SIST ETS 300 259 E1:2005

Private Telecommunication Network (PTN); Inter-exchange signalling protocol; Path replacement additional network feature

Stage 3 of additional network feature path replacement at Q ref pt. See DTR/ECMA-0002 (ECMA-TR/SVC) for service description. See ENV41005 for definition of stage 3. See ENV41004 for definition of Q reference point. To contain PICS proforma.

Zasebno telekomunikacijsko omrežje (PTN) – Medcentralni signalizacijski protokol - Dodatna omrežna lastnost (ANF): nadomestitev poti

General Information

• Status: Published
• Publication Date: 30-Apr-2005
• ICS: 33.040.35 - Telephone networks
• Technical Committee: SPN - Services and Protocols for Networks
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-May-2005
• Due Date: 01-May-2005
• Completion Date: 01-May-2005
• Mandate: T-75C.3
• Ref Project: ETSI ETS 300 259 ed.1 (1993-11) - Private Telecommunication Network (PTN); Inter-exchange signalling protocol; Path replacement additional network feature

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ETS 300 259 E1:2005
01-maj-2005
Zasebno telekomunikacijsko omrežje (PTN) – Medcentralni signalizacijski protokol
- Dodatna omrežna lastnost (ANF): nadomestitev poti
Private Telecommunication Network (PTN); Inter-exchange signalling protocol; Path
replacement additional network feature
Ta slovenski standard je istoveten z: ETS 300 259 Edition 1
ICS:
33.040.35 Telefonska omrežja Telephone networks
SIST ETS 300 259 E1:2005 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 259 E1:2005

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SIST ETS 300 259 E1:2005
EUROPEAN ETS 300 259
TELECOMMUNICATION November 1993
STANDARD
Source: ETSI TC-ECMA Reference: DE/ECMA-00055
ICS: 33.080
PTN, ECMA-176, QSIG-PR
Key words:
Private Telecommunication Network (PTN);
Inter-exchange signalling protocol
Path replacement additional network feature
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 1993. All rights reserved.
New presentation - see History box

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ETS 300 259: November 1993
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 Branching PTNX .8
4.3 Co-operating PTNX .8
4.4 End PTNX.8
4.5 Preceding PTNX .9
4.6 Replaced connection .9
4.7 Requesting PTNX .9
4.8 Retained connection .9
4.9 Subsequent PTNX .9
5 List of acronyms .9
6 Signalling protocol for the support of ANF-PR .10
6.1 ANF-PR description .10
6.2 ANF-PR operational requirements.10
6.2.1 Requirements on the Co-operating PTNX .10
6.2.2 Requirements on the Requesting PTNX .10
6.2.3 Requirements on a Transit PTNX .11
6.2.3.1 Transit PTNX Involved in the replaced connection.11
6.2.3.2 Transit PTNX Involved in the new connection.11
6.2.3.3 Transit PTNX Involved in the retained connection .11
6.2.3.4 Branching PTNX.12
6.3 ANF-PR coding requirements.13
6.3.1 Operations.13
6.3.2 Information elements.16
6.3.2.1 Facility information element.16
6.3.2.2 Other information elements .16
6.3.3 Messages.16
6.4 ANF-PR state definitions.17
6.4.1 States at the Requesting PTNX .17
6.4.1.1 State PR-Req-Idle.17
6.4.1.2 State PR-Req-Initiated.17
6.4.1.3 State PR-Req-Completing .17
6.4.2 States at the Co-operating PTNX.17
6.4.2.1 State PR-Coop-Idle.17
6.4.2.2 State PR-Coop-Establishment.17
6.4.2.3 State PR-Coop-Retain.17
6.4.3 States at a Transit PTNX on the retained path, including the Branching
PTNX.17
6.4.3.1 State PR-Transit-Idle .17
6.4.3.2 State PR-Transit-Establishment .17
6.4.3.3 State PR-Transit-Retain .17
6.5 ANF-PR signalling procedures.18
6.5.1 Actions at the Requesting PTNX.18
6.5.1.1 Normal procedures.18
6.5.1.2 Exceptional procedures .19
6.5.2 Actions at the Co-operating PTNX .19
6.5.2.1 Normal procedures.20

