SIST EN 300 745-1 V1.2.4:2005

• Abstract:

  Update references from ETS 300 102-1 and associated I-ETSs to ETS 300 403.

• Status: Published
• Publication Date: 31-Mar-2005
• ICS: 33.080 - Integrated Services Digital Network (ISDN)
• Technical Committee: SPN - Services and Protocols for Networks
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Apr-2005
• Due Date: 01-Apr-2005
• Completion Date: 01-Apr-2005
• Ref Project: ETSI EN 300 745-1 V1.2.4 (1998-06) - Integrated Services Digital Network (ISDN); Message Waiting Indication (MWI) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 1: Protocol specification

SIST EN 300 745-1 V1.2.4:2005 is the Slovenian adoption of EN 300 745-1 Version 1.2.4, issued by SIST, for the Integrated Services Digital Network (ISDN) Message Waiting Indication (MWI) supplementary service. It specifies the Digital Subscriber Signalling System No. one (DSS1) stage-3 protocol, meaning the signalling procedures and switching functions used to activate, deactivate, and invoke MWI for a receiving user.

What does SIST EN 300 745-1 V1.2.4:2005 specify?

SIST EN 300 745-1 V1.2.4:2005 specifies the protocol specification for the MWI supplementary service over ISDN at the T reference point or coincident S and T reference point, including operation through an intermediate private ISDN. It also gives interworking rules for private ISDNs and the coding used for the DSS1 operations and errors.

The document is organized into clauses for scope, normative references, definitions, abbreviations, description, operational requirements, coding requirements, state definitions, signalling procedures, private-ISDN interworking, network interaction, interaction with other supplementary services, timer values, and SDL diagrams. It also includes three informative annexes.

Annex	What it covers
Annex A	Signalling flows for the MWI supplementary service
Annex B	Assignment of object identifier values
Annex C	Changes with respect to the previous ETS 300 745-1

The scope excludes charging principles and the additional protocol requirements for delivery via a non-ISDN telecommunication network. It says the service is independent of a call and is typically used between a mailbox service provider and a receiving user.

What are the key requirements of SIST EN 300 745-1 V1.2.4:2005?

SIST EN 300 745-1 V1.2.4:2005 sets out how the network, the controlling user, and the receiving user exchange MWI requests and indications. The practical result is that implementers must support the right parameters, states, timers, and message flows for activation, deactivation, and notification.

Service provision, access and subscription

Clause 6 says the MWI supplementary service shall be provided to both the controlling user and the receiving user after prior arrangements with the service provider, and it may be withdrawn on request or for administrative reasons. In practice, this means the service is subscription-based, not automatic.

Clause 6 also makes the service available on a basic access or primary rate access, and it can be provisioned on an access or ISDN number basis. The receiving user may have a subscription option to register controlling user ISDN numbers, so operators can restrict which numbers may activate or deactivate the service.

The subscription options include deferred mode, immediate mode, and combined mode. Clause 6 also allows the controlling user to override the invocation mode if the network supports that option.

Coding and signalling

Clause 7 requires the operations and errors to be encoded using ASN.1 with the OPERATION and ERROR macros, and all components - invoke, return result, return error, and reject - shall be carried in a Facility information element. In practice, terminals and switches must support the same DSS1 facility coding to interoperate.

Clause 9 defines the normal and exceptional procedures at the coincident S and T reference point. The controlling user sends MWIActivate or MWIDeactivate with parameters such as receivingUserNr, basicService, controllingUserNr, numberOfMessages, controllingUserProvidedNr, time, messageId, and mode, and the network returns a result or an error.

Clause 9.5 defines how the receiving user is informed. In immediate mode, the network sends MWIIndicate after activation or deactivation; in deferred mode, MWIIndicate is sent after outgoing call attempts; and in combined mode both apply. That matters because the receiving user can see a message-waiting indication either immediately or at call attempt time, depending on subscription.

