SIST ETS 300 324-3:1997

SLOVENSKI STANDARD
SIST ETS 300 324-3:1997
01-november-1997
Signalizacijski protokoli in komutacija (SPS) - Vmesniki "V" pri digitalnih krajevnih
centralah (LE) - Vmesnik V5.1 za podporo dostopovnega omrežja (AN) - 3. del:
Zgradba preskušalnega niza in namen preskušanja (TSS&TP) za omrežno plast na
strani dostopovnega omrežja (AN)
Signalling Protocols and Switching (SPS) - V interfaces at the digital Local Exchange
(LE); V5.1 interface for the support of Access Network (AN); Part 3: Test Suite Structure
and Test Purposes (TSS&TP) specification for the network layer (AN side)
Ta slovenski standard je istoveten z: ETS 300 324-3 Edition 1
ICS:
33.040.30 Komutacijski in signalizacijski Switching and signalling
sistem systems
35.100.30 Omrežni sloj Network layer
SIST ETS 300 324-3:1997 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ETS 300 324-3:1997

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SIST ETS 300 324-3:1997
EUROPEAN ETS 300 324-3
TELECOMMUNICATION October 1995
STANDARD
Source: ETSI TC-SPS Reference: DE/SPS-03003.3-1
ICS: 33.020, 33.080, 35.100.30
V interface, V5 interface, PSTN, ISDN, AN, TSS&TP, testing, layer 3
Key words:
Signalling Protocols and Switching (SPS);
V interfaces at the digital Local Exchange (LE);
V5.1 interface for the support of Access Network (AN);
Part 3: Test Suite Structure and Test Purposes (TSS&TP)
specification for the network layer (AN side)
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 1995. 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 .7
1 Scope .9
2 Normative references.9
3 Definitions and abbreviations .10
3.1 Definitions .10
3.2 Abbreviations .11
4 Test Suite Structure (TSS) .12
4.1 TSS overview.12
4.2 Test groups.13
4.2.1 Protocol groups .13
4.2.1.1 Control protocol .13
4.2.1.2 PSTN protocol .14
4.2.2 Main test groups.14
4.2.2.1 Basic Interconnection (IT) tests.14
4.2.2.2 Capability (CA) tests .14
4.2.2.3 Valid Behaviour (BV) tests.14
4.2.2.4 Inopportune Behaviour (BO) tests .14
4.2.2.5 Invalid Behaviour (BI) tests.14
4.2.2.6 Timer (TI) expiry and counter mismatch tests.14
4.2.2.6.1 Timer expiry and counters of the
Control protocol.15
4.2.2.6.2 Timer expiry and counters of the
PSTN protocol .15
4.2.2.6.3 Timer expiry and counters of the AN
system management .15
4.3 Test step structure.15
4.3.1 State transitions.15
4.3.1.1 Startup of V5.1 interface.16
4.3.1.2 Common control protocol (system management) .17
4.3.1.3 Control protocol (PSTN port FSM) .17
4.3.1.4 Control protocol (ISDN-BA port FSM) .17
4.3.1.5 PSTN protocol .17
4.3.2 Preconditions.18
4.3.3 Preambles .18
4.3.4 Postambles.18
4.3.5 Status verification .18
4.3.5.1 PSTN protocol .18
4.3.5.2 Port control protocol.19
4.3.5.3 Common control protocol .19
4.3.6 Common test steps .19
4.4 Defaults.19
4.5 Abstract Service Primitives (ASPs) and Protocol Data Units (PDUs).19
4.5.1 ASPs .19
4.5.2 PDUs .19
4.5.2.1 Common control protocol .19
4.5.2.2 Port control protocol.19
4.5.2.3 PSTN protocol .19
4.5.3 Information elements.20
4.5.3.1 Variable length information elements .20
4.5.3.1.1 Control protocol.20
4.5.3.1.2 PSTN protocol .20
4.5.3.2 Single octet information elements .20
4.5.3.2.1 Control protocol.20

