SIST ETS 300 206:1997

SLOVENSKI STANDARD
SIST ETS 300 206:1997
01-november-1997
Digitalno omrežje z integriranimi storitvami (ISDN) - Dopolnilna storitev: zavrnitev
klica s preusmeritvijo (CD) - Funkcijske zmožnosti in informacijski tokovi
Integrated Services Digital Network (ISDN); Call Deflection (CD) supplementary service;
Functional capabilities and information flows
Ta slovenski standard je istoveten z: ETS 300 206 Edition 1
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
SIST ETS 300 206:1997 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 206:1997
EUROPEAN ETS 300 206
TELECOMMUNICATION December 1994
STANDARD
Source: ETSI TC-SPS Reference: T/S 22-07
ICS: 33.080
ISDN, supplementary service.
Key words:
Integrated Services Digital Network (ISDN);
Call Deflection (CD) supplementary service
Functional capabilities and information flows
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
F-06921 Sophia Antipolis CEDEX - FRANCE
Postal address:
650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Office address:
c=fr, a=atlas, p=etsi, s=secretariat - secretariat@etsi.fr
X.400: Internet:
Tel.: +33 92 94 42 00 - Fax: +33 93 65 47 16
Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the
foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 1994. All rights reserved.
New presentation - see History box

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Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Editing and Committee Support Dept." at the address shown on the title page.

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Contents
Foreword.5
1 Scope .7
2 Normative references .7
3 Definitions.8
4 Abbreviations.9
5 Description .9
6 Derivation of the functional model .9
6.1 Functional model Description.9
6.2 Description of the FEs.10
6.3 Relationship with a basic service .10
7 Information flow .10
7.1 Information flow diagram .10
7.2 Definition of individual information flows.17
7.2.1 Relationship ra.17
7.2.1.1 Contents of INFORM2 .17
7.2.1.2 Contents of INFORM7 .17
7.2.2 Relationship rb.17
7.2.2.1 Contents of INFORM1 .17
7.2.2.2 Contents of INFORM6 .18
7.2.3 Relationship rc .18
7.2.3.1 Contents of INFORM10 (rerouteing request).18
7.2.4 Relationship rd.19
7.2.4.1 Contents of INFORM9 (CD request) . 19
7.2.5 Relationship re.19
7.2.5.1 Contents of INFORM4 .19
7.2.5.2 Contents of INFORM6 .20
7.2.6 Relationship rf.20
7.2.6.1 Contents of INFORM4 .20
7.2.6.2 Contents of INFORM6 .20
7.2.7 Relationship rg.21
7.2.7.1 Contents of INFORM5 .21
8 SDL diagrams for FEs .21
8.1 FE1.22
8.2 FE2.23
8.3 FE3.27
8.4 FE4.35
8.5 FE5.43
8.6 FE6.44
8.8 FE8.51
9 Functional Entity Actions (FEAs).52
9.1 FEAs of FE1.52
9.2 FEAs of FE2.52
9.3 FEAs of FE3.52
9.4 FEAs of FE4.52
9.5 FEAs of FE5.53

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9.6 FEAs of FE6.53
9.7 FEAs of FE7.53
9.8 FEAs of FE8.54
10 Allocation of functional entities to physical locations.54
Annex A (informative): Explanatory model for multiple diversion.55
History .56

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Foreword
This European Telecommunication Standard (ETS) has been produced by the Signalling Protocols and
Switching (SPS) Technical Committee of the European Telecommunications Standards Institute (ETSI).
In accordance with CCITT Recommendation I.130, the following three level structure is used to describe
the supplementary telecommunication services as provided by European public telecommunications
operators under the pan-European Integrated Services Digital Network (ISDN):
- Stage 1: is an overall service description, from the user's standpoint;
- Stage 2: identifies the functional capabilities and information flows needed to support the service
described in stage 1; and
- Stage 3: defines the signalling system protocols and switching functions needed to implement the
service described in stage 1.
This ETS details the stage 2 aspects (functional capabilities and information flows) needed to support the
Call Deflection (CD) supplementary service. The stage 1 and stage 3 aspects are detailed in
ETS 300 202 (1994) and ETS 300 207-1 (1994), respectively.
Proposed transposition dates
Date of latest announcement of this ETS (doa): 31 March 1995
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 30 September 1995
Date of withdrawal of any conflicting National Standard (dow): 30 September 1995

