ETSI ETS 300 361 ed.1 (1994-11)

Private Telecommunication Network (PTN); Specification, functional models and information flows; Call offer supplementary service

DE/ECMA-00008

Zasebno telekomunikacijsko omrežje (PTN) – Specifikacija, funkcijski model in informacijski pretoki - Dopolnilna storitev: ponudba klica

General Information

• Status: Published
• Publication Date: 03-Nov-1994
• Technical Committee: Ecma - Standardizing information and communications systems
• Current Stage: 12 - Completion
• Due Date: 12-Oct-1994
• Completion Date: 04-Nov-1994
• Ref Project: SIST ETS 300 361 E1:2005 - Private Telecommunication Network (PTN); Specification, functional models and information flows; Call offer supplementary service

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 361 E1:2005
01-maj-2005
Zasebno telekomunikacijsko omrežje (PTN) – Specifikacija, funkcijski model in
informacijski pretoki - Dopolnilna storitev: ponudba klica
Private Telecommunication Network (PTN); Specification, functional models and
information flows; Call offer supplementary service
Ta slovenski standard je istoveten z: ETS 300 361 Edition 1
ICS:
33.040.35 Telefonska omrežja Telephone networks
SIST ETS 300 361 E1:2005 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 361 E1:2005

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SIST ETS 300 361 E1:2005
EUROPEAN ETS 300 361
TELECOMMUNICATION November 1994
STANDARD
Source: ETSI TC-ECMA Reference: DE/ECMA-00008
ICS: 33.080
Key words: CO, PTN, stage 1, stage 2, supplementary service, ECMA-191
Private Telecommunication Network (PTN);
Specification, functional model and information flows
Call offer supplementary service
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE
Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
X.400: c=fr, a=atlas, p=etsi, s=secretariat - Internet: [e-mail]
Tel.: [phone] - Fax: [phone]
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 Standards Approval Dept." at the address shown on the title page.

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Contents
Foreword.5
1 Scope .7
2 Conformance .7
3 References .7
4 Definitions .8
4.1 External definitions.8
4.2 Additional network feature .9
4.3 Automatic Call Offer invocation timer .9
4.4 Busy.9
4.5 Call, Basic call.9
4.6 Consultation timer .9
4.7 Offered call.9
4.8 Path retention.9
5 List of acronyms .9
6 SS-CO stage 1 specification .10
6.1 Description .10
6.1.1 General description .10
6.1.2 Qualifications on applicability to telecommunication services .10
6.2 Procedures .10
6.2.1 Provision/withdrawal .10
6.2.2 Normal procedures.10
6.2.2.1 Activation/deactivation/registration/interrogation.10
6.2.2.2 Invocation and operation.10
6.2.3 Exceptional procedures .11
6.2.3.1 Activation/deactivation/registration/interrogation.11
6.2.3.2 Invocation and operation.12
6.3 Interactions with other supplementary services and ANFs .12
6.3.1 Calling Line Identification Presentation (SS-CLIP).12
6.3.2 Connected Line Identification Presentation (SS-COLP).12
6.3.3 Calling/Connected Line Identification Restriction (SS-CLIR).12
6.3.4 Calling Name Identification Presentation (SS-CNIP) .12
6.3.5 Connected Name Identification Presentation (SS-CONP) .12
6.3.6 Calling/Connected Name Identification Restriction (SS-CNIR) .12
6.3.7 Call Forwarding (SS-CFU/SS-CFB/SS-CFNR) .12
6.3.7.1 Call Forwarding Unconditional (SS-CFU).12
6.3.7.2 Call Forwarding Busy (SS-CFB) .13
6.3.7.3 Call Forwarding No Reply (SS-CFNR) .13
6.3.8 Call Transfer (SS-CT).13
6.3.9 Call Completion to Busy Subscriber (SS-CCBS).13
6.3.10 Call Completion on No Reply (SS-CCNR).13
6.3.11 Do Not Disturb (SS-DND).13
6.3.12 Do Not Disturb Override (SS-DNDO).14
6.3.13 Path Replacement (ANF-PR) .14
6.4 Interworking considerations .14

