ETSI ETS 300 362 ed.1 (1994-11)

Private Telecommunication Network (PTN); Inter-exchange signalling protocol; Call offer supplementary service

DE/ECMA-00052

Zasebno telekomunikacijsko omrežje (PTN) – Medcentralni signalizacijski protokol - 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
• Mandate: T-75C.3
• Ref Project: SIST ETS 300 362 E1:2005 - Private Telecommunication Network (PTN); Inter-exchange signalling protocol; Call offer supplementary service

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 362 E1:2005
01-maj-2005
Zasebno telekomunikacijsko omrežje (PTN) – Medcentralni signalizacijski protokol
- Dopolnilna storitev: ponudba klica
Private Telecommunication Network (PTN); Inter-exchange signalling protocol; Call offer
supplementary service
Ta slovenski standard je istoveten z: ETS 300 362 Edition 1
ICS:
33.040.35 Telefonska omrežja Telephone networks
SIST ETS 300 362 E1:2005 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 362 E1:2005

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SIST ETS 300 362 E1:2005
EUROPEAN ETS 300 362
TELECOMMUNICATION November 1994
STANDARD
Source:ETSI TC-ECMA Reference:DE/ECMA-00052
ICS: 33.080
CCS, CO, PTN, QSIG, stage 3, supplementary service, ECMA-192
Key words:
Private Telecommunication Network (PTN);
Inter-exchange signalling protocol
Call offer supplementary service
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 - [e-mail]
X.400: Internet:
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 Committee Support 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 Inter-PTNX link.8
4.3 Path retention.8
5 List of acronyms .9
6 Signalling protocol for the support of SS-CO.9
6.1 SS-CO description .9
6.2 SS-CO operational requirements .9
6.2.1 Requirements on the Originating PTNX .9
6.2.2 Requirements on the Terminating PTNX.9
6.2.3 Requirements on a Transit PTNX .9
6.3 SS-CO coding requirements .9
6.3.1 Operations.9
6.3.2 Notifications.12
6.3.3 Information elements.12
6.3.3.1 Facility information element .12
6.3.3.2 Notification indicator information element .12
6.3.3.3 Other information elements.13
6.3.4 Messages .13
6.4 SS-CO state definitions.13
6.4.1 States at the Originating PTNX.13
6.4.1.1 State CO-Idle .13
6.4.1.2 State CO-Wait-Ack .13
6.4.2 States at the Terminating PTNX .13
6.4.2.1 State CO-Idle .13
6.4.2.2 State CO-Dest-Invoked .13
6.5 SS-CO signalling procedures for activation, deactivation and registration.13
6.6 SS-CO signalling procedures for invocation and operation.13
6.6.1 Actions at the Originating PTNX.13
6.6.1.1 Normal procedures.14
6.6.1.2 Exceptional procedures.14
6.6.2 Actions at the Terminating PTNX.14
6.6.2.1 Normal procedures.15
6.6.2.2 Exceptional procedures.15
6.6.3 Actions at a Transit PTNX.16
6.7 SS-CO impact of interworking with public ISDNs.16
6.8 SS-CO impact of interworking with non-ISDNs.16
6.9 SS-CO parameter values (timers) .16
Annex A (normative): Signalling protocol for the support of Path Retention.17
A.1 Path Retention description.17