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1 Scope
This European Telecommunication Standard (ETS) defines the stage two of the Call Deflection (CD)
supplementary service for the pan-European ISDN as provided by European public telecommunications
operators. Stage two identifies the functional capabilities and the information flows needed to support the
stage one service description. The stage two description also identifies user operations not directly
associated with a call (see CCITT Recommendation I.130 [3]).
This ETS is specified according to the methodology defined in CCITT Recommendation Q.65 [6].
This ETS does not formally describe the relationship between this supplementary service and the basic
call, but where possible this information is included for guidance.
In addition this ETS does not specify the requirements where the service is provided to the user via a
private ISDN. This ETS does not specify the requirements for the allocation of defined Functional Entities
(FEs) within a private ISDN; it does, however, define which FEs may be allocated to a private ISDN.
This ETS does not specify the additional requirements where the service is provided to the user via a
telecommunications network that is not an ISDN.
The CD supplementary service enables the served user to respond to an incoming call by requesting
redirection of that call to another user. The CD supplementary service can only be invoked before the
connection is established by the served user, i.e. in response to the offered call, or during the period that
the served user is being informed of the call. The served user's ability to originate calls is unaffected by the
CD supplementary service.
The CD supplementary service is applicable to all circuit-switched telecommunication services.
This ETS is applicable to the stage three standards for the ISDN, CD supplementary service. The term
"stage three" is also defined in CCITT Recommendation I.130 [3]. Where the text indicates the status of a
requirement, i.e. as strict command or prohibition, as authorization leaving freedom, as a capability or
possibility, this shall be reflected in the text of the relevant stage three standards.
Furthermore, conformance to this ETS is met by conforming to the stage three standards with the field of
application appropriate to the equipment being implemented. Therefore, no method of testing is provided
for this ETS.
2 Normative references
This ETS incorporates by dated or undated reference, provisions from other publications. These normative
references are cited at the appropriate places in the text and the publications are listed hereafter. For
dated references, subsequent amendments to or revisions of any of these publications apply to this ETS
only when incorporated in it by amendment or revision. For undated references the latest edition of the
publication referred to applies.
[1] CCITT Recommendation E.164 (1991): "Numbering plan for the ISDN era".
[2] ITU-T Recommendation I.112 (1993): "Vocabulary of terms for ISDNs".
[3] CCITT Recommendation I.130 (1988): "Method for the characterization of
telecommunication services supported by an ISDN and network capabilities of an
ISDN".
[4] ITU-T Recommendation I.210 (1993): "Principles of telecommunication services
supported by an ISDN and the means to describe them".

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[5] CCITT Recommendation Q.9 (1988): "Vocabulary of switching and signalling
terms".
[6] CCITT Recommendation Q.65 (1988): "Stage 2 of the method for the
characterization of services supported by an ISDN".
[7] CCITT Recommendation Q.71 (1988): "ISDN 64 kbit/s circuit mode switched
bearer service".
[8] CCITT Recommendation Z.100 (1988): "Specification and Description Language
(SDL)".
[9] ETS 300 202: "Integrated Services Digital Network (ISDN); Call Deflection (CD)
supplementary service: Service description".
3 Definitions
For the purposes of this ETS, the following definitions apply:
address: See CCITT Recommendation E.164 [1], clause 12.
basic service: See CCITT Recommendation Q.9 [5], definition 7018.
connected number: The ISDN number of the final destination (user C).
deflected-to address: The address to which a call has been deflected.
Deflected-To Number (DTN): The ISDN number to which a call has been deflected.
deflected-to user: A user to whom the call is redirected as a result of deflection.
deflecting number: The ISDN number of the served user.
forwarding cause: Parameter which contains the reason for the forwarding, e.g. due to the Call
Forwarding Busy (CFB) supplementary service, the Call Forwarding Unconditional (CFU) supplementary
service, the Call Forwarding No Reply (CFNR) supplementary service, or the CD supplementary service.
forwarding indicator: Indicator showing that call has been deflected and indicating whether this
information should be given to calling user.
forwarding number presentation indicator: Indicator showing whether the served user's ISDN number is
allowed to be presented to the deflected-to user.
Integrated Services Digital Network (ISDN): See ITU-T Recommendation I.112 [2], definition 308.
ISDN number: A number conforming to the numbering plan and structure specified in CCITT
Recommendation E.164 [1].
originally called number: The ISDN number of user B.
Presentation Indicator (PI): Indicator showing whether the DTN should be presented to the calling user,
as derived from the Connected Line Identification Restriction (COLR) supplementary service of user C.
served user: The user to whom the CFNR supplementary service is provided.
service; telecommunication service: See ITU-T Recommendation I.112 [2], definition 201.
supplementary service: See ITU-T Recommendation I.210 [4], subclause 2.4.

