment to which the stage 3 standard
applies.
3 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this
International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not
apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of
applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the
normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards.
ISO/IEC 11571:1998, Information technology - Telecommunications and information exchange between systems - Private
Integrated Services Networks - Addressing.
ISO/IEC 11574:2000, Information technology - Telecommunications and information exchange between systems - Private
Integrated Services Network - Circuit-mode 64 kbit/s bearer services - Service description, functional capabilities and
information flows.
ISO/IEC 11579-1:1994, Information technology - Telecommunications and information exchange between systems - Private
integrated services network - Part 1: Reference configuration for PISN Exchanges (PINX).
ISO/IEC 13864:1995, Information technology - Telecommunications and information exchange between systems - Private
Integrated Services Network - Specification, functional model and information flows - Name identification supplementary
services.
ISO/IEC 13865:1995, Information technology - Telecommunications and information exchange between systems - Private
Integrated Services Network - Specification, functional model and information flows - Call transfer supplementary service.
ISO/IEC 13869:1995, Information technology - Telecommunications and information exchange between systems - Private
Integrated Services Network - Inter-exchange signalling protocol - Call transfer supplementary service.
ISO/IEC 14136:1995, Information technology - Telecommunications and information exchange between systems - Private
Integrated Services Network - Specification, functional model and information flows - Identification supplementary services.
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ISO/IEC 19459:2001(E)
ETS 300 387:1994, Private Telecommunication Network (PTN); Method for the specification of basic and supplementary
services.
ITU-T Rec. I.112:1993, Vocabulary of terms for ISDNs.
ITU-T Rec. I.210:1993, Principles of telecommunication services supported by an ISDN and the means to describe them.
ITU-T Rec. Z.100:1999, Specification and description language (SDL).
4 Terms and definitions
For the purposes of this International Standard, the following terms and definitions apply.
4.1 External definitions
This International Standard uses the following terms defined in other documents:
– Basic service (ITU-T Rec. I.210)
– Call (Basic call) (ISO/IEC 11574)
– PISN Number (ISO/IEC 11571)
– Private Integrated Services Network (PISN) (ISO/IEC 11579-1)
– Private Integrated services Network eXchange (PINX) (ISO/IEC 11579-1)
– Service (ITU-T Rec. I.112)
– Signalling (ITU-T Rec. I.112)
– Supplementary Service (ITU-T Rec. I.210)
– User (ISO/IEC 11574)
This International Standard refers to the following basic call Functional Entities (FE) defined in ISO/IEC 11574:
– Call Control (CC)
– Call Control Agent (CCA)
This International Standard refers to the following basic call inter-FE relationships defined in ISO/IEC 11574:
– r1
– r2
– r3
This International Standard refers to the following basic call information flows defined in ISO/IEC 11574:
– SETUP request/indication
– SETUP response/confirm
– RELEASE request/indication
– REPORT request/indication
– INFORMATION request/indication
This International Standard refers to the following service elements defined for basic call control in ISO/IEC 11574:
– Call History
4.2 Other definitions
4.2.1 Additional network feature (ANF) : A capability provided by a PISN, not generally directly to a user, over and
above that of the Basic call.
4.2.2 Original Call, Original Connection : The call established between user A and user B.
4.2.3 New Call, New Connection : The new call established between user B and user C.
4.2.4 User A, Transferring User : The served user, i.e. the user requesting Single Step Call Transfer.
4.2.5 User B, Transferred User : The other user in user A's original call.
4.2.6 User C, Transferred-To User : The user to whom the call is transferred to.
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ISO/IEC 19459:2001(E)
5 Listofacronyms
ANF Additional Network Feature
CC Call Control (Functional Entity)
CCA Call Control Agent (Functional Entity)
FE Functional Entity
FEA Functional Entity Action
ISDN Integrated Services Digital Network
PINX Private Integrated services Network eXchange
PISN Private Integrated Services Network
SDL Specification and Description Language
SS Supplementary Service
SS-SSCT Supplementary Service Single Step Call Transfer
TE Terminal Equipment
6 SS-SSCT stage 1 specification
6.1 Description
6.1.1 General description
SS-SSCT is a service which enables a served user (user A) to transfer an active call (with user B) to a user (user C) which has
no call established either to user A or to user B. The active call can either be an incoming call to user A or an outgoing call
from user A.