State handling, private ISDNs and timers

Clause 8 defines the service states. The controlling user can be Idle, Activation Requested, or Deactivation Requested, while the network can be Idle, MWI Active, Activation Requested, or Deactivation Requested. These states give implementers a common model for handling repeated requests and ongoing transactions.

Clause 10 covers cases where one side of the service is in a private ISDN. The public and private networks relay the same activation and deactivation operations, and they use timers T-ACTIVATE and T-DEACTIVATE with a duration of 10 seconds. In practice, if no response arrives before timer expiry, the request result is undetermined and the signalling connection is cleared.

Clause 11 says interaction with other networks has no impact, and clause 12 says interaction with other supplementary services follows EN 300 195-1. That tells implementers where to look when MWI is combined with other supplementary service behaviour.

What terms does SIST EN 300 745-1 V1.2.4:2005 define?

SIST EN 300 745-1 V1.2.4:2005 defines the main service actors and the DSS1 message types used by the protocol. These terms are central to understanding who requests the service, who receives the indication, and how the network signals it.

• Integrated Services Digital Network (ISDN) - the network environment for the service, as defined by ITU-T Recommendation I.112.
• Digital Subscriber Signalling System No. one (DSS1) - the signalling protocol used at the user-network interface.
• Message Waiting Indication (MWI) - the supplementary service that tells the receiving user that at least one message is waiting.
• controlling user - the user that activates and deactivates the message waiting indication, typically a mailbox service.
• receiving user - the user that receives the message waiting indication.
• invoke component - the DSS1 operation request carried in the Facility information element.
• public network - the DSS1 protocol entity at the network side of the user-network interface at the T reference point.
• private network - the DSS1 protocol entity at the user side of the user-network interface at the T reference point.

Who uses SIST EN 300 745-1 V1.2.4:2005?

SIST EN 300 745-1 V1.2.4:2005 is used by public ISDN operators, private ISDN operators, mailbox service providers, and equipment makers that support DSS1 signalling for MWI. It is also relevant to integration and conformance teams that need to verify activation, deactivation, invocation, and error handling.

A buyer or quality manager would use it to check whether a switch, gateway, or terminal supports the required service model and the right interworking points. Test teams would use it together with the companion test standards to build conformance cases for user-side and network-side behaviour.

What changed in SIST EN 300 745-1 V1.2.4:2005 from the previous edition?

Annex C states three changes relative to the previous ETS 300 745-1: conversion to EN layout, replacement of references to ETS 300 102 with EN 300 403, and substitution of non-specific references to basic standards where the intention is to refer to the latest version. The foreword also says the present version updates the references to the basic call specifications.

Which standards are used with SIST EN 300 745-1 V1.2.4:2005?

SIST EN 300 745-1 V1.2.4:2005 relies on several referenced standards for numbering, vocabulary, protocol structure, encoding, and test support. These give the background rules that MWI builds on.

Standard	What it contributes
EN 300 195-1	Supplementary service interactions, used in clause 12
EN 300 196-1	Generic functional protocol for supplementary services, including Facility information element coding and invoke/result/error procedures
ETS 300 650	Stage 1 description of the MWI supplementary service
ITU-T E.164	ISDN numbering plan used for ISDN numbers
ITU-T I.112	ISDN vocabulary and definitions
CCITT I.130	Three-stage method for describing telecommunication services
ITU-T I.210	Principles of telecommunication services and service description
ITU-T I.411	ISDN user-network reference configurations
CCITT Q.9	Switching and signalling vocabulary, including access terms
CCITT X.208	ASN.1 notation used for the operations and errors
CCITT X.219	Remote Operations model and macros used in clause 7
ITU-T Z.100	SDL notation used for the dynamic description

The foreword also identifies Parts 2 to 6 of the same standard family: PICS proforma, TSS&TP for the user, ATS and PIXIT for the user, TSS&TP for the network, and ATS and PIXIT for the network.

What does the SIST EN 300 745-1 V1.2.4:2005 document contain?

SIST EN 300 745-1 V1.2.4:2005 contains tables for network options, subscription options, states, operations and errors, and object identifier values. It also contains the ASN.1 definitions for MWIActivate, MWIDeactivate, and MWIIndicate, plus the related error values and identifiers.