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user A: The calling user in a call which is subject to diversion.
user B: The served user when a call (from user A) is subject to the CD supplementary service.
user C: The deflected-to user in a call which is subject to the CD supplementary service. In the case of a
call which is subject to multiple diversions, user C is the deflected-to user with respect to the final call
deflecting.
4 Abbreviations
For the purposes of this ETS, the following abbreviations apply:
CC Call Control
CCA Call Control Agent
CD Call Deflection
CFB Call Forwarding Busy
CFNR Call Forwarding No Reply
CFU Call Forwarding Unconditional
COLR Connected Line Identification Restriction
DTN Deflected-to Number
FE Functional Entity
FEA Functional Entity Action
ISDN Integrated Services Digital Network
LE Local Exchange
NDUB Network Determined User Busy
NSO Notification Subscription Option
PI Presentation Indicator
PTNX Private Telecommunication Network eXchange
SDL Specification and Description Language
5 Description
The general description of the CD supplementary service is specified in ETS 300 202 [9], clause 5.
6 Derivation of the functional model
6.1 Functional model Description
The functional model for the CD supplementary service is shown in figure 1.
  �˜˜˜˜˜¿ ra �˜˜˜˜˜¿  rb �˜˜˜˜˜¿  rc �˜˜˜˜˜¿ rd �˜˜˜˜˜¿
  ‡ FE1 ˆ˜˜˜˜˜· FE2 ˆ˜˜˜˜˜˜˜· FE3 ˆ˜˜˜˜˜˜˜· FE4 ˆ˜˜˜˜˜˜· FE5 ‡
  �˜˜˜˜˜�   �˜˜˜˜˜�    �˜˜´˜˜�    �˜˜˜˜˜�   �˜˜˜˜˜�
                ‡
                ‡ re
                ‡
               �˜˜`˜˜¿ rf  �˜˜˜˜˜¿ rg �˜˜˜˜˜¿
               ‡ FE6 ˆ˜˜˜˜˜˜˜· FE7 ˆ˜˜˜˜˜˜· FE8 ‡
               �˜˜˜˜˜�    �˜˜˜˜˜�   �˜˜˜˜˜�
Figure 1: Functional model

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6.2 Description of the FEs
The FEs required by the CD supplementary service in addition to those of the basic call are as follows:
FE1: Calling user's service agent;
FE2: Calling user's service control entity (SCE);
FE3: CD execution entity;
FE4: CD detection and control entity;
FE5: Served user's service agent;
FE6: Interface controlling entity;
FE7: Deflected-to user's service control entity;
FE8: Deflected-to user's service agent.
6.3 Relationship with a basic service
Relationship with a basic service is shown in figure 2.
NOTE: The basic call model is defined in CCITT Recommendation Q.71 [7], § 2.1, with the
exception that r1 represents an outgoing call relationship from a Call Control Agent
(CCA) and r3 represents an incoming call relationship to a CCA.
�˜˜˜¿ ra �˜˜˜¿   rb   �˜˜˜¿ rc �˜˜˜¿ rd �˜˜˜¿
‡FE1ˆ˜˜˜˜·FE2ˆ˜˜˜˜˜˜˜˜˜˜˜˜·FE3ˆ˜˜˜˜˜˜·FE4ˆ˜˜˜˜·FE5‡
ˆ˜˜˜·  ˆ˜˜˜·  �˜˜˜¿  �´´˜`˜¿  ˆ˜˜˜·  ˆ˜˜˜·
‡CCAˆ˜˜˜˜·CC ˆ˜˜˜˜·CC ˆ˜˜˜˜¯·CC ˆ˜˜˜˜·CC ˆ˜˜˜˜·CCA‡
�˜˜˜� r1 �˜˜˜� r2 �˜˜˜� r2 ‡�˜´˜� r2 �˜˜˜� r3 �˜˜˜�
              ‡ ‡
              ‡ ‡ r2
              ‡�˜`˜¿
            re ‡‡CC ‡
              ‡�˜´˜�
              ‡ ‡ r2
              ‡ ‡
              ‡ ‡�˜˜˜¿ rf �˜˜˜¿ rg �˜˜˜¿
              �˜˜¯·FE6ˆ˜˜˜˜·FE7ˆ˜˜˜˜·FE8‡
              �˜``´˜˜� �˜˜`´˜˜�  ˆ˜˜˜·
              ‡CC ˆ˜˜˜˜·CC ˆ˜˜˜˜˜˜˜·CCA‡
              �˜˜˜� r2 �˜˜˜� r3  �˜˜˜�
Figure 2: Relationship with a basic service
7 Information flow
7.1 Information flow diagram
Figures 3 to 8 contain the information flows for the CD supplementary service.
The following notes are related to figures 3 to 8.
NOTE 1: The INFORM5 req.ind is not later presented to FE8 than the associated SETUP
req.ind.
NOTE 2: In case of:
- temporary mode of the COLR supplementary service activated at user C; or
- immediately responding terminal at user C,
the value of PI is determined on receipt of SETUP resp.conf from FE8.