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6.5 Overall SDL. 14
7 SS-CO stage 2 specification. 19
7.1 Functional model . 19
7.1.1 Functional model description . 19
7.1.2 Description of Functional Entities. 20
7.1.2.1 Calling user's control entity, FE1 . 20
7.1.2.2 Called user's control entity, FE2. 21
7.1.3 Relationship of functional model to Basic Call functional model . 21
7.2 Information flows. 21
7.2.1 Definition of information flows. 21
7.2.1.1 ra-CO-ACTIVATE. 21
7.2.1.2 ra-CO-AVAILABLE. 22
7.2.1.3 ra-CO-INVOKE-IMMEDIATE . 22
7.2.1.4 ra-CO-INVOKE . 22
7.2.1.5 ra-CO-TERMINATED. 23
7.2.2 Relationship of information flows to Basic Call information flows . 23
7.2.3 Information flow sequences. 25
7.2.3.1 Normal operation of SS-CO . 25
7.2.3.2 Failure operation of SS-CO. 28
7.3 Functional Entity actions. 33
7.3.1 Functional Entity actions of FE1 . 33
7.3.2 Functional Entity actions of FE2 . 33
7.4 Functional Entity behaviour. 34
7.4.1 Behaviour of FE1 . 34
7.4.2 Behaviour of FE2 . 41
7.5 Allocation of Functional Entities to physical equipment . 44
7.6 Interworking considerations. 44
History . 45

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Foreword
This European Telecommunication Standard (ETS) has been produced by the European Computer Manufacturers
Association (ECMA) on behalf of its members and those of the European Telecommunications Standards Institute
(ETSI).
This ETS is one of a series of standards defining services and signalling protocols applicable to Private
Telecommunication Networks (PTNs). The series uses the ISDN concepts as developed by the ITU-TS and is also
within the framework of standards for open systems interconnection as defined by ISO.
This ETS specifies the Call Offer supplementary service, which is applicable to various basic services supported by
Private Telecommunication Networks (PTNs).
The ETS is based upon the practical experience of ECMA member companies and the results of their active and
continuous participation in the work of ISO, ITU-TS, ETSI and other international and national standardisation bodies.
It represents a pragmatic and widely based consensus.
This ETS was produced by ECMA using the ECMA guidelines for the production of standards and using the ECMA
stylesheet. In order to avoid undue delays in the approval process for this ETS it has been agreed that this ETS will not
be converted to the ETSI stylesheet.
Transposition dates
Date of latest announcement of this ETS (doa): 28 February 1995
Date of latest publication of new National Standard 31 August 1995
or endorsement of this ETS (dop/e):
Date of withdrawal of any conflicting National Standard (dow): 31 August 1995

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1 Scope
This European Telecommunication Standard (ETS) specifies the Supplementary Service Call Offer (SS-CO),
which is applicable to various basic services supported by Private Telecommunication Networks (PTNs). Basic
services are specified in ETS 300 171.
SS-CO is a supplementary service which , on request from the calling user (or on that user's behalf), enables a
call to be offered to a busy called user and to wait for that called user to accept this call.
Services specifications are produced in three stages, according to the method described in ETS 300 387. This
ETS contains the stage 1 and stage 2 specifications of SS-CO. The stage 1 specification (clause 6) specifies the
supplementary service as seen by users of PTNs. The stage 2 specification (clause 7) identifies the functional
entities involved in the supplementary service and the information flows between them.
NOTE 1
For this ETS, stage 2 does not consider the split of functionality between a functional terminal and the local PTNX.
Terminal functions and local PTNX functions are included in the same Functional Entity.
2 Conformance
In order to conform to this ETS, a stage 3 standard shall specify signalling protocols and equipment behaviour
that are capable of being used in a PTN which supports the supplementary service specified in this ETS. This
means that to claim conformance, a stage 3 standard is required to be adequate for the support of these 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 References
ETS 300 171 Private Telecommunications Network (PTN); Specification, functional models and
information flows Control aspects of circuit mode basic services (ECMA-BCSD)
ETS 300 173 Private Telecommunications Network (PTN); Specification, functional models and
information flows Identification supplementary services (ECMA-ISSD)
ETS 300 237 Private Telecommunication Network (PTN); Specification, functional models and
information flows Name identification supplementary service; ECMA-NISD
ETS 300 256 Private Telecommunication Network (PTN); Specification, functional models and
information flows Diversion supplementary services
ETS 300 260 Private Telecommunication Network (PTN); Specification, functional models and
information flows Call transfer supplementary service
ETS 300 363 Private Telecommunication Network (PTN); Specification, functional model and
information flows Do not disturb and do not disturb override supplementary services
ETS 300 365 Private Telecommunication Network (PTN); Specification, functional models and
information flows Call completion supplementary services
ETS 300 387 Private Telecommunications Network (PTN); Method for the specification of basic and
supplementary services
ENV 41007-1 Definition of terms in private telecommunication networks (1989)
CCITT Rec. I.112 Vocabulary of terms for ISDNs (1988)
CCITT Rec. I.210 Principles of telecommunication services supported by an ISDN and the means to describe
them (1988)