The document includes SDL diagrams in figures 1 to 8 for controlling user and receiving user behaviour on both the user side and the network side, at the coincident S and T reference point and at the T reference point. Annex A adds signalling flow figures for deferred, immediate, private-network, and mixed cases, which is useful for implementation and test-case design.

SLOVENSKI STANDARD
01-april-2005
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Integrated Services Digital Network (ISDN); Message Waiting Indication (MWI)
supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol;
Part 1: Protocol specification
Ta slovenski standard je istoveten z: EN 300 745-1 Version 1.2.4
ICS:
33.080 Digitalno omrežje z Integrated Services Digital
integriranimi storitvami Network (ISDN)
(ISDN)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 300 745-1 V1.2.4 (1998-06)
European Standard (Telecommunications series)
Integrated Services Digital Network (ISDN);
Message Waiting Indication (MWI) supplementary service;
Digital Subscriber Signalling System No. one (DSS1) protocol;
Part 1: Protocol specification

2 EN 300 745-1 V1.2.4 (1998-06)
Reference
REN/SPS-05145-W-1 (6wc90iqo.PDF)
Keywords
ISDN, MWI, DSS1, supplementary service
ETSI
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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 1998.
All rights reserved.
ETSI
3 EN 300 745-1 V1.2.4 (1998-06)
Contents
Intellectual Property Rights.5
Foreword .5
1 Scope.7
2 Normative references .7
3 Definitions.8
4 Abbreviations.9
5 Description.9
6 Operational requirements.9
6.1 Provision and withdrawal. 9
6.2 Requirements on the receiving user's network side. 10
6.3 Requirements on the controlling user's network side . 10
7 Coding requirements .10
7.1 Coding of the facility information element components . 10
8 State definitions .12
9 Signalling procedures at the coincident S and T reference point .13
9.1 Activation at the controlling user's interface. 13
9.1.1 Normal operation . 13
9.1.2 Exceptional procedures . 13
9.2 Deactivation at the controlling user's interface . 14
9.2.1 Normal operation . 14
9.2.2 Exceptional procedures . 14
9.3 Activation at the receiving user's interface. 15
9.3.1 Normal operation . 15
9.3.2 Exceptional procedures . 15
9.4 Deactivation at the receiving user's interface. 16
9.4.1 Normal operation . 16
9.4.2 Exceptional procedures . 16
9.5 Invocation of the MWI to the receiving user . 16
9.5.1 Normal operation . 16
9.5.1.1 Invocation in the immediate mode. 16
9.5.1.2 Invocation in the deferred mode . 17
9.5.1.3 Invocation in the combined mode. 17
9.5.2 Exceptional procedures . 17
10 Procedures for interworking with private ISDNs .18
10.1 Activation of the message waiting indication where the controlling user resides in a private network. 18
10.1.1 Normal procedures. 18
10.1.2 Exceptional procedures . 18
10.2 Deactivation of the message waiting indication where the controlling user resides in a private network . 19
10.2.1 Normal procedures. 19
10.2.2 Exceptional procedures . 20
10.3 Activation of the message waiting indication where the receiving user resides in a private ISDN. 20
10.3.1 Normal operation . 20
10.3.2 Exceptional procedures . 21
10.4 Deactivation of the message waiting indication where the receiving user resides in a private ISDN . 22
10.4.1 Normal procedures. 22
10.4.2 Exceptional procedures . 22
ETSI
4 EN 300 745-1 V1.2.4 (1998-06)
11 Interaction with other networks .23
12 Interaction with other supplementary services.23
13 Parameter values (timers).23
14 Dynamic description (SDL diagrams) .23
14.1 Controlling user . 24
14.1.1 Controlling user - user side . 24
14.1.1.1 Controlling user - user side (coincident S and T reference point) . 24
14.1.1.2 Controlling user - user side (T reference point). 26
14.1.2 Controlling user - network side . 28
14.1.2.1 Controlling user - network side (coincident S and T reference point) . 28
14.1.2.2 Controlling user - network side (T reference point). 30
14.2 Receiving user. 32
14.2.1 Receiving user - user side. 32
14.2.1.1 Receiving user - user side (coincident S and T reference point). 32
14.2.1.2 Receiving user - user side (T reference point) . 33
14.2.2 Receiving user - network side . 35
14.2.2.1 Receiving user - network side (coincident S and T reference point) . 35
14.2.2.2 Receiving user - network side (T reference point). 37
Annex A (informative): Signalling flows.39