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 rb  �˜˜˜˜˜¿    re     �˜˜˜˜˜¿    rf     �˜˜˜˜˜¿    rg    �˜˜˜˜˜¿
- - - -‡ FE3 ‡- - - - - - - - - -‡ FE6 ‡- - - - - - - - - -‡ FE7 ‡- - - - - - - - -‡ FE8 ‡
    �´˜˜˜´�          �´˜˜˜´�          �´˜˜˜´�         �´˜˜˜´�
    ‡  ‡           ‡  ‡           ‡  ‡          ‡  ‡
    ‡  ‡           ‡  ‡           ‡  ‡          ‡  ‡
    ‡936‡    INFORM4    ‡  ‡           ‡  ‡          ‡  ‡
    ˆ˜˜˜¯˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜>¯˜˜˜·           ‡  ‡          ‡  ‡
    ‡  ‡    req.ind    ‡963‡           ‡  ‡          ‡  ‡
    ‡  ‡           ‡  ‡           ‡  ‡          ‡  ‡
    ‡  ‡           ‡  ‡           ‡  ‡          ‡  ‡
    ‡  ‡    SETUP    ‡967‡           ‡  ‡          ‡  ‡
    ‡934‡>>>>| - - - - ->|>>>>‡  ‡           ‡  ‡          ‡  ‡
    ‡  ‡    req.ind    ‡964‡    INFORM4    ‡  ‡          ‡  ‡
    ‡  ‡           ˆ˜˜˜¯˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜>¯˜˜˜·          ‡  ‡
    ‡  ‡           ‡  ‡    req.ind    ‡973‡          ‡  ‡
    ‡  ‡           ‡  ‡           ‡972‡          ‡  ‡
    ‡  ‡           ‡  ‡           ‡  ‡          ‡  ‡
    ‡  ‡           ‡  ‡           ‡  ‡   (note 1)   ‡  ‡
    ‡  ‡           ‡  ‡    SETUP    ‡  ‡          ‡  ‡
    ‡  ‡           ‡  ‡>>>>| - - - - ->|>>>>‡  ‡          ‡  ‡
    ‡  ‡           ‡  ‡    req.ind    ‡974‡   INFORM5   ‡  ‡
    ‡  ‡           ‡  ‡           ˆ˜˜˜¯˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜>¯˜˜˜·
    ‡  ‡           ‡  ‡           ‡  ‡   req.ind   ‡981‡ INFORM5
    ‡  ‡           ‡  ‡           ‡  ‡          ˆ˜˜˜¯˜˜˜˜˜˜˜˜>
    ‡  ‡           ‡  ‡           ‡  ‡          ‡  ‡  ind.
    ‡  ‡           ‡  ‡           ‡  ‡    SETUP    ‡  ‡
    ‡  ‡           ‡  ‡           ‡  ‡>>>>| - - - ->|>>>>‡  ‡
    ‡  ‡           ‡  ‡           ‡  ‡   req.ind   ‡  ‡
    ‡  ‡           ‡  ‡           ‡  ‡          ‡  ‡
    ‡  ‡           ‡  ‡           ‡  ‡          ‡  ‡
    ‡  ‡           ‡  ‡           ‡  ‡          ‡  ‡
    ‡  ‡           ‡  ‡           ‡  ‡ REPORT (alerting) ‡  ‡
    ‡  ‡           ‡  ‡           ‡975‡<<<<|<- - - - |<<<<‡  ‡
    ‡  ‡           ‡  ‡           ‡  ‡   req.ind   ‡  ‡
    ‡  ‡           ‡  ‡           ‡  ‡          ‡  ‡
    ‡  ‡           ‡  ‡    INFORM6    ‡971‡          ‡  ‡
    ‡  ‡           ˆ˜˜˜·<˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜¯˜˜˜·   (note 2)   ‡  ‡
    ‡  ‡           ‡965‡    req.ind    ‡  ‡          ‡  ‡
    ‡  ‡           ‡966‡           ‡  ‡          ‡  ‡
    ‡  ‡    INFORM6    ‡961‡           ‡  ‡          ‡  ‡
    ˆ˜˜˜¯<˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜˜¯˜˜˜·           ‡  ‡          ‡  ‡
    ‡930‡    req.ind    ‡  ‡           ‡  ‡          ‡  ‡
    ‡  ‡           ‡  ‡           ‡  ‡          ‡  ‡
Figure 8: Flows across the public/private network interface at user C