On successful completion of SS-SSCT user B and user C can communicate with each other and user A will no longer be
involved in a call with user B or user C.
6.1.2 Qualifications on applicability to telecommunication services
SS-SSCT is applicable to all basic services defined in ISO/IEC 11574.
6.2 Procedure
6.2.1 Provision/withdrawal
SS-SSCT shall be generally available to all PISN users with the ability to invoke it.
6.2.2 Normal procedures
6.2.2.1 Activation, deactivation and interrogation
Not applicable.
6.2.2.2 Invocation and operation
User A, having an active call with user B, may invoke SS-SSCT to transfer the active call to a user (user C) which has no call
established either to user A or to user B. The Original call can either be an incoming call to user A or an outgoing call from
user A.
If, after invoking SS-SSCT, the number of the transferred-to user C supplied by user A is not complete, the transferred user B
is requested to complete the number of the transferred-to user C.
It shall not be necessary to place the Original call on hold prior to invocation of SS-SSCT, although the call may be held. The
result of successful SS-SSCT shall be a new call between the transferred user B and the transferred-to user C. Both users B and
C may be informed of the transfer, and the name and the number of the other user if available and not subject to restriction.
User A is no longer involved in the communication.
User A may decide when the original connection shall be released: either upon the new connection starting ringing or upon
being through connected.
6.2.3 Exceptional procedures
6.2.3.1 Activation, deactivation, and interrogation
Not applicable.
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ISO/IEC 19459:2001(E)
6.2.3.2 Invocation and operation
SS-SSCT shall be rejected if the interconnection of user B and user C is not permitted. If the new call fails or if SS-SSCT is
rejected user A shall be informed and the Original call between user A and user B shall be unaffected.
Failure of the new call also includes inter-digit timeout due to user B failing to complete the number of user C in a timely
manner.
6.3 Interaction with other supplementary services and ANFs
Interactions with other supplementary services and ANFs for which PISN standards were available at the time of publication of
this International Standard are specified below.
6.3.1 Calling Line Identification Presentation (SS-CLIP)
No interaction.
6.3.2 Connected Line Identification Presentation (SS-COLP)
No interaction.
6.3.3 Calling/Connected Line Identification Restriction (SS-CLIR)
User B's restriction requirements from the original call shall be used to restrict the presentation of user B's number to user C in
a transferred call.
6.3.4 Calling Name Identification Presentation (SS-CNIP)
No interaction.
6.3.5 Calling Name Identification Restriction (SS-CNIR)
User B's restriction requirements from the original call shall be used to restrict the presentation of user B's name to user C in a
transferred call.
6.3.6 Connected Name Identification Presentation (SS-CONP)
No interaction.
6.3.7 Completion of Call to Busy Subscriber (SS-CCBS)
No interaction.
6.3.8 Completion of Call on No Reply (SS-CCNR)
No interaction.
6.3.9 Call Transfer (SS-CT)
SS-SSCT shall not be initiated during SS-CT.
SS-CT shall not be initiated during SS-SSCT.
6.3.10 Call Forwarding Unconditional (SS-CFU)
The new call can be subject of call forwarding unconditional.
6.3.11 Call Forwarding Busy (SS-CFB)
The new call can be subject of call forwarding busy.
6.3.12 Call Forwarding No Reply (SS-CFNR)
The new call can be subject of call forwarding on no reply.
6.3.13 Call Deflection (SS-CD)
The new call can be subject of call deflection.
6.3.14 Path Replacement (ANF-PR)
No interaction.
NOTE 1 - Path Replacement may be invoked as a direct consequence of performing single step call transfer.
6.3.15 Call Offer (SS-CO)
No interaction.
6.3.16 Call Intrusion (SS-CI)
User A shall not be able to invoke SS-SSCT during the impending intrusion state or the intrusion state.
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6.3.17 Do not Disturb (SS-DND)
No interaction.
6.3.18 Do not Disturb Override (SS-DNDO)
No interaction.
6.3.19 Advice of Charge (SS-AOC)
6.3.19.1 Advice of Charge: charging information at call set-up time (AOC-S)
If, prior to transfer, user A was receiving AOC-S information for the original call, at the time of single step call transfer,
SS-AOC-S shall be stopped. If at the time of the single step call transfer it is decided that user A will not be charged for the
call prior to transfer, then the specific rate "free of charge from the beginning" shall be given to user A prior to stopping
SS-AOC-S.