Annex B (informative): Assignment of object identifier values.41
Annex C (informative): Changes with respect to the previous ETS 300 745-1 .42
History.43
ETSI
5 EN 300 745-1 V1.2.4 (1998-06)
Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect
of ETSI standards", which is available free of charge from the ETSI Secretariat. Latest updates are available on the
ETSI Web server (http://www.etsi.fr/ipr or http://www.etsi.org/ipr).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in SR 000 314 (or the updates on the ETSI Web server)
which are, or may be, or may become, essential to the present document.
Foreword
This European Standard (Telecommunications series) has been produced by ETSI Technical Committee Signalling
Protocols and Switching (SPS).
The present document is part 1 of a multi-part standard covering the Digital Subscriber Signalling System No. one
(DSS1) protocol specification for the Integrated Services Digital Network (ISDN) Message Waiting Indication (MWI)
supplementary service, as described below:
Part 1: "Protocol specification";
Part 2: "Protocol Implementation Conformance Statement (PICS) proforma specification";
Part 3: "Test Suite Structure and Test Purposes (TSS&TP) specification for the user";
Part 4: "Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT)
proforma specification for the user";
Part 5: "Test Suite Structure and Test Purposes (TSS&TP) specification for the network";
Part 6: "Abstract Test Suite (ATS) and partial Protocol Implementation eXtra Information for Testing (PIXIT)
proforma specification for the network".
In accordance with CCITT Recommendation I.130, the following three level structure is used to describe the
supplementary telecommunication services as provided by European public telecommunications operators under the
pan-European ISDN:
- Stage 1: is an overall service description, from the user's standpoint;
- Stage 2: identifies the functional capabilities and information flows needed to support the service described in
stage 1; and
- Stage 3: defines the signalling system protocols and switching functions needed to implement the service
described in stage 1.
The present document details the stage 3 aspects (signalling system protocols and switching functions) needed to
support the MWI supplementary service. The stage 1 aspects are detailed in ETS 300 650. The stage 2 aspects of the
MWI supplementary service have not been specified.
The present version updates the references to the basic call specifications.
ETSI
6 EN 300 745-1 V1.2.4 (1998-06)
National transposition dates
Date of adoption of this EN: 19 June 1998
Date of latest announcement of this EN (doa): 30 September 1998
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 31 March 1999
Date of withdrawal of any conflicting National Standard (dow): 31 March 1999
ETSI
7 EN 300 745-1 V1.2.4 (1998-06)
1 Scope
This first part of EN 300 745 specifies the stage three of the Message Waiting Indication (MWI) supplementary service
for the pan-European Integrated Services Digital Network (ISDN) as provided by European public telecommunications
operators at the T reference point or coincident S and T reference point (as defined in ITU-T Recommendation
I.411 [7]) by means of the Digital Subscriber Signalling System No. one (DSS1) protocol. Stage three identifies the
protocol procedures and switching functions needed to support a telecommunication service (see CCITT
Recommendation I.130 [5]).
In addition, the present document specifies the protocol requirements at the T reference point where the service is
provided to the user via an intermediate private ISDN.
The present document does not specify the additional protocol requirements where the service is provided to the user via
a telecommunication network that is not an ISDN but it does include interworking requirements of other networks with
the public ISDN.
The MWI supplementary service is provided independently of a call and is therefore applicable to a number of
telecommunication services.
Charging principles are outside the scope of the present document.
The MWI supplementary service enables the network, upon request of a controlling user to indicate to the receiving
user, that there is at least one message waiting.
NOTE: The MWI supplementary service is typically used between a mailbox service provider (controlling user)
and a user (receiving user) of the mailbox service provided .