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7.2 Definition of individual information flows
7.2.1 Relationship ra
7.2.1.1 Contents of INFORM2
The content of INFORM2 is shown in table 1.
Table 1
Parameter Allowed value req.ind
forwarding indicator M
7.2.1.2 Contents of INFORM7
The content of INFORM7 is shown in table 2.
Table 2
Parameter Allowed value req.ind
DTN ISDN number M (note)
DTN PI - number restricted M
- number not available
- number allowed
NOTE: Only present if PI = number allowed.
7.2.2 Relationship rb
7.2.2.1 Contents of INFORM1
The content of INFORM1 is shown in table 3.
Table 3
Parameter Allowed value req.ind
forwarding indicator including M
Notification Subscription Option (NSO) - No
- Yes, without DTN
- Yes, with DTN
forwarding cause CD M
DTN (note) O
NOTE: This option refers to the situation in which the DTN is withheld on the basis of a
network-provider decision.

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7.2.2.2 Contents of INFORM6
The content of INFORM6 is shown in table 4.
Table 4
Parameter Allowed value req.ind
PI - presentation allowed M
- presentation not allowed
7.2.3 Relationship rc
7.2.3.1 Contents of INFORM10 (rerouteing request)
NOTE: All the information necessary to FE3 to launch the forwarded call is included in the
INFORM10.
The content of INFORM10 is shown in table 5.
Table 5
Parameter Allowed value req.ind resp.conf
cause for forwarding CD M
forwarded-to address M
forwarding indicator M
forwarding number O
restriction indicator for forwarding number M
telecommunications service information M
user-to-user information O
forwarding counter M
calling party subaddress O
forwarding invocation result positive/negative M
acknowledgement
reason for rejection (note) O
NOTE: Possible reasons are: "service not subscribed", "service not available", "service not
implemented", "resource unavailable", "invalid DTN", "DTN is operator access", "DTN is special
service ISDN number", "number of diversions exceeded".

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7.2.4 Relationship rd
7.2.4.1 Contents of INFORM9 (CD request)
The content of INFORM9 is shown in table 6.
Table 6
Parameter Allowed value req.ind resp.conf
DTN ISDN numbe M
deflected-to subaddress O
forwarding number PI - presentation allowed O
- presentation restricted
deflecting invocation result positive/negative M
acknowledgement
reason for rejection (note) O
NOTE: Possible reasons are: "service not subscribed", "service not available", "service not
implemented", "resource unavailable", "invalid DTN", "DTN is operator access", "DTN is special
service ISDN number", "number of diversions exceeded", "another terminal has responded".
7.2.5 Relationship re
7.2.5.1 Contents of INFORM4
The content of INFORM4 is shown in table 7.
Table 7
Parameter Allowed value req.ind
forwarding cause CD M
forwarding number (note) M
forwarding counter M
originally called number (note) M
NOTE: This ISDN number shall always be transferred in the network together with a
"restriction indicator" whose value is set according to the subscription options of
the user. On boundaries between different networks or to private networks the
ISDN number need not be passed depending on a network-provider decision.

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7.2.5.2 Contents of INFORM6
The content of INFORM6 is shown in table 8.
Table 8
Parameter Allowed value req.ind
PI for DTN - presentation allowed M
- presentation not allowed
7.2.6 Relationship rf
7.2.6.1 Contents of INFORM4
The content of INFORM4 is shown in table 9.
Table 9
Parameter Allowed value req.ind
forwarding cause CD M
forwarding number (note) M
forwarding counter M
originally called number (note) M
NOTE: This ISDN number shall always be transferred in the network together with a
"restriction indicator" whose value is set according to the subscription options of
the user. On boundaries between different networks or to private networks the
ISDN number need not be passed depending on a network-provider decision.
7.2.6.2 Contents of INFORM6
The content of INFORM6 is shown in table 10.
Table 10
Parameter Allowed value req.ind
PI for DTN - presentation allowed M
- presentation not allowed

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7.2.7 Relationship rg
7.2.7.1 Contents of INFORM5
The content of INFORM5 is shown in table 11.
Table 11
Parameter Allowed value req.ind
last forwarding cause M
last forwarding number (note 1) - ISDN number O
- number restricted
- number not available
originally called number (note 1) - ISDN number O
- number restricted
- number not available
calling party address (note 2) - address O
- number r
...