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6.5.2.2 Exceptional procedures . 21
6.5.3 Actions at a Co-operating/Requesting PTNX in the case of a trombone
connection . 21
6.5.4 Actions at a Transit PTNX . 21
6.6 ANF-PR optional signalling procedures for retention of part of the old connection. 21
6.6.1 Actions at the Requesting PTNX . 21
6.6.2 Actions at the Co-operating PTNX. 21
6.6.2.1 Normal procedures . 22
6.6.2.2 Exceptional procedures . 22
6.6.3 Actions at a Transit PTNX on the retained connection. 22
6.6.3.1 Able to retain old connection as far as Subsequent PTNX. 23
6.6.3.2 Unable to retain old connection as far as Subsequent
PTNX . 23
6.6.4 Actions at a Transit PTNX on the new connection or replaced connection. 24
6.7 ANF-PR impact of interworking with public ISDNs. 25
6.8 ANF-PR impact of interworking with non-ISDNs. 25
6.9 ANF-PR parameter values (timers). 25
6.9.1 Timer T1 . 25
6.9.2 Timer T2 . 25
6.9.3 Timer T3 . 26
6.9.4 Timer T4 . 26
Annex A (normative): Protocol Implementation Conformance Statement (PICS) proforma . 27
A.1 Introduction. 27
A.2 Instructions for completing the PICS proforma . 27
A.2.1 General structure of the PICS proforma. 27
A.2.2 Additional Information. 28
A.2.3 Exception Information. 28
A.3 PICS Proforma for prETS 300 259. 28
A.3.1 Implementation identification . 28
A.3.2 Protocol summary. 29
A.3.3 General . 29
A.3.4 Procedures . 30
A.3.5 Coding . 31
A.3.6 Timers. 31
Annex B (informative): Imported ASN.1 definitions . 32
Annex C (informative): Examples of message sequences. 34
C.1 Example message sequence for normal operation. 35
C.2 Example message sequence for case of congestion encountered at Transit PTNX. 36
C.3 Example message sequence for normal operation, retaining part of the old connection . 37
C.4 Example message sequence for case of congestion encountered at Transit PTNX,
after attempting to retain part of the old connection. 38
C.5 Example message sequence for normal operation, retaining all of the old connection. 39
Annex D (informative): Specification and Description Language (SDL) representation of procedures. 40
D.1 SDL representation of ANF-PR at the Requesting PTNX. 40
D.2 SDL representation of ANF-PR at the Co-operating PTNX . 42
D.3 SDL representation of ANF-PR at a Transit PTNX on the retained connection. 43
History. 44

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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 CCITT and is
also within the framework of standards for open systems interconnection as defined by ISO.
This particular ETS specifies the signalling protocol for use at the Q reference point in support of the Path
Replacement additional network feature.
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, 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 voting process for this ETS it has been agreed
that this ETS will not be converted to the ETSI stylesheet.