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4.5.3.2.2 PSTN protocol. 20
4.6 Timers and counters of the Abstract Test Suite (ATS) . 20
5 Test Purposes (TPs). 22
5.1 Introduction. 22
5.1.1 TP naming convention. 22
5.1.2 Source of TP definition . 23
5.1.3 Test strategy . 23
5.1.4 Requirements not covered by TPs . 23
5.1.5 Initial state. 24
5.1.6 Test and data configuration requirements. 24
5.2 Control protocol. 24
5.2.1 Basic interconnection tests (V5NWKAN/CTRL/IT). 24
5.2.2 Capability tests (V5NWKAN/CTRL/CA). 24
5.2.3 Valid behaviour tests (V5NWKAN/CTRL/BV). 24
5.2.3.1 V5NWKAN/CTRL/BV/COM . 24
5.2.3.1.1 V5NWKAN/CTRL/BV/COM/TRANS . 24
5.2.3.1.2 V5NWKAN/CTRL/BV/COM/REST. 25
5.2.3.1.3 V5NWKAN/CTRL/BV/COM/REVY. 25
5.2.3.2 V5NWKAN/CTRL/BV/PORT. 27
5.2.3.2.1 V5NWKAN/CTRL/BV/PORT/TRANS. 27
5.2.3.2.2 V5NWKAN/CTRL/BV/PORT/PSTN . 27
5.2.3.2.3 V5NWKAN/CTRL/BV/PORT/ISDNBA. 29
5.2.4 Inopportune behaviour tests (V5NWKAN/CTRL/BO) . 32
5.2.4.1 V5NWKAN/CTRL/BO/COM . 32
5.2.4.1.1 V5NWKAN/CTRL/BO/COM/TRANS. 32
5.2.4.1.2 V5NWKAN/CTRL/BO/COM/REVY . 32
5.2.4.2 V5NWKAN/CTRL/BO/PORT . 33
5.2.4.2.1 V5NWKAN/CTRL/BO/PORT/TRANS . 33
5.2.4.2.2 V5NWKAN/CTRL/BO/PORT/PSTN. 33
5.2.4.2.3 V5NWKAN/CTRL/BO/PORT/ISDNBA . 33
5.2.5 Invalid behaviour tests (V5NWKAN/CTRL/BI). 34
5.2.5.1 V5NWKAN/CTRL/BI/COM. 34
5.2.5.1.1 V5NWKAN/CTRL/BI/COM/TRANS. 34
5.2.5.2 V5NWKAN/CTRL/BI/PORT . 35
5.2.5.2.1 V5NWKAN/CTRL/BI/PORT/TRANS . 35
5.2.6 Timer expiry and counter mismatch tests (V5NWKAN/CTRL/TI). 36
5.2.6.1 V5NWKAN/CTRL/TI/COM. 36
5.2.6.1.1 V5NWKAN/CTRL/TI/COM/TRANS. 36
5.2.6.2 V5NWKAN/CTRL/TI/PORT . 36
5.2.6.2.1 V5NWKAN/CTRL/TI/PORT/TRANS . 36
5.3 PSTN protocol. 37
5.3.1 Basic interconnection tests (V5NWKAN/PSTN/IT). 37
5.3.2 Capability tests (V5NWKAN/PSTN/CA) . 37
5.3.3 Valid behaviour tests (V5NWKAN/PSTN/BV). 37
5.3.3.1 V5NWKAN/PSTN/BV/0. 38
5.3.3.2 V5NWKAN/PSTN/BV/1. 38
5.3.3.3 V5NWKAN/PSTN/BV/2. 39
5.3.3.4 V5NWKAN/PSTN/BV/3. 40
5.3.3.5 V5NWKAN/PSTN/BV/4. 41
5.3.3.6 V5NWKAN/PSTN/BV/5. 42
5.3.3.7 V5NWKAN/PSTN/BV/6. 43
5.3.3.8 V5NWKAN/PSTN/BV/7. 44
5.3.4 Inopportune behaviour tests (V5NWKAN/PSTN/BO). 45
5.3.4.1 V5NWKAN/PSTN/BO/0 . 45
5.3.4.2 V5NWKAN/PSTN/BO/1 . 46
5.3.4.3 V5NWKAN/PSTN/BO/2 . 46
5.3.4.4 V5NWKAN/PSTN/BO/3 . 47
5.3.4.5 V5NWKAN/PSTN/BO/4 . 47
5.3.4.6 V5NWKAN/PSTN/BO/5 . 48
5.3.4.7 V5NWKAN/PSTN/BO/6 . 48
5.3.4.8 V5NWKAN/PSTN/BO/7 . 49
5.3.5 Invalid behaviour tests (V5NWKAN/PSTN/BI). 49

