ETSI ETR 150 ed.1 (1994-09)

SLOVENSKI STANDARD
SIST-TP ETSI/ETR 150 E1:2005
01-april-2005
9PHVQLN91DþUWRYDQMHMDYQHJDNRPXWLUDQHJDWHOHIRQVNHJDRPUHåMD3671
V5 interface; Public Switched Telephone Network (PSTN) mappings
Ta slovenski standard je istoveten z: ETR 150 Edition 1
ICS:
33.040.35 Telefonska omrežja Telephone networks
SIST-TP ETSI/ETR 150 E1:2005 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the

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.

Foreword .......................................................................................................................................................5

1 Scope ..................................................................................................................................................7

2 References..........................................................................................................................................7

3 Abbreviations.......................................................................................................................................7

4 General information on the mappings layout.......................................................................................7

5 Mappings.............................................................................................................................................9

5.1 V5 PSTN signal flows for a BT network...............................................................................9

5.1.1 Case A: Subscriber A calling and subscriber A clearing ...............................10

5.1.2 Case B: Subscriber B called and subsequently cleared................................11

calling PBX ....................................................................................................12

PBX ...............................................................................................................13

5.2 V5 PSTN signal flows for an Italian network......................................................................14

5.2.1 Case A: Subscriber A calling and subscriber A clearing ...............................15

called and subsequently cleared ...................................................................16

PABX.............................................................................................................17

service to call subscriber C and to start a three party conference ................18

5.3 V5 PSTN signal flows for an Austrian network ..................................................................19

5.3.1 Case A.1: Active call, valid for all access types; subscriber A clearing.........23

5.3.2 Case A.2: Active call, valid for all access types; meter pulse transmission ..24

5.3.3 Case A.3: Active call, valid for all access types; call hold .............................24

5.3.4 Case B: Passive call, access type = main station; subscriber B is clearing..25

subscriber B is clearing .................................................................................26

DDI; subscriber B is clearing.........................................................................27

5.3.7 Case E.1: Release initiated by partner, force release (normal sequence)....28

5.3.8 Case E.2: Release initiated by partner, force release (failure situation) .......28

5.4 V5 PSTN signal flows for a German Telekom network .....................................................29

5.4.1 Case A: Subscriber A calling and subscriber A clearing ...............................30

receiving).......................................................................................................31

5.4.3 Case C: Subscriber B called and subscriber B clearing................................32

receiving) for a German PBX with DDI..........................................................33

with DDI.........................................................................................................34

with DDI.........................................................................................................36

with DDI.........................................................................................................37

Annex A: List of contributors.......................................................................................................................39

History..........................................................................................................................................................40

This ETSI Technical Report (ETR) was produced by the Signalling Protocols and Switching (SPS)

Technical Committee of the European Telecommunications Standards Institute (ETSI).

ETRs are informative documents resulting from ETSI studies which are not appropriate for European

Telecommunication Standard (ETS) or Interim European Telecommunication Standard (I-ETS) status. An

ETR may be used to publish material which is either of an informative nature, relating to the use or the

application of ETSs or I-ETSs, or which is immature and not yet suitable for formal adoption as an ETS or

This ETR is a re-issue of SPS-TR 002 (1993) to make its contents publicly available.

This ETSI Technical Report (ETR) provides examples of how national protocols may be mapped onto the

common PSTN protocol in the V5 interface as specified in ETS 300 324-1 [1]. These examples are

intended for information only and do not create specification requirements for any equipment. It is up to

national governing bodies and/or network operators to create official mappings for each of their national

analogue protocols onto the PSTN V5 protocol. Without such required mappings, integration among

NOTE: Network operators contributing to the definition of this ETR reserve the right to change

procedures in their PSTN protocols without giving notification to the users of this ETR.

For the examples given, not all possible call scenarios or error conditions will be discussed. These have to

be specified in the official mappings created by national governing bodies and/or network operators.

Where particular countries or national protocols are mentioned in this ETR, the example given is only one

potential mapping; other mappings are also possible. This ETR is not to be considered to constitute

According to the V5 interface specification, a large number of parameters (e.g., timers, cadences,

voltages, frequencies, etc.) have to be pre-defined. Default values may also be pre-defined for some

provisionable parameters. These may be discussed in this ETR, but it is the responsibility of national

governing bodies and/or network operators to specify these values fully. All values discussed in this text

[1] ETS 300 324-1 (1994): "Signalling Protocols and Switching (SPS); V interfaces

In the following flow diagrams, time is shown running from top to bottom, with no scale. The vertical bars

Line conditions detected or forwarded on the user line and primitives originated by the National Protocol in

the LE have been mapped onto Function Elements (FE) according to tables 1 and 2 of the V5.1 interface

A brief description of the physical conditions detected or generated on the PSTN line is shown in brackets

The diagrams do not give information about the timers involved in the V5 PSTN protocol message

States of the PSTN protocol are shown on the right side of the vertical bars only when a state transition

The message types visible on the V5 interface are represented in capital letters and are given along with

an indication of their direction in the centre portion of the diagrams. Below the message, a further

explanation of the structure of the message itself is given (i.e. information element and line signal). For

editorial reasons, some abbreviations have been adopted to represent the information elements. The

An example is given in figure 2 of how an ESTABLISH message carrying an off hook indication (Steady

The SIGNAL ACK messages, used to acknowledge SIGNAL messages, may occur at any time during the

The occurrence of the SIGNAL ACK message is independent from the mappings and is therefore not

This Clause contains mappings supplied by European national governing bodies and/or network

operators. The mappings have been grouped according to the nation which has supplied them.

NOTE 1: It has been assumed that only one dialled digit is sent for this example.

NOTE 2: The exchange release signal is a 100 ms reduction in line current to less than 1 mA,

allocated to a pulse type and should be designed as uninterruptable. As shown in the

NOTE 3: For the example shown, it was decided that the AN should acknowledge the end of

until that acknowledgement had been received. This makes sure that the 100 ms pulse

NOTE 1: It is assumed that the cadenced-ring information element would point to a pre-

provisioned type of ringing which reverses the polarity of the line whilst ringing takes

NOTE 2: It is assumed that the ringing is stopped by the telephone being taken off hook and that

NOTE 3: The end of call signal shown is a 100 ms reduction in line current to less than 1 mA.

This should be allocated to a pulse type and should be designated uninterruptable. As

NOTE 4: The exchange release signal is a 100 ms reduction in line current to less than 1 mA,

allocated to a pulse type and should be designated uninterruptable. As shown in the

NOTE 2: The seize acknowledgement is handled autonomously as there is not enough time for

NOTE 3: The exchange release acknowledgement signal is a timed disconnection of both a-

and b-wires and has been mapped onto a pulsed no-battery information element. This

should be an uninterruptable pulse and the signal sent after it (normal battery) should

NOTE 1: It is assumed that the cadenced-ring information element would point to a pre-

provisioned type of ringing which reverses the polarity whilst ringing takes place. The

NOTE 2: It is assumed that the ringing is stopped by the telephone being taken off hook and that

NOTE 3: The exchange release acknowledgement message is a timed disconnection of both a-

and b-wires and has been mapped onto a pulsed no-battery information element. This

should be an uninterruptable pulse and the signal sent after it (normal battery) should

5.1.3 Case C: Subscriber A calling and subscriber A clearing for an earth-calling PBX