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1 Scope
This ETS specifies the signalling protocol for the support of the Path Replacement additional
network feature (ANF-PR) at the Q reference point between Private Telecommunication Network
Exchanges (PTNXs) connected together within a Private Telecommunication Network (PTN).
ANF-PR is a feature which applies to an established call, allowing that call's connection through
the PTN to be replaced by a new connection.
The Q reference point is defined in ENV 41004. 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 prETS 300 258.
Service specifications are produced in three stages and according to the method specified in
ENV 41005.
The signalling protocol for ANF-PR 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 ANF specified in this ETS and other
supplementary services and ANFs 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 A.
3 References
ENV 41004 Reference configuration for connectivity relations of private
telecommunication network exchanges (1989).
ENV 41005 Method for the specification of basic and supplementary services of
private telecommunication networks (1989).
ENV 41007 Definition of terms in private telecommunication networks (1989).
ETS 300 171 Private Telecommunication Network (PTN); Specification, functional
models and information flows, Control aspects of circuit mode basic
services (1992).
ETS 300 172 Private Telecommunication Network (PTN); Inter-exchange signalling
protocol, Circuit mode basic services (1992).
ETS 300 189 Private Telecommunication Network (PTN); Addressing (1992).
ETS 300 196 ISDN - Generic Functional Protocol for the Support of Supplementary
Services - DSS1 Protocol
ETS 300 239 Private Telecommunication Network (PTN); Signalling between
private telecommunication exchanges, Generic functional protocol for
the support of supplementary services (1993).
prETS 300 258 Private Telecommunication Networks (PTN); Specification, functional
models and information flows, Path replacement additional network
feature (1993).
prETS 300 261 Private Telecommunication Networks (PTN); Inter-exchange
signalling protocol, Call transfer supplementary service (1993).

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CCITT Recommendation I.112 Vocabulary of terms for ISDNs (1988).
CCITT Recommendation I.210 Principles of telecommunication services supported by an ISDN
and the means to describe them (1988).
CCITT Recommendation 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:
- ANF-PR user (prETS 300 258);
- Application Protocol Data Unit (APDU) (ETS 300 239);
- Basic Service (CCITT Recommendation I.210);
- Call, Basic Call (ETS 300 239);
- Connection (prETS 300 258);
- Incoming Gateway PTNX (ETS 300 172);
- Interpretation APDU (ETS 300 239);
- Network Facility Extension (NFE) (ETS 300 239);
- New Connection (prETS 300 258);
- Old Connection (prETS 300 258);
- Originating PTNX (ETS 300 172);
- Outgoing Gateway PTNX (ETS 300 172);
- Private (ENV 41007);
- Private Telecommunication Network Exchange (PTNX) (ENV 41007);
- Public ISDN (ENV 41007);
- Signalling (CCITT Recommendation I.112);
- Supplementary Service (CCITT Recommendation I.210);
- Supplementary Services Control Entity (ETS 300 239);
- Telecommunication Network (ENV 41007);
- Terminating PTNX (ETS 300 172);
- Transit PTNX (ETS 300 172);
- Trombone Connection (prETS 300 258);
- User (except in the context of ANF-PR user) (ETS 300 171).
4.2 Branching PTNX
The Transit PTNX at which the retained connection finishes and the new connection starts.
4.3 Co-operating PTNX
The End PTNX which initiates the establishment of the new connection towards other End
PTNX involved in the call.
4.4 End PTNX
Within the context of a call, a PTNX which is not acting as a Transit PTNX, i.e. an Originating
PTNX, a Terminating PTNX, an Incoming Gateway PTNX or an Outgoing Gateway PTNX.

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4.5 Preceding PTNX
The adjacent PTNX in the direction of the Co-operating PTNX, relative to a particular PTNX
involved in the old connection.
NOTE 1
This can be the Co-operating PTNX itself or a Transit PTNX.
4.6 Replaced connection
That part of the old connection which is not retained and is replaced by the new connection.
4.7 Requesting PTNX
The End PTNX which invokes ANF-PR and towards which the new connection is routed.
4.8 Retained connection
That part of the old connection which is retained and not replaced by the new connection.
4.9 Subsequent PTNX
The adjacent PTNX in the direction of the Requesting PTNX, relative to a particular PTNX
involved in the old connection.
NOTE 2
This can be the Requesting PTNX itself or a Transit PTNX.
5 List of acronyms
ANF Additional Network Feature
ANF-PR Path Replacement Additional Network Feature
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