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5.3.5.1 V5NWKAN/PSTN/BI/1.49
5.3.5.2 V5NWKAN/PSTN/BI/5.51
5.3.6 Timer expiry and counter mismatch tests (V5NWKAN/PSTN/TI).52
5.3.6.1 V5NWKAN/PSTN/TI/2.52
5.3.6.2 V5NWKAN/PSTN/TI/3.52
5.3.6.3 V5NWKAN/PSTN/TI/4.52
5.3.6.4 V5NWKAN/PSTN/TI/5.52
5.3.6.5 V5NWKAN/PSTN/TI/7.53
Annex A (informative): Bibliography.54
History.55

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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).
This ETS is part 3 of a multi-part standard covering the V5.1 interface as described below:
Part 1: "V5.1 interface specification";
Part 2: "Protocol Implementation Conformance Statement (PICS) proforma";
Part 3: "Test Suite Structure and Test Purposes (TSS&TP) specification for the network layer
(AN side)";
Part 4: "Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing
(PIXIT) proforma specification for the network layer (AN side)";
Part 5: "TSS&TP specification for the network layer (LE side)";
Part 6: "ATS and partial PIXIT proforma specification for the network layer (LE side)";
Part 7: "TSS&TP specification for the data link layer";
Part 8: "ATS and partial PIXIT proforma specification for the data link layer";
Part 9: "Test specification for the physical layer".
Transposition dates
Date of adoption of this ETS: 27 October 1995
Date of latest announcement of this ETS (doa): 31 January 1996
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 July 1996
Date of withdrawal of any conflicting National Standard (dow): 31 July 1996

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1 Scope
This third part of ETS 300 324 contains the Test Suite Structure (TSS) and Test Purposes (TPs) for the
Network layer (NWK) and parts of the system management of the Access Network (AN) side of a V5.1
interface.
The objective of this ETS is to provide conformance tests giving a high probability of inter-operability of an
AN and a Local Exchange (LE) from different manufacturers over the V5.1 interface. This ETS covers only
the procedures described in ETS 300 324-1 [1].
ISO/IEC 9646-1 [5] is used as the basis for the methodology of conformance testing.
Concerning the Public Switched Telephone Network (PSTN) protocol testing, only the procedures defined
in ETS 300 324-1 [1] are covered by the tests defined in this ETS. An Implementation Under Test (IUT),
however, will have implemented a national PSTN protocol part as well. This requires that the tester
generates messages containing the national PSTN protocol specific optional Information Elements (IEs),
otherwise the IUT would not act on messages according to the PSTN protocol procedure definition.
However, this does not provide a comprehensive test of the national PSTN protocol mapping
specification, which is outside the scope of this ETS.
As the tests use PSTN messages containing optional IEs according to national specifications, the test
result is only valid for the implemented national mapping of the V5.1 PSTN protocol.
This ETS does not cover tests related to functions of the bearer channel. Those functions should be
tested in conjunction with testing of the national PSTN protocol mapping specification.
This ETS contains no requirements concerning NWK tests for Integrated Services Digital Network Basic
Access (ISDN-BA).
Annex A lists the bibliography.
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] ETS 300 324-1 (1994) including amendment A1: "Signalling Protocols and
Switching (SPS), V interfaces at the digital Local Exchange (LE); V5.1 interface
for the support of Access Network (AN); Part 1: V5.1 interface specification".
[2] ETS 300 324-2 (1994): "Signalling Protocols and Switching (SPS), V interfaces
at the digital Local Exchange (LE); V5.1 interface for the support of Access
Network (AN); Part 2: Protocol Implementation Conformance Statement (PICS)
proforma".
[3] ETS 300 297: "Integrated Services Digital Network (ISDN); Access Digital
Section for ISDN basic rate".
[4] ISO 7498: "Information Processing Systems - Open Systems Interconnection -
Basic Reference Model".
[5] ISO/IEC 9646-1: "Information technology - Open Systems Interconnection -
Conformance testing methodology and framework - Part 1: General concepts".