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A.2 Path Retention operational requirements . 17
A.2.1 Requirements on the Originating PTNX . 17
A.2.2 Requirements on the Terminating PTNX . 17
A.2.3 Requirements on a Transit PTNX . 17
A.3 Path Retention coding requirements . 18
A.3.1 Operations . 18
A.3.2 Information elements. 18
A.3.3 Messages . 18
A.4 Path Retention state definitions. 18
A.4.1 States at the Originating PTNX. 18
A.4.1.1 PRTO-Idle. 18
A.4.1.2 PRTO-Requested. 18
A.4.1.3 PRTO-Retained. 18
A.4.1.4 PRTO-Invoking. 18
A.4.2 States at the Terminating PTNX. 18
A.4.2.1 PRTT-Idle . 18
A.4.2.2 PRTT-Requested. 19
A.4.2.3 PRTT-Retained . 19
A.4.2.4 PRTT-Invoking . 19
A.5 Path Retention signalling procedures for invocation and operation. 19
A.5.1 Actions at the Originating PTNX . 19
A.5.2 Actions at the Terminating PTNX. 20
A.5.3 Actions at a Transit PTNX . 21
A.6 Path Retention impact of interworking with public ISDNs. 21
A.7 Path Retention impact of interworking with non-ISDNs. 21
A.8 Path Retention parameter values (timers) . 21
A.9 Specification and Description Language (SDL) - Representation of procedures
(informative) . 22
A.9.1 SDL representation of Path Retention at the Originating PTNX. 22
A.9.2 SDL representation of Path Retention at the Terminating PTNX. 24
Annex B (normative): Protocol Implementation Conformance Statement (PICS) Proforma. 27
B.1 Introduction. 27
B.2 Instructions for completing the PICS proforma . 27
B.2.1 General structure of the PICS proforma . 27
B.2.2 Additional information . 28
B.2.3 Exception information . 28
B.3 PICS proforma for ETS 300 362 . 28
B.3.1 Implementation identification. 28
B.3.2 Protocol summary. 29
B.3.3 General . 29
B.3.4 Procedures. 30
B.3.5 Coding . 30
B.3.6 Timers . 30
Annex C (informative): Examples of Message Sequences. 31
C.1 Example message sequence for normal operation of SS-CO without Path Retention. 32
C.2 Example message sequence for normal operation of SS-CO with Path Retention. 33
C.3 Example of unsuccessful invocation of SS-CO without Path Retention . 34
C.4 Example of unsuccessful invocation of Path Retention for SS-CO. 34
Annex D (informative): Specification and Description Language (SDL) representation of procedures. 35
D.1 SDL representation of SS-CO at the Originating PTNX. 36
D.2 SDL representation of SS-CO at the Terminating PTNX . 37
History . 38

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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-T(formerly CCITT)
and is also within the framework of standards for open systems interconnection as defined by ISO.
This ETS specifies the signalling protocol for use at the Q reference point in support of the Call Offer supplementary
service.
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-T(formerly CCITT), 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 signalling protocol for the support of the Call
Offer supplementary service (SS-CO) at the Q reference point between Private Telecommunication Network
Exchanges (PTNXs) connected together within a Private Telecommunication Network (PTN).
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.
The Q reference point is defined in IS 11579.
Service specifications are produced in three stages and according to the method specified in ETS 300 387. This
ETS contains the stage 3 specification for the Q reference point and satisfies the requirements identified by the
stage 1 and stage 2 specifications in ETS 300 361.
The signalling protocol for SS-CO operates on top of the signalling protocol for basic circuit switched call
control, as specified in ETS 300 172, and uses certain aspects of the generic procedures for the control of
supplementary services specified in ETS 300 239.
The impact on the protocol of interactions between the Call Offer supplementary service and other
supplementary services is outside the scope of this ETS.
This ETS is applicable to PTNXs which can interconnect to form a PTN.
2 Conformance
In order to conform to this ETS, a PTNX shall satisfy the requirements identified in the Protocol
Implementation Conformance Statement (PICS) proforma in annex B.
3 References
IS 11579 Information Technology - Telecommunications and Information Exchange Between Systems
- Private Integrated Services Network - Reference Configurations for PISN Exchanges
(1993).
ETS 300 171 Private Telecommunication Network (PTN); Specification, functional model and
information flows, control aspects of circuit mode basic services (1993).
ETS 300 172 Private Telecommunication Network (PTN); Inter-exchange signalling protocol, circuit
mode basic services (1993).
ETS 300 196 Integrated Services Digital Network (ISDN); Generic functional protocol for the support of
supplementary services Digital Subscriber Signalling System No. one (DSS1) protocol.
ETS 300 239 Private Telecommunication Network (PTN); Inter-exchange signalling protocol, generic
functional protocol for the support of supplementary services (1993).
ETS 300 361 Private Telecommunication Network (PTN); Specification, functional model and
information flows Call offer supplementary service (1994).
ETS 300 387 Private Telecommunications Network (PTN); Method for the specification of basic and
supplementary services (1994).
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).
CCITT Rec. Z.100 Specification and description language (1988).