User A shall not be allowed to invoke SS-AOC-S on a call resulting from transfer.
After transfer, SS-AOC-S may be invoked for user B either automatically or on request from the user. It shall not be possible to
invoke SS-AOC-S until after user C has answered. AOC-S information in that case may contain charges incurred prior to
transfer (as specific rate “flat rate”).
6.3.19.2 Advice of Charge: charging information during the call (AOC-D)
If, prior to transfer, user A was receiving AOC-D information for the original call, then at the time of transfer, the (sub)total
charges shall be sent to user A and SS-AOC-D shall be stopped. If at the time of the transfer it is decided that user A will not
be charged for the call prior to transfer, then the (sub)total charges sent to user A will have value "0" or "free of charge".
NOTE 2 - The charges will be total charges if user A is not charged for the call resulting from transfer and sub-total charges otherwise.
User A shall not be allowed to invoke SS-AOC-D on a call resulting from transfer.
After transfer SS-AOC-D may be invoked for user B (or C) either automatically or on request from the user. It shall not be
possible to invoke SS-AOC-D until after user C has answered. If the user for which SS-AOC-D is invoked is to be charged for
the call resulting from transfer, AOC-D information in that case may contain charges incurred prior to transfer.
6.3.19.3 Advice of Charge: charging information at the end of the call (AOC-E)
If, prior to transfer, user A was due to receive AOC-E information for the original call, and if user A continues to be charged
for the call resulting from transfer, then at the time of transfer, as an implementation option, SS-AOC-E for user A may remain
in progress. If SS-AOC-E remains in progress when the call resulting from transfer is released, AOC-E information (i.e. the
total charges incurred for the call prior to transfer and for the call resulting from transfer) shall be sent to user A and AOC-E
shall be stopped. If SS-AOC-E does not remain in progress, then at the time of transfer, user A shall be advised that final
charge information is not available.
With the invocation of Call Transfer, user A may provide an identifier. If user A is to receive AOC-E information then,
together with the AOC-E information, this identifier shall be returned by the PISN to user A.
If, prior to transfer, user A was due to receive AOC-E information for the original call, and if user A does not continue to be
charged for the call resulting from transfer, then at the time of transfer, (i.e. when the call to user A is cleared) SS-AOC-E for
user A shall be stopped and AOC-E information shall be sent to user A.
NOTE 3 - AOC-E information sent in this situation to user A can be either:
� the total charges incurred for the call prior to transfer (if user A is charged for that part of the call);
� total charges with value "0" or "free of charge" if at the time of the transfer the PISN decides that user B or user C is to be charged for
the part of the call prior to transfer also.
User A shall not be allowed to invoke AOC-E only for the call resulting from transfer.
After transfer AOC-E may be invoked for user B (or C) either automatically or on request from the user. It shall not be possible
to invoke SS-AOC-E until after user C has answered. If the user for which SS-AOC-E is invoked is to be charged for the call
resulting from transfer, AOC-E information at the end of the call to user B (or C) may contain charges incurred prior to
transfer.
6.3.20 Recall (SS-RE)
No interaction.
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ISO/IEC 19459:2001(E)
6.3.21 Call Interception (ANF-CINT)
A call resulting from transfer can be subject to interception if it continues to alert or wait on busy at the transferred-to user
(user C) without reply.
6.3.22 Transit Counter (ANF-TC)
ANF-TC may apply to the establishment of the new connection during single step call transfer.
6.3.23 Route Restriction Class (ANF-RRC)
No interaction.
6.3.24 Message Waiting Indication (SS-MWI)
No interaction.
6.3.25 Wireless Terminal Location Registration (SS-WTLR)
No interaction.
6.3.26 Wireless Terminal Incoming Call (ANF-WTMI)
No interaction.
6.3.27 Wireless Terminal Outgoing Call (ANF-WTMO)
No interaction.
6.3.28 Wireless Terminal Authentication of a CTM User (SS-WTAT)
No interaction
6.3.29 Wireless Terminal Authentication of the PISN (SS-WTAN)
No interaction.
6.3.30 Private User Mobility Incoming Call (ANF-PUMI)
No interaction.