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3 Definitions and abbreviations
3.1 Definitions
For the purposes of this ETS, the following definitions apply, together with those given in
ETS 300 324-1 [1]:
Abstract Test Case (ATC): Refer to ISO/IEC 9646-1 [5].
Abstract Test Suite (ATS): Refer to ISO/IEC 9646-1 [5].
current provisioning variant: Identifier for the presently active data set.
data link layer: Refer to ISO 7498 [4].
Implementation Under Test (IUT): Refer to ISO/IEC 9646-1 [5].
incorrect IE: Specified IE carrying IE types not defined in ETS 300 324-1 [1].
invalid IE: PSTN IE not according to national specific requirements.
invalid Protocol Data Unit (PDU): PDU which contains incorrect message format.
invalid PSTN message: PSTN message carrying IEs not according to national specific requirements.
Lower Tester (LT): Refer to ISO/IEC 9646-1 [5].
Network Layer (NWK): Refer to ISO 7498 [4].
Network Termination (NT): An equipment providing the network side at the ISDN user-network interface
for the basic access.
NOTE: This term is used in this ETS to indicate network-terminating aspects of NT1 and NT2.
new provisioning variant: Identifier for the data set which was announced to the IUT to become the next
active data set through reprovisioning.
physical layer: Refer to ISO 7498 [4].
Protocol Implementation Conformance Statement (PICS): Refer to ISO/IEC 9646-1 [5].
PICS proforma: Refer to ISO/IEC 9646-1 [5].
specified IE: IE identifier defined in ETS 300 324-1 [1].
System Under Test (SUT): Refer to ISO/IEC 9646-1 [5].
Test Purpose (TP): Refer to ISO/IEC 9646-1 [5].
unknown provisioning variant: Identifier for a non-available data set.
unspecified IE: IE identifier not defined in ETS 300 324-1 [1].
valid IE: PSTN IE according to national specific requirements.
valid PSTN message: PSTN message carrying IEs according to national specific requirements.

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3.2 Abbreviations
For the purposes of this ETS, the following abbreviations apply:
AN Access Network
ASP Abstract Service Primitive
ATC Abstract Test Case
ATS Abstract Test Suite
BI Invalid Behaviour
BO Inopportune Behaviour
BV Valid Behaviour
CA Capability
COM Common control protocol
CTRL Control
DSAP Data link Service Access Point
FE Function Element
FSM Finite State Machine
ID Identifier
IE Information Element
ISDN Integrated Services Digital Network
ISDN-BA ISDN Basic Access
IT Basic Interconnection
IUT Implementation Under Test
L3addr Layer 3 address
LE Local Exchange
LT Lower Tester
MDU Management Data Unit
MPH Management Physical Layer
NT Network Termination
NWK Network layer
PDU Protocol Data Unit
PICS Protocol Implementation Conformance Statements
PL Permanent Line
PSTN Public Switched Telephone Network
REST Restart
REVY Verify and Reprovisioning
SUT System Under Test
TE Terminal Equipment (ISDN or PSTN)
TI Timer
TP Test Purpose
TSS Test Suite Structure
UNI User Network Interface