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CCITT Rec. I.221 Common specific characteristics of services (1988)
CCITT Rec. Z.100 Specification and description language (1988)
4 Definitions
For the purpose of this ETS, the following definitions apply.
4.1 External definitions
This ETS uses the following terms defined in other documents:
− Basic Service (CCITT Rec. I.210)
− Connection (CCITT Rec. I.112)
− Network Determined User Busy (CCITT Rec. I.221)
− Private (ENV 41007-1)
− Private Telecommunication Network Exchange (PTNX) (ENV 41007-1)
− Public (ENV 41007-1)
− Public ISDN (ENV 41007-1)
− Service (CCITT Rec. I.112)
− Signalling (CCITT Rec. I.112)
− Supplementary Service (CCITT Rec. I.210)
− Telecommunication Network (ENV 41007-1)
− Terminal, Terminal equipment (ENV 41007-1)
− User (ETS 300 171)
− User Determined User Busy (CCITT Rec. I.221)
This ETS refers to the following basic call Functional Entities (FEs) defined in ETS 300 171:
− Call Control (CC)
− Call Control Agent (CCA)
This ETS refers to the following basic call inter-FE relationships defined in ETS 300 171:
− r1
− r2
-r3
This ETS refers to the following basic call information flows defined in ETS 300 171:
− SETUP request/indication
− SETUP response/confirmation
− REPORT request/indication
− RELEASE request/indication
− RELEASE response/confirmation

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4.2 Additional network feature
A capability, over and above that of a basic service, provided by a PTN, but not directly to a PTN user.
4.3 Automatic Call Offer invocation timer
A timer governing the time after which SS-CO is automatically invoked after the calling user has been
informed that a call has failed because of busy at the destination. The duration of the timer is an
implementation option.
4.4 Busy
A property of a user for whom either a Network Determined User Busy or User Determined User Busy
condition exists.
4.5 Call, Basic call
An instance of the use of a basic service.
4.6 Consultation timer
A timer governing the time in which the calling user is allowed to request invocation of SS-CO after being
informed that a call has failed because of busy at the destination. The duration of the timer is an
implementation option.
4.7 Offered call
A call that is in a waiting condition as a result of invocation of SS-CO, against a busy called user.
4.8 Path retention
The retaining of the network connection between the Originating CC and the Destination CC so that a
supplementary service (such as SS-CO) can be invoked without establishing a new connection.
5 List of acronyms
ANF Additional Network Feature
CC Call Control (functional entity)
CCA Call Control Agent (functional entity)
FE Functional Entity
PR Path Replacement
PTN Private Telecommunication Network
PTNX Private Telecommunication Network Exchange
SDL Specification and Description Language
SS-CCBS Call Completion to Busy Subscriber Supplementary Service
SS-CCNR Call Completion on No Reply Supplementary Service
SS-CFB Call Forwarding Busy Supplementary Service
SS-CFNR Call Forwarding No Reply Supplementary Service
SS-CFU Call Forwarding Unconditional Supplementary Service
SS-CLIP Calling Line Identification Presentation Supplementary Service
SS-CLIR Calling/Connected Line Identification Restriction Supplementary Service
SS-CNIP Calling Name Identification Presentation Supplementary Service
SS-CNIR Calling/Connected Name Identification Restriction Supplementary Service
SS-CO Call Offer Supplementary Service
SS-COLP Connected Line Identification Presentation Supplementary Service
SS-CONP Connected Name Identification Presentation Supplementary Service