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6 Signalling protocol for the support of ANF-PR
6.1 ANF-PR description
ANF-PR is invoked by an ANF-PR user for an established call, allowing that call's connection
through the PTN to be replaced by a new connection. If the new connection is required to satisfy
certain criteria, ANF-PR should be used in conjunction with other supplementary services
and/or ANFs. In the absence of specific criteria, the new connection should be established
using the routing rules which apply to basic call establishment.
NOTE 3
Annex A of prETS 300 258 gives examples of the circumstances under which ANF-PR can be
used and criteria which can govern the selection of the new connection.
The Requesting PTNX shall request the Co-operating PTNX to attempt the establishment of a
new connection from the Co-operating PTNX to the Requesting PTNX. If successful, the new
connection shall replace the old connection.
NOTE 4
The Requesting PTNX can be either End PTNX involved in a call, i.e. the Originating PTNX or
the Terminating PTNX or, in the case of interworking with another network, the Incoming
Gateway PTNX or Outgoing Gateway PTNX.
Optional procedures and coding are specified for allowing the retention of one or more elements
of the old connection, starting from the Co-operating PTNX and continuing as far as a Transit
PTNX, subject to any given criteria being achievable in that way. A new connection is
established from the Transit PTNX to the Requesting PTNX instead of from the Co-operating
PTNX to the Requesting PTNX.
6.2 ANF-PR operational requirements
6.2.1 Requirements on the Co-operating PTNX
ANF-PR shall be applicable to a call whose protocol control state, as defined in ETS 300 172,
is Active.
NOTE 5
State Active will have been reached as a result of ETS 300 172 call establishment
procedures, possibly in conjunction with supplementary service and/or ANF procedures.
ETS 300 172 protocol control procedures for call establishment at the outgoing side of an
inter-PTNX link shall apply to the establishment of the new connection. ETS 300 172 protocol
control procedures for call clearing shall apply to the release of the old connection in the
event of successful switch over to the new connection.
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 Requesting PTNX
ANF-PR shall be applicable to a call whose protocol control state, as defined in ETS 300 172,
is Active.
NOTE 6
State Active will have been reached as a result of ETS 300 172 call establishment
procedures, possibly in conjunction with supplementary service and/or ANF procedures.

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ETS 300 172 protocol control procedures for call establishment at the incoming side of an
inter-PTNX link shall apply to the establishment of the new connection. ETS 300 172 protocol
control procedures for call clearing shall apply to the release of the old connection in the
event of successful switch over to the new connection.
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
6.2.3.1 Transit PTNX Involved in the replaced connection
ANF-PR shall be applicable to a call whose protocol control state, as defined in ETS 300
172, on each of the two links (incoming and outgoing) is Active and whose call control
state, as defined in ETS 300 172 is TCC_Call_Active.
NOTE 7
State Active will have been reached as a result of ETS 300 172 call establishment
procedures, possibly in conjunction with supplementary service and/or ANF procedures.
ETS 300 172 protocol control and call control procedures for call clearing at a Transit
PTNX shall apply to the release of the old connection in the event of successful switch
over to the new connection.
Generic procedures for the call-related control of supplementary services, as specified in
ETS 300 239 for a Transit PTNX, shall apply. For ANF-PR the requirements are limited to
the passing on of Facility information elements for which the destination, as indicated in
the Network Facility Extension (NFE), is not the Transit PTNX.
6.2.3.2 Transit PTNX Involved in the new connection
ETS 300 172 protocol control and call control procedures for call establishment at a
Transit PTNX shall apply to the establishment of the new connection.
ETS 300 172 protocol control and call control procedures for call clearing at a Transit
PTNX shall apply to the release of the new connection in the event of failure to complete
ANF-PR successfully.
Generic procedures for the call-related control of supplementary services, as specified in
ETS 300 239 for a Transit PTNX, shall apply. For ANF-PR the requirements are limited to
the passing on of Facility information elements for which the destination, as indicated in
the Network Facility Extension (NFE), is not the Transit PTNX.
6.2.3.3 Transit PTNX Involved in the retained connection
The procedures below are applicable only if the optional procedures for retention of part of
the old connection (see subclause 6.6) are supported.
ANF-PR shall be applicable to a call whose protocol control state, as defined in ETS 300
172, on each of the two links (incoming and outgoing) is Active and whose call control
state, as defined in ETS 300 172 is TCC_Call_Active.
NOTE 8
State Active will have been reached as a result of ETS 300 172 call establishment
procedures, possibly in conjunction with supplementary service and/or ANF procedures.
Generic procedures for the call-related control of supplementary services, as specified in
ETS 300 239 for a Transit PTNX, shall apply.