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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:
− Application Protocol Data Unit (APDU) (ETS 300 239);
− Basic Service (CCITT Recommendation I.210);
− Call, Basic Call (ETS 300 239);
− Coordination Function (ETS 300 239);
− Notification (ETS 300 239);
− Originating PTNX (ETS 300 172);
− Private (ENV 41007-1);
− Private Telecommunication Network Exchange (ENV 41007-1);
− Public ISDN (ENV 41007-1);
− Signalling (CCITT Recommendation I.112);
− Supplementary Service (CCITT Recommendation I.210);
− Supplementary Service Control Entity (ETS 300 239);
− Telecommunication Network (ENV 41007-1);
− Terminal (ENV 41007-1);
− Terminating PTNX. (ETS 300 172);
− Transit PTNX (ETS 300 172);
− User (ETS 300 171).
4.2 Inter-PTNX link
The totality of a signalling channel and a number of user information channels at the Q reference point.
4.3 Path retention
The retaining of the network connection between the Originating PTNX and the Terminating PTNX so that a
supplementary service (such as SS-CO) can be invoked without establishing a new connection.

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5 List of acronyms
APDU Application Protocol Data Unit
ASN.1 Abstract Syntax Notation no. 1
ISDN Integrated Services Digital Network
NFE Network Facility Extension
PICS Protocol Implementation Conformance Statement
PTN Private Telecommunication Network
PTNX Private Telecommunication Network Exchange
SDL Specification and Description Language
SS-CO Call Offer supplementary service
6 Signalling protocol for the support of SS-CO
6.1 SS-CO description
Call Offer (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.
SS-CO is applicable to all circuit mode basic services defined in ETS 300 171.
6.2 SS-CO operational requirements
6.2.1 Requirements on the Originating PTNX
Call establishment procedures for the outgoing side of an inter-PTNX link and call release procedures, as
specified in ETS 300 172, shall apply.
Generic procedures for the call-related control of supplementary services, as specified in ETS 300 239 for
an End PTNX, shall apply.
6.2.2 Requirements on the Terminating PTNX
Call establishment procedures for the incoming side of an inter-PTNX link and call release procedures, as
specified in ETS 300 172, shall apply.
Generic procedures for the call-related control of supplementary services, as specified in ETS 300 239 for
an End PTNX, shall apply.
6.2.3 Requirements on a Transit PTNX
Basic call procedures specified in ETS 300 172 for a Transit PTNX shall apply.
Generic procedures for the call-related control of supplementary services, as specified in ETS 300 239 for
a Transit PTNX, shall apply.
For SS-CO the requirements are limited to the passing on of Facility information elements for which the
destination, as indicated in the NFE, is not the Transit PTNX.
6.3 SS-CO coding requirements
6.3.1 Operations
The operations defined in Abstract Syntax Notation number 1 (ASN.1) in table 1 shall apply.

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Table 1 - Operations in support of SS-CO
Call-Offer-Operations
{iso(1) identified-organization(3) icd-ecma(0012) standard(0)
qsig-call-offer(192) call-offer-operations (0) }
DEFINITIONS EXPLICIT TAGS::=
BEGIN
IMPORTS OPERATION, ERROR FROM Remote-Operation-Notation
{joint-iso-ccitt(2) remote-operations(4) notation(0)}
Extension FROM ECMA-manufacturer-specific-service-extension-definition
{iso(1) identified-organization(3) icd-ecma(0012) standard(0)
qsig-generic-procedures(165) msi-definition(0)}
notAvailable, supplementaryServiceInteractionNotAllowed FROM General-Errors
{ccitt(0) identified-organization(3) etsi (0) 196 general-errors (2)};
ptn OBJECT IDENTIFIER
::= { iso(1) identified-organization(3) icd-ecma(0012)
private-isdn-signalling-domain (9)}
PathRetain ::= OPERATION
ARGUMENT PathRetainArg
-- this operation may be used by other supplementary services
-- using other values of argument
ServiceAvailable ::= OPERATION
ARGUMENT ServiceAvailableArg
-- this operation may be used by other supplementary services
-- using other values of argument
CallOfferRequest ::= OPERATION
ARGUMENT DummyArg
RESULT DummyRes
ERRORS { notAvailable, notBusy, temporarilyUnavailable,
supplementaryServiceInteractionNotAllowed, unspecified}
PathRetainArg ::= CHOICE {serviceList ServiceList,
extendedServiceList SEQUENCE{
serviceList ServiceList,
extension Extension
}
}