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4 Test Suite Structure (TSS)
4.1 TSS overview
Figure 1 shows the structure of the V5.1 AN side NWK test suite.
V5NW KAN CTRL IT
CA
BV
COM TRANS/PROTOCOL
S YS_MAN/ RES T
SYS_MAN REVY
PORT
TRANS/PROTOCOL
PSTN
IS D N -B A
BO
COM TRANS/PROTOCOL
SYS_MAN REVY
PORT
TRANS/PROTOCOL
PSTN
ISDN-BA
BI
COM TRANS/PROTOCOL
PORT
TRANS/PROTOCOL
TI
COM TRANS/PROTOCOL
PORT
TRANS/PROTOCOL
PSTN
IT
CA
BV
STATE
BO
STATE
BI
STATE
TI
STATE
Figure 1: NWK AN TSS

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4.2 Test groups
Figure 2 gives an overview of the various protocol entities of a V5.1 interface. Table 1 maps each protocol
entity on tested protocol groups.
UNI
FE
DL-DATA
AN_PSTN_DL
AN_PSTN
AN_PSTN_UP
MDU-CTRL
MDL PH-DATA
MPH
V5
AN_PSTN_port_FSM
MPH
AN_V5_FSM
AN_SM
MPH
AN_ISDN_port_FSM
MDL
PH-DATA
PH
MDU-CTRL
DL-DATA
FE
AN_CTRL_DL
AN_CTRL
AN_ISDN_UP
Figure 2: Network Layer AN - protocol entity overview
Table 1: Names used in figure 2 that correspond to ETS 300 324-1 [1]
NWK protocol entities Protocol entities defined in Protocol group reference
ETS 300 324-1 [1]
AN_PSTN_UP AN_PSTN_user_port 4.2.1.1
AN_PSTN_port_FSM AN_PSTN_user_port_FSM 4.2.1.1
AN_ISDN_port_FSM AN_ISDN_BA_user_port_FSM 4.2.1.1
AN_ISDN_UP AN_ISDN_BA_user_port 4.2.1.1
AN_ISDN_PRA_user_port
AN_CTRL AN_control_protocol 4.2.1.1
AN_SYS AN_system_management 4.2.1.1
AN_PSTN AN_PSTN_protocol 4.2.1.2
4.2.1 Protocol groups
4.2.1.1 Control protocol
All tests in the Control protocol (V5NWKAN/CTRL) test group are intended to verify as thoroughly as
possible the various procedures of the AN_control_protocol entity. Depending on provisioning the
following configurations are covered:
AN_system_management: the startup, restart, re-provisioning and verification procedures of normal
operation of the AN_system_management (V5NWKAN/CTRL/BV/COM/REST, V5NWKAN/
CTRL/BV/COM/REVY) and V5NWKAN/CTRL/BO/COM/REVY) are tested.
AN_control_protocol: the normal and exceptional procedures of the AN_control_protocol are verified in
the test groups V5NWKAN/CTRL/BV/COM/TRANS, V5NWKAN/CTRL/BO/COM/TRANS,
V5NWKAN/CTRL/TI/COM/TRANS, V5NWKAN/CTRL/BV/PORT/TRANS, V5NWKAN/CTRL/BO/
PORT/TRANS and V5NWKAN/CTRL/TI/PORT/TRANS. Contents of the AN_control_protocol
values are not verified (e.g. the control function ID). The error handling procedures are verified in
test groups V5NWKAN/CTRL/BI/COM/TRANS and V5NWKAN/CTRL/BI/PORT/TRANS.