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6.2.3.4 Branching PTNX
The procedures below are applicable only if the optional procedures for retention of part of
the old connection (see subclause 6.6) are supported.
ANF-PR shall be applicable to a call whose protocol control state, as defined in ETS 300
172, on each of the two links (incoming and outgoing) is Active and whose call control
state, as defined in ETS 300 172 is TCC_Call_Active.
NOTE 9
State Active will have been reached as a result of ETS 300 172 call establishment
procedures, possibly in conjunction with supplementary service and/or ANF procedures.
ETS 300 172 protocol control procedures for call establishment at the outgoing side of an
inter-PTNX link shall apply to the establishment of the new connection. ETS 300 172
protocol control procedures for call clearing shall apply to the release of the replaced
connection in the event of successful switch over to the new connection.
Generic procedures for the call-related control of supplementary services, as specified in
ETS 300 239 for a Transit PTNX, shall apply.

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6.3 ANF-PR coding requirements
6.3.1 Operations
The operations defined in Abstract Syntax Notation number 1 (ASN.1) in table 10 shall apply.
Table 11 - Operations in support of ANF-PR
Path-Replacement-Operations
{ccitt (0) identified-organisation (3) etsi (0)
qsig-path-replacement (259) pr-operations (0)}
DEFINITIONS EXPLICIT TAGS ::=
BEGIN
IMPORTS OPERATION, ERROR FROM Remote-Operation-Notation
{joint-iso-ccitt(2) remote-operations(4) notation (0)}
Extension FROM Manufacturer-specific-service-extension-definition
{ccitt(0) identified-organisation(3) etsi(0)
qsig-generic-procedures (239) msi-definition (0)}
notAvailable, supplementaryServiceInteractionNotAllowed FROM General-Errors
{ccitt(0) identified-organisation(3) etsi(0) 196 general-errors (2)}
invalidReroutingNumber, unrecognizedCallIdentity,
establishmentFailure, CallIdentity FROM Call-Transfer-Operations
{ccitt(0) identified-organisation (3) etsi(0) qsig-call-transfer (261)
call-transfer-operations (0)}
PartyNumber FROM Addressing-Data-Elements
{ccitt (0) identified-organisation (3) etsi(0)196 addressing-data-elements(6)};
-- Note. The definition of PartyNumber is reproduced in annex B.
ptn OBJECT IDENTIFIER ::= {iso(1) identified-organisation(3) icd-ecma (0012)
private-isdn-signalling-domain (9)}
PathReplacePropose ::= OPERATION
ARGUMENT PRProposeArg
ERRORS {
notAvailable,
temporarilyUnavailable,
criteriaPermanentlyUnachievable,
criteriaTemporarilyUnachievable,
invalidReroutingNumber,
unrecognizedCallIdentity,
establishmentFailure,
collision,
supplementaryServiceInteractionNotAllowed,
unspecified
}

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Table 1 - Operations in support of ANF-PR (continued)
PathReplaceSetup ::= OPERATION
ARGUMENT PRSetupArg
RESULT DummyResult
ERRORS {
criteriaPermanentlyUnachievable,
criteriaTemporarilyUnachievable,
invalidReroutingNumber,
unrecognizedCallIdentity,
temporarilyUnavailable,
unspecified
}
PathReplaceRetain ::= OPERATION
ARGUMENT PRRetainArg
RESULT DummyResult
ERRORS {
notAvailable,
temporarilyUnavailable,
criteriaPermanentlyUnachievable,
criteriaTemporarilyUnachievable,
invalidReroutingNumber,
unrecognizedCallIdentity,
establishm
...