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SS-CT Call Transfer Supplementary Service
SS-DND Do Not Disturb Supplementary Service
SS-DNDO Do Not Disturb Override Supplementary Service
TE Terminal Equipment
6 SS-CO stage 1 specification
6.1 Description
6.1.1 General description
SS-CO is a supplementary service which, on request from the calling user (or on that user's behalf),
enables a call to be offered to a busy called user and to wait for that called user to accept the call, after the
necessary resources have become available.
The busy called user is given an indication of the offered call. During the time that the call is offered, the
called user may ignore the offered call or may attempt to make the necessary resources available (e.g. by
releasing or placing on hold another call). When and if the necessary resources become available, the call
shall be completed as a normal incoming call.
6.1.2 Qualifications on applicability to telecommunication services
SS-CO is applicable to all circuit mode basic services defined in ETS 300 171.
6.2 Procedures
6.2.1 Provision/withdrawal
SS-CO may be provided or withdrawn after pre-arrangement with the service provider (by means of service
profile control), or may be available generally to all users. In a PTN that offers more than one way of
invoking SS-CO (see 6.2.2.2), one or more of these ways shall be selected at provision time.
6.2.2 Normal procedures
6.2.2.1 Activation/deactivation/registration/interrogation
Not applicable.
6.2.2.2 Invocation and operation
There are four different ways of invoking SS-CO. A PTN shall offer one or more of these ways. These
ways are:
1 Network invocation (immediate): the PTN shall automatically invoke SS-CO whenever the calling
user makes a call to a user that is busy, if required by the service profile of the calling user.
2 Consultation: the calling user, on being informed that a call has failed because of busy at the
destination and that SS-CO may be possible, shall be able, within a defined time period
(consultation timer) to request invocation of SS-CO.
3 Immediate invocation: the calling user shall be able to request invocation of SS-CO as part of the
initial call set up.
4 Network invocation (delayed): the network, having informed the calling user that a call has failed
because of busy at the destination, shall automatically invoke SS-CO unless the calling user
initiates call clearing within a defined time period (automatic call offer invocation timer).

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NOTE 2
If method 1 is provided to a user, methods 2, 3 and 4 will not be available to that user.
For consultation and network invocation (delayed), for those basic services for which ETS 300 171
requires an in-band tone or announcement to indicate progress or otherwise of the call, the information
provided by the network that the call has failed because of busy at the destination shall include an in-
band tone or announcement.
If the calling user is provided with both consultation and network invocation (delayed), the calling user
shall be able to request SS-CO during the period of the automatic call offer invocation timer. If, at the
time of expiry of the automatic call offer timer, the calling user has not requested SS-CO and has not
initiated call clearing, the network shall automatically invoke SS-CO.
On successful invocation of SS-CO, the called user shall receive an indication of the offered call, and
the calling user shall be advised that SS-CO has been invoked. Additional information that would
normally accompany an incoming call indication (see ETS 300 171) may optionally be provided to the
called user. During the waiting period, for those basic services for which ETS 300 171 requires an in-
band tone or announcement to indicate progress or otherwise of the call, an in-band tone or
announcement shall be given to the calling user.
If the PTN detects that the necessary resources have become available, it shall transfer an incoming call
indication to the called user.
NOTE 3
The waiting period for the offered call can be subject to time-out. At time-out, the offered call can be
released. Any such procedure is outside the scope of this ETS.
SS-CO shall be considered completed when any one of the following occurs:
− the called user starts alerting;
− the called user accepts the call;
− the calling user releases the offered call;
− the called user rejects the offered call.
If the called user starts alerting, the calling user shall receive an appropriate indication.
If the called user rejects the offered call, the call shall be released with an appropriate indication to the
calling user.
6.2.3 Exceptional procedures
6.2.3.1 Activation/deactivation/registration/interrogation
Not applicable.

