SIST-TP ETSI/ETR 150 E1:2005

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.

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SIST-TP ETSI/ETR 150 E1:2005

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SIST-TP ETSI/ETR 150 E1:2005
ETSI ETR 150
TECHNICAL September 1994
REPORT
Source: ETSI TC-SPS Reference: DTR/SPS-03036
ICS: 33.080
V5 interface, PSTN
Key words:
Signalling Protocols and Switching (SPS);
V5 interface
Public Switched Telephone Network (PSTN) mappings
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 1994. All rights reserved.
New presentation - see History box

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ETR 150: September 1994
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 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
5.1.3 Case C: Subscriber A calling and subscriber A clearing for an earth-
calling PBX .12
5.1.4 Case D: Subscriber B called and subsequently cleared for an earth-calling
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
5.2.2 Case B: Subscriber B, with identification of calling party service active,
called and subsequently cleared .16
5.2.3 Case C: Subscriber A called and subscriber A clearing for an Italian DDI
PABX.17
5.2.4 Case D: Subscriber A in conversation with B uses call hold supplementary
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
5.3.5 Case C: Passive call, access type = PABX with DC-based DDI;
subscriber B is clearing .26
5.3.6 Case D: Passive call, access type = PABX with pilot-frequency-based
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
5.4.2 Case B: Subscriber A calling and subscriber A clearing (meter pulses
receiving).31
5.4.3 Case C: Subscriber B called and subscriber B clearing.32
5.4.4 Case D: Subscriber A calling and subscriber A clearing (meter pulses
receiving) for a German PBX with DDI.33
5.4.5 Case E: Subscriber B called and subscriber B clearing for a German PBX
with DDI.34
5.4.6 Case F: Subscriber B called and subscriber B is busy for a German PBX
with DDI.36
5.4.7 Case G: Subscriber B called and subsequently cleared for a German PBX
with DDI.37
Annex A: List of contributors.39
History.40

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ETR 150: September 1994
Foreword
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
an I-ETS.
This ETR is a re-issue of SPS-TR 002 (1993) to make its contents publicly available.

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1 Scope
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
manufacturers will be difficult or impossible in that country.
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
requirements for any country or national protocol.
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
are only examples and do not constitute requirements.
2 References
For the purposes of this ETR, the following references apply:
[1] ETS 300 324-1 (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 1: V5.1 interface specification".
3 Abbreviations
For the purposes of this ETR, the following abbreviations apply:
AN Access Network
DDI Direct Dialling-In
DTMF Dual Tone Multi-Frequency
FE Function Element
LE Local Exchange
PABX Private Automatic Branch eXchange
PBX Private Branch eXchange
PSTN Public Switched Telephone Network
4 General information on the mappings layout
In the following flow diagrams, time is shown running from top to bottom, with no scale. The vertical bars
represent the following entity:
user port = national PSTN interface between subscriber equipment and Access
Network;
V5 AN side = V5 AN PSTN protocol entity;
V5 LE side = V5 LE PSTN protocol entity;
national PSTN protocol = national PSTN protocol implementation in the LE.

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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
specification, ETS 300 324-1 [1].
A brief description of the physical conditions detected or generated on the PSTN line is shown in brackets
below the function element, for example:
     user port        V5.1 AN side
digit 1    |   FE-line_signal   |
       |———————————————————————>|
       |  (line state sign.)  |
       |            |
Figure 1
The diagrams do not give information about the timers involved in the V5 PSTN protocol message
exchange (refer to table 28 of ETS 300 324-1 [1]).
States of the PSTN protocol are shown on the right side of the vertical bars only when a state transition
occurs (for further information refer to tables 29 to 31 of ETS 300 324-1 [1]).
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
following rules apply:
Pulse-notification = Pn
Autonomous-signalling-sequence = Asis
Sequence-response = Sr
Cadenced-ringing = Cr
Pulsed-signal = Ps
Steady-signal = Ss
Digit-signal = Ds
Resource unavailable = Ru
An example is given in figure 2 of how an ESTABLISH message carrying an off hook indication (Steady
signal) can be represented.
V5 AN side        V5 LE side
 |   ESTABLISH     |
 |———————————————————————>|
 |  Ss = off hook    |
 |            |
Figure 2
The SIGNAL ACK messages, used to acknowledge SIGNAL messages, may occur at any time during the
PATH ACTIVE state and their position within the protocol is arbitrary.
The occurrence of the SIGNAL ACK message is independent from the mappings and is therefore not
shown in the following drawings.