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ServiceAvailableArg ::= CHOICE {serviceList ServiceList,
extendedServiceList SEQUENCE{
serviceList ServiceList,
extension Extension
}
}
ServiceList ::= BIT STRING (SIZE(1.32)) {callOffer(0)}
-- bits other than callOffer(0) are reserved for
-- other supplementary services
DummyArg ::= CHOICE{
null NULL,
extension [1] IMPLICIT Extension,
sequenceOfExtn [2] IMPLICIT SEQUENCE OF Extension}
DummyRes ::= CHOICE{
null NULL,
extension [1] IMPLICIT Extension,
sequenceOfExtn [2] IMPLICIT SEQUENCE OF Extension}
callOfferRequest CallOfferRequest ::= {ptn co-request(34)}
pathRetain   PathRetain   ::= {ptn path-retain(41)}
serviceAvailable ServiceAvailable ::={ptn service-available(42)}
notBusy ERROR ::= {ptn 1009}
-- used when an SS-CO request is received in
-- a Terminating PTNX and the called user is not busy
temporarilyUnavailable ERROR ::={ptn 1000}
-- used when conditions for invocation of SS-CO
-- are momentarily not met
Unspecified ::= ERROR PARAMETER Extension
unspecified Unspecified ::= {ptn 1008}
END -- of Call-Offer-Operations

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6.3.2 Notifications
The notification defined in Abstract Syntax Notation number 1(ASN.1) in table 2 shall apply.
Table 2 - Notification in support of SS-CO
Call-Offer-Notifications
{iso(1) identified-organization(3) icd-ecma(0012) standard(0)
qsig-call-offer(192) call-offer-notifications(1)}
DEFINITIONS ::=
BEGIN
IMPORTS NOTIFICATION FROM Notification-Data-Structure
{iso(1) identified-organization(3) icd-ecma(0012) standard(0)
qsig-generic-procedures(165) notification-data-structure(7)};
RemoteUserAlerting ::= NOTIFICATION
ARGUMENT NULL
remoteUserAlerting RemoteUserAlerting ::=
{iso(1) identified-organization(3) icd-ecma(0012)
private-isdn-signalling-domain(9) 2000}
END --of Call-Offer-Notifications
6.3.3 Information elements
6.3.3.1 Facility information element
The operations defined above shall be coded in the Facility information element in accordance with
ETS 300 239.
When conveying an APDU of operation callOfferRequest, the NFE shall be included.
When conveying the invoke APDU of operation callOfferRequest, the destinationEntity data element of
the NFE shall contain value endPTNX.
When conveying the invoke APDU of operation callOfferRequest, the Interpretation APDU shall be
omitted.
NOTE 1
Additional requirements for the conveyance of APDUs of operations pathRetain and serviceAvailable are
given in A.3.2 of annex A.
6.3.3.2 Notification indicator information element
The notification defined above shall be coded in the Notification indicator information element in
accordance with ETS 300 239.

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6.3.3.3 Other information elements
Any other information elements (e.g. Cause, Progress indicator) shall be coded in accordance with the
rules of ETS 300 172.
6.3.4 Messages
The Facility information element and the Notification indicator information element shall be conveyed in
the messages as specified in clause 10 of ETS 300 239.
Messages used for call establishment and release shall be as specified in ETS 300 172.
6.4 SS-CO state definitions
6.4.1 States at the Originating PTNX
The procedures for the Originating PTNX are written in terms of the following conceptual states existing
within the SS-CO Supplementary Service Control entity in that PTNX in association with a particular call.
6.4.1.1 State CO-Idle
SS-CO is not operating.
6.4.1.2 State CO-Wait-Ack
The Originating PTNX has requested SS-CO and is waiting for an acknowledgement from the
Terminating PTNX.
6.4.2 States at the Terminating PTNX
The procedures for the Terminating PTNX are written in terms of the following conceptual states existing
within the SS-CO Supplementary Service Control entity in that PTNX in association with a particular call.
6.4.2.1 State CO-Idle
SS-CO is not operating.
6.4.2.2 State CO-Dest-Invoked
SS-CO has been invoked successfully.
6.5 SS-CO signalling procedures for activation, deactivation and registration
Not applicable.
6.6 SS-CO signalling procedures for invocation and operation
The following procedures are call associated.
SS-CO may be invoked in two ways depending on whether the network connection is
...