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6.2.3.2 Invocation and operation
If the calling user requests invocation of SS-CO as part of the initial call request, and immediate
invocation is not provided to the calling user, then the request shall be ignored and the call shall proceed
as if the request had not been made.
An SS-CO request may be rejected for other reasons, e.g. when the number of calls already offered to
the called user is equal to the maximum allowed for this user or when the call fails due to network
conditions (see clause 9.3.3 of ETS 300 171). If the request has been initiated by means of immediate
invocation, consultation or network invocation (delayed), the calling user shall be informed that the SS-
CO request is rejected.
If consultation applies to the call, the call shall be released either if the calling user does not request
invocation within the defined time period (consultation timer) or if the calling user requests invocation
within the defined time period (consultation timer) and this request is rejected.
If SS-CO is requested and the called user is found to be not busy, the call shall be treated as a normal
incoming call to the called user.
6.3 Interactions with other supplementary services and ANFs
Interactions with other supplementary services and ANFs for which PTN standards were available at the time
of publication of this ETS are specified below.
6.3.1 Calling Line Identification Presentation (SS-CLIP)
The called user shall receive, as part of the offered call, the Calling Line Identification of the calling user,
unless SS-CLIR applies and the called user has no override capability.
6.3.2 Connected Line Identification Presentation (SS-COLP)
No interaction.
6.3.3 Calling/Connected Line Identification Restriction (SS-CLIR)
When Calling Line Identification Restriction has been invoked, the Calling Line Identification shall not be
presented to the called user (as part of the offered call), unless the called user has an override category.
6.3.4 Calling Name Identification Presentation (SS-CNIP)
The called user shall receive, as part of the offered call, the Calling Name Identification of the calling user,
unless SS-CNIR applies and the called user has no override capability.
6.3.5 Connected Name Identification Presentation (SS-CONP)
No interaction.
6.3.6 Calling/Connected Name Identification Restriction (SS-CNIR)
When Calling Name Identification Restriction has been invoked, the Calling Name Identification shall not
be presented to the called user (as part of the offered call), unless the called user has an override category.
6.3.7 Call Forwarding (SS-CFU/SS-CFB/SS-CFNR)
6.3.7.1 Call Forwarding Unconditional (SS-CFU)
SS-CO, if invoked, shall operate on a busy user that has been forwarded to as a result of one or more
invocations of SS-CFU.

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6.3.7.2 Call Forwarding Busy (SS-CFB)
If SS-CO invocation is requested by the calling user as part of the initial call set up or automatically by
the network when a call is made to a user that is busy, and if the called user is busy and has SS-CFB
active, SS-CFB shall be invoked. If the SS-CFB forwarded-to user is also busy, SS-CO shall operate on
the forwarded-to user. If the call undergoes more than one forwarding, at least one of which is SS-CFB,
but excluding SS-CFNR, SS-CO shall operate on the final forwarded-to user if that user is busy.
If the calling user is informed that a call has failed because of busy at the destination, and if SS-CO is
subsequently invoked, SS-CO shall operate on the SS-CFB forwarding user or on the SS-CFB
forwarded-to user. If the call has undergone more than one forwarding, at least one of which is SS-CFB,
but excluding SS-CFNR, then SS-CO shall operate either on the first SS-CFB forwarding user or on the
final forwarded-to user. Choice between the two is an implementation option. An implementation may
permit the calling user to make the choice.
6.3.7.3 Call Forwarding No Reply (SS-CFNR)
SS-CO if invoked, shall not operate on a busy user arrived at as a result of one or more forwardings, at
least one of which is SS-CFNR. The procedures of SS-CFNR shall apply.
SS-CFNR can apply when alerting a user after completion of SS-CO on that user.
6.3.8 Call Transfer (SS-CT)
It shall be possible for a user, after having successfully invoked SS-CO against a busy called user, to
invoke call transfer for transferring a third user to that called user. This shall operate in a similar manner to
Call Transfer during the alerting state, except that the call shall continue as an offered call to the called
user. The third user may be notified that the call is in a waiting condition against a busy called user. If the
called user subsequently enters an alerting phase and a notification that the call is in a waiting condition
against a busy called user has been given to the third user, the third user
...