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5 Mappings
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.
5.1 V5 PSTN signal flows for a BT network
Notes on case A: A direct exchange line
Subscriber A calling and subscriber A clearing.
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,
and has been mapped onto a reduced battery information element. This should be
allocated to a pulse type and should be designed as uninterruptable. As shown in the
example, the acknowledgement-request option has been used.
NOTE 3: For the example shown, it was decided that the AN should acknowledge the end of
exchange release signal and that the LE should not send the DISCONNECT message
until that acknowledgement had been received. This makes sure that the 100 ms pulse
is correctly transported to the customer's equipment.
Notes on case B: A direct exchange line
Subscriber B called and subsequently cleared.
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
place.
NOTE 2: It is assumed that the ringing is stopped by the telephone being taken off hook and that
no specific message is required from the exchange.
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
shown in the example, the acknowledgement-request option has been used.
NOTE 4: The exchange release signal is a 100 ms reduction in line current to less than 1 mA,
and has been mapped onto a reduced battery information element. This should be
allocated to a pulse type and should be designated uninterruptable. As shown in the
example, the acknowledgement-request option has been used.
Notes on case C: An earth-calling PBX
Subscriber A calling and subscriber A clearing.
NOTE 1: It has been assumed that only one digit is sent for this example.
NOTE 2: The seize acknowledgement is handled autonomously as there is not enough time for
the acknowledgement to be sent from the exchange.
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
be the state to which the line defaults after the pulse has been sent.

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Notes on case D: An earth-calling PBX
Subscriber B called and subsequently cleared.
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
line should remain at reverse polarity in-between the bursts.
NOTE 2: It is assumed that the ringing is stopped by the telephone being taken off hook and that
no specific message is required from the exchange.
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
be the state to which the line defaults after the pulse has been sent.
5.1.1 Case A: Subscriber A calling and subscriber A clearing
                                  nat. PSTN
     user port     V5 AN side     V5 LE side     protocol
  idle    |         |AN1        |LE1        |
       |  FE-sub_seiz  |   ESTABLISH  | FE-establish_ind |
 off hook  |—————————————————>|—————————————————>|—————————————————>|
       |(off hook (loop  | Ss = off hook  |   (off hook)  |
       |     closed))|AN2        |LE3        |
       |         |  ESTABLISH ACK | FE-establish_ack |
       |         |<—————————————————|<—————————————————|
       |         |AN5        |LE4        |
       |         |   dial tone  |         |
  dial tone |<·················|··················|··················|
       |         |         |         |
       | FE-line_signal  |   SIGNAL    | FE-line_sign_ind |
  digit 1  |—————————————————>|—————————————————>|—————————————————>|
       | (line state   |  Ds = digit   | (digit signal) |
       | signalling)   |         |         |
       |         |         |         |
       |         |  ring tone   |         |
       |<·················|··················|··················|
       |         |         |         |
  speech   |         |  speech phase  |         |
       |<·················|··················|·················>|
       |         |         |         |
       | FE-line_signal |   SIGNAL    | FE-line_sign_ind |
  on hook  |—————————————————>|—————————————————>|—————————————————>|
       |(on hook (loop  |  Ss= on hook  |  (on hook)   |
       |     open)) |         |         |
       |         |         |         |
       | FE-line_signal |   SIGNAL    | FE-line_sign_req |
  exchange  |<—————————————————|<—————————————————|<—————————————————|
  release  | (pulsed reduced |Ps = pulsed reduc.|(pulsed reduced  |
  signal   |  battery)    |   battery, ack.| battery)     |
       |         |   required   |         |
       |         |         |         |
       | FE-line_signal |   SIGNAL    | FE-line_sign_ind |
  idle    |—————————————————>|—————————————————>|—————————————————>|
       | (pulse ack)   |    Pn     | (pulse ack)   |
       |         |         |         |
       |         |  DISCONNECT  | FE-discon_request|
       |         |<—————————————————|<—————————————————|
       |         |         |LE5        |
       |         |         |         |
       |         |  DISCONNECT  | FE-disc_comp_ind |
       |         |—————————————————>|—————————————————>|
       |         |  COMPLETE   |         |
       |         |AN1        |LE1        |
       <—————————————————>
       V5 AN PSTN protocol
       entity
Figure 3