Further parts of the present document specify the method of testing required to identify conformance to the present
document.
The present document is applicable to equipment supporting the MWI supplementary service, to be attached at either
side of a T reference point or coincident S and T reference point when used as an access to the public ISDN.
2 Normative references
References may be made to:
a) specific versions of publications (identified by date of publication, edition number, version number, etc.), in
which case, subsequent revisions to the referenced document do not apply; or
b) all versions up to and including the identified version (identified by "up to and including" before the version
identity); or
c) all versions subsequent to and including the identified version (identified by "onwards" following the version
identity); or
d) publications without mention of a specific version, in which case the latest version applies.
A non-specific reference to an ETS shall also be taken to refer to later versions published as an EN with the same
number.
[1] EN 300 195-1: "Integrated Services Digital Network (ISDN); Supplementary service interactions;
Digital Subscriber Signalling System No. one (DSS1) protocol; Part 1: Protocol specification".
[2] EN 300 196-1: "Integrated Services Digital Network (ISDN); Generic functional protocol for the
support of supplementary services; Digital Subscriber Signalling System No. one (DSS1) protocol;
Part 1: Protocol specification".
[3] ITU-T Recommendation E.164: "Numbering plan for the ISDN era".
[4] ITU-T Recommendation I.112: "Vocabulary of terms for ISDNs".
ETSI
8 EN 300 745-1 V1.2.4 (1998-06)
[5] CCITT Recommendation I.130 (1988): "Method for the characterization of telecommunication
services supported by an ISDN and network capabilities of an ISDN".
[6] ITU-T Recommendation I.210: "Principles of telecommunication services supported by an ISDN
and the means to describe them".
[7] ITU-T Recommendation I.411 (1993): "ISDN user-network interfaces - Reference configurations".
[8] CCITT Recommendation Q.9 (1988): "Vocabulary of switching and signalling terms".
[9] CCITT Recommendation X.208 (1988): "Specification of Abstract Syntax Notation One
(ASN.1)".
[10] CCITT Recommendation X.219 (1988): "Remote Operations: Model, notation and service
definition".
[11] ITU-T Recommendation Z.100 (1993): "Specification and Description Language (SDL)".
3 Definitions
For the purposes of the present document, the following definitions apply:
basic access: See CCITT Recommendation Q.9 [8], definition 1551.
basic call procedures: The procedures by which a call (as an instance of a telecommunications service) is established
and terminated.
controlling user: The user that activates and deactivates the message waiting indication.
NOTE 1: The controlling user is likely to be a voice mail box.
Integrated Services Digital Network (ISDN): See ITU-T Recommendation I.112 [4], definition 308.
ISDN number: A number conforming to the numbering plan and structure specified in CCITT Recommendation
E.164 [3].
invoke component: See EN 300 196-1 [2], subclause 8.2.2.1. Where reference is made to a "xxxx" invoke component,
an invoke component is meant with its operation value set to the value of the operation "xxxx".
mail box: A system, inside or outside the public network infrastructure, capable to handle mail.
NOTE 2: The definition of the mail box service is outside the scope of the present document.
network: The DSS1 protocol entity at the network side of the user-network interface.
public network: The DSS1 protocol entity at the network side of the user-network interface at the T reference point.
primary rate access: See CCITT Recommendation Q.9 [8], definition 1552.
private network: The DSS1 protocol entity at the user side of the user-network interface at the T reference point.
receiving user: The user that receives the message waiting indication.
reject component: See EN 300 196-1 [2], subclause 8.2.2.4.
return error component: See EN 300 196-1 [2], subclause 8.2.2.3. Where reference is made to a "xxxx" return error
component, a return error component is meant which is related to a "xxxx" invoke component.
return result component: See EN 300 196-1 [2], subclause 8.2.2.2. Where reference is made to a "xxxx" return result
component, a return result component is meant which is related to a "xxxx" invoke component.