6.3.31 Private User Mobility Outgoing Call (ANF-PUMO)
No interaction.
6.3.32 Private User Mobility Registration (SS-PUMR)
No interaction.
6.3.33 Common Information (ANF-CMN)
No interaction.
NOTE 4 - ANF-CMN users involved in a call resulting from Single Step Call Transfer may exchange Common Information subsequent to
transfer.
6.3.34 Call Priority Interruption (Protection) (SS-CPI(P))
No interaction.
6.4 Interworking considerations
The Single Step Call Transfer may take place when one or both of the calls involves interworking with a public ISDN or a
public or private non-ISDN.
6.4.1 User B and/or User C in another network
Since the execution of the Single Step Call Transfer service need only involve the interconnection within the PISN of one end
of each of the two connections (the original or/and the new call), the nature of the network (ISDN or non-ISDN) containing
user B or user C makes no difference to the operation of the service as seen by user A.
The PISN shall pass on any notifications associated with the Single Step Call Transfer to the other network if the other network
is capable of receiving this information, the possibilities being the notifications that Single Step Call Transfer has taken place,
the name and number (if appropriate) of the other user and the other user's subaddress and compatibility information.
In the case where user B and user C are in the same network, the PISN may be able to co-operate with that network in order to
effect Single Step Call Transfer in that network if that network supports a similar service (e.g. Call Transfer).
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ISO/IEC 19459:2001(E)
6.4.2 User A in another network
The PISN shall accept Single Step Call Transfer notifications from another network and pass them on to the PISN user. Single
Step Call Transfer notifications include notifications that transfer has taken place, the name and number of the other user and
the other user's subaddress and compatibility information. Where this information is not provided, a PISN user will have to rely
on in-band information.
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ISO/IEC 19459:2001(E)
6.5 Overall SDL
Figure 1 contains the dynamic description of SS-SSCT using the Specification and Description Language (SDL) defined in
ITU-T Rec. Z.100 (1993). The SDL process represents the behaviour of the PISN in providing SS-SSCT.
Input signals from the left and output signals to the left represent primitives from and to user A.
Input signals from the right and output signals to the right represent primitives from and to user B and user C.
Idle
Active Call
between User A
and User B
SSCT
request by
User A
User C's
NO
number
complete to
route
User B is requested
to post-dial number
YES
of User C
initiate call
establishment to
digits (User
repeated until User C
C's number)
User C's
YES
sent by User B
User B to be
number is
notified
complete
Attempt to
connect User B to NO Notify User B
User C
YES
User C to be
NO
Transfer
notified
successful?
Notify User
NO
C
YES
Get cause
Clear original
Transfer Transfer
connection
reject successful
towards User A
Idle Idle
Figure 1 - SS-SSCT, Overall SDL
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ISO/IEC 19459:2001(E)
7 SS-SSCT stage 2 specification
A stage 3 standard for SS-SSCT shall be capable of supporting the functional breakdown of the service specified in this clause.
7.1 Functional model
7.1.1 Functional model description
The functional model shall comprise the following Functional Entities:
FE1 Single Step Transfer Invoke
FE2 Single Step Transfer Co-ordinate
FE3 Single Step Transfer Execute
FE4 Single Step Transfer Detection
FE5 Single Step Transfer Complete Receive
FE6 Single Step Transfer Notification Receive and Provision of complete transferred-to number
FE7 Single Step Transfer Notification Receive
The following functional relationships shall exist between these FEs:
rr between FE1 and FE2
rs between FE2 and FE3
rt between FE3 and FE4
ru between FE3 and FE5
rv between FE5 and FE6
rw between FE4 and FE7
rx between FE6 and FE7
Figure 2 shows these FEs and relationships.
User A
FE1
rr
FE2
rs
rt
FE4
FE3
ru
rw
FE5
rv
User B
User C
rx
FE7
FE6
Figure 2 - Functional model of SS-SSCT
© ISO/IEC 2001 – All rights reserved 9
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ISO/IEC 19459:2001(E)
7.1.2 Description of functional entities
7.1.2.1 Single Step Transfer Invoke Functional Entity, FE1
This FE acts on behalf of user A. It is responsible for recognising user A's decision to effect Single Step Call Transfer.
7.1.2.2 Single Step Transfer Co-ordinate Functional Entity, FE2
This
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