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5.1.2 Case B: Subscriber B called and subsequently cleared
                                  nat. PSTN
     user port     V5 AN side     V5 LE side     protocol
  idle    |         |AN1        |LE1        |
       |  FE-line_signal |   ESTABLISH  | FE-establish_req |
 ringing   |<—————————————————|<—————————————————|<—————————————————|
       | (cadenced ring) |    Cr    | (cadenced ring) |
       |         |         |LE2        |
       |         | ESTABLISH ACK  | FE-establ_ack_ind|
       |         |—————————————————>|—————————————————>|
       |         |AN5        |LE4        |
       |         |         |         |
       |  FE-line_signal |   SIGNAL   | FE-line_sign_ind |
 off hook  |—————————————————>|—————————————————>|—————————————————>|
       |(off hook (loop  |  Ss = off hook |   (off hook)  |
       |     closed))|         |         |
       |         |         |         |
       |         |  speech phase  |         |
 speech   |<·················|··················|·················>|
       |         |         |         |
       | FE-line_signal |   SIGNAL    | FE-line_sign_req |
 end of call |<—————————————————|<—————————————————|<—————————————————|
 signal   | (pulsed reduced |Ps = pulsed reduc.|(pulsed reduced  |
       |  battery)    |   battery, ack.| battery)     |
       |         |   required   |         |
       |         |         |         |
       | FE-line_signal |   SIGNAL    | FE-line_sign_ind |
       |—————————————————>|—————————————————>|—————————————————>|
       | (pulse ack)   |    Pn     | (pulse ack)   |
       |         |         |         |
       | FE-line_signal |   SIGNAL    | FE-line_sign_req |
 exchange  |<—————————————————|<—————————————————|<—————————————————|
 release   | (pulsed reduced |Ps = pulsed reduc.|(pulsed reduced  |
 signal   |  battery)    |   battery, ack.| battery)     |
       |         |   required   |         |
       |         |         |         |
       | FE-line_signal |   SIGNAL    | FE-line_sign_ind |
       |—————————————————>|—————————————————>|—————————————————>|
       | (pulse ack)   |    Pn     | (pulse ack)   |
       |         |         |         |
       |         |         |         |
       | FE-line_signal |   SIGNAL    | FE-line_sign_ind |
  on hook  |—————————————————>|—————————————————>|—————————————————>|
       |(on hook (loop  |  Ss= on hook  |  (on hook)   |
  idle    |     open)) |         |         |
       |         |         |         |
       |         |  DISCONNECT  | FE-discon_request|
       |         |<—————————————————|<—————————————————|
       |         |         |LE5        |
       |         |         |         |
       |         |  DISCONNECT  | FE-disc_comp_ind |
       |         |—————————————————>|—————————————————>|
       |         |  COMPLETE   |         |
       |         |AN1        |LE1        |
       |         |         |         |
       |         |         |         |
       <—————————————————>
       V5 AN PSTN protocol
       entity
Figure 4

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5.1.3 Case C: Subscriber A calling and subscriber A clearing for an earth-calling PBX
                                  nat. PSTN
     user port     V5 AN side     V5 LE side   protocol (PBX)
  idle    |         |AN1        |LE1        |
       |  FE-sub_seiz  |  ESTABLISH   | FE-establish_ind |
  seize   |—————————————————>|—————————————————>|—————————————————>|
  initiated |(B-wire connected |Ss = B-wire conn. |(B-wire connected |
       |  to earth)   |    to earth  |  to earth)   |
       |         |AN2        |LE3        |
       |         |         |         |
  seize ack | FE-line_signal |         |         |
 (autonomous)|<—————————————————|         |         |
       | (A-wire to    | ESTABLISH ACK  | FE-establish_ack |
       |  battery)   |<—————————————————|<—————————————————|
       |         |AN5        |LE4        |
       |         |         |         |
       |  FE-line_signal |   SIGNAL   | FE-line_sign_ind |
  seize   |—————————————————>|—————————————————>|—————————————————>|
  complete  |(off hook (loop  |  Ss = off hook |   (off hook)  |
       |     closed))|         |         |
       |         |  dial tone   |         |
  dial tone |<·················|··················|··················|
       |         |         |         |
       |  FE-line_signal |   SIGNAL   | FE-line_sign_ind |
  digit 1  |—————————————————>|—————————————————>|—————————————————>|
       | (digit signal) |  Ds = digit  |  (digit signal) |
       |         |         |         |
       |         |  ring tone   |         |
  ring tone |<·················|··················|··················|
       |         |         |         |
       | FE-line_signal |   SIGNAL    | FE-line_sign_req |
  called sub |<—————————————————|<—————————————————|<—————————————————|
  answer   | (reverse battery)|Ss = reverse polar|(reverse battery) |
       |         |         |         |
       |         | speech phase  |         |
  speech   |<·················|··················|·················>|
       |         |         |         |
       |  FE-line_signal |   SIGNAL   | FE-line_sign_ind |
  release  |—————————————————>|—————————————————>|—————————————————>|
       |(on hook (loop  | Ss = on hook  |  (on hook)   |
       |     open)) |         |         |
       |         |         |         |
       | FE-line_signal |   SIGNAL    | FE-line_sign_req |
  release ack|<—————————————————|<—————————————————|<—————————————————|
       | (normal battery) |Ss = normal polar.| (normal battery) |
       |         |         |         |
       |         |         |         |
       | FE-line_signal |   SIGNAL    | FE-line_sign_req |
  release ack|<—————————————————|<—————————————————|<—————————————————|
       | (normal battery) |Ss = normal polar.| (normal battery) |
       |         |         |         |
       | FE-line_signal |   SIGNAL    | FE-line_sign_req |
       |<—————————————————|<—————————————————|<—————————————————|
       | (pulsed no batt.)| Ps = pulsed no |(pulsed no batt.) |
       |         |    battery  |         |
       |         |         |         |
       | FE-line_signal |  DISCONNECT  | FE-discon_request|
  idle    |<—————————————————|<—————————————————|<—————————————————|
       |(A-wire disconnec.|Ss = A-wire discon| (A-wire disconn. |
       |  from earth)  |   from earth  |  from earth)  |
       |         |         |         |
       |         |         |LE5        |
       |         |         |         |
       |         |  DISCONNECT  | FE-disc_comp_ind |
       |         |—————————————————>|—————————————————>|
       |         |  COMPLETE   |         |
       |         |AN1        |LE1        |
       |         |         |         |
       |         |         |         |
       <—————————————————>
       V5 AN PSTN protocol

...