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AN_PSTN_user_port: the blocking, blocking request and co-ordinated unblocking procedures of the
AN_PSTN_user_port_FSM are verified in the test group V5NWKAN/CTRL/BV/PORT/PSTN. The
interworking of the AN_PSTN_user_port_FSM and the AN_PSTN_protocol entity is tested via the
AN_system_management.
AN_ISDN-BA_user_port: the blocking, blocking request, co-ordinated unblocking and activation/
deactivation procedures of the AN_ISDN-BA_user_port_FSM are verified in the test group
V5NWKAN/CTRL/BV/PORT/ISDNBA and V5NWKAN/CTRL/BO/PORT/ISDNBA.
4.2.1.2 PSTN protocol
All tests in the PSTN protocol (V5NWKAN/PSTN) test group are intended to verify as thoroughly as
possible the various procedures of the AN_PSTN_protocol entity.
The following PSTN procedures are covered:
- all path related normal operation procedures;
- significant path related exceptional procedures;
- the status enquiry procedure;
- the error handling procedures;
- the layer 3 error detection procedure;
- the port blocking procedure;
- the restart procedure.
4.2.2 Main test groups
4.2.2.1 Basic Interconnection (IT) tests
The IT test subgroup contains a basic set of TPs which assures that there is a sufficient conformance for
interconnection and that the chosen parameters are valid for the configuration.
4.2.2.2 Capability (CA) tests
Capability testing provides a limited testing to ascertain the capabilities stated in the PICS can be
observed.
4.2.2.3 Valid Behaviour (BV) tests
Predefined state transitions are considered as valid. The test purpose in the valid behaviour test subgroup
cover as far as reasonable the verification of the normal and exceptional procedures of the various FSMs.
A valid test is a test where the message sequence and the message contents is considered as valid (no
error indication shall be indicated).
4.2.2.4 Inopportune Behaviour (BO) tests
This test subgroup is intended to verify that the IUT is able to react properly in the case an inopportune
protocol event occurring. Such an event is syntactically correct but occurs when it is not expected and an
error indication is caused.
4.2.2.5 Invalid Behaviour (BI) tests
This test subgroup is intended to verify that the IUT is able to react properly having received an invalid
PDU. An invalid PDU is defined as a syntactically incorrect message and therefore an error indication is
caused.
4.2.2.6 Timer (TI) expiry and counter mismatch tests
Different timers and counters are defined to supervise the various state transitions. This test subgroup is
intended to verify that the Finite State Machine (FSM) is reacting properly to an expiry of one of the timers
or counter mismatch.

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4.2.2.6.1 Timer expiry and counters of the Control protocol
Refer to ETS 300 324-1 [1], table 58.
T01 PORT CONTROL message sent
T02 COMMON CONTROL message sent
4.2.2.6.2 Timer expiry and counters of the PSTN protocol
Refer to ETS 300 324-1 [1], table 28.
T1 Subscriber seizure/Line information ESTABLISH sent
T2 Time out T1 or T2
T3 DISCONNECT sent
Tr SIGNAL or PROTOCOL PARAMETER received
Tt SIGNAL sent
Refer to ETS 300 324-1 [1], subclause 13.5.5.
S(S) Sequence number to be sent/transmitted in next message
S(A) Sequence number on the last acknowledged message
S(R) Sequence number to be received in next message
M(S) Sequence number of transmitted message
M(R) Sequence number of next received message
4.2.2.6.3 Timer expiry and counters of the AN system management
Refer to ETS 300 324-1 [1], annex C, table C.1.
TR1 MDU-CTRL(restart request) to all PSTN protocol FSMs
TR2 MDU-CTRL(restart request) to CTRL protocol
TC1 CONTROL-DL establishment requested
TC2 CONTROL-DL establishment requested
TC3 PSTN-DL establishment requested
4.3 Test step structure
General dynamic behaviours are described in test steps which can be called from all ATCs within the
ATS:
state transitions (refer to subclause 4.3.1)
preconditions (refer to subclause 4.3.2)
preambles (refer to subclause 4.3.3)
postambles (refer to subclause 4.3.4)
status checks (refer to subclause 4.3.5)
common behaviours (refer to subclause 4.3.6)
4.3.1 State transitions
The following subclauses identify the test steps used in the ATS. In general, each test step represents a
state transition. For example in the PSTN protocol, PSTN_AN1_2 is the test step which brings the AN
PSTN_protocol_FSM from PSTN_path_state AN1 to PSTN_path_state AN2. The state transitions are
declared in the parenthesis (originating state - destination state) which follow the test step names.
Three groups of state transitions are defined:
STARTUP startup the V5.1 interface and put the IUT into the initial state as defined in subclause
5.1.5.
CTRL state transitions used to preamble and postamble the Control protocol before a test
purpose can be performed.

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PSTN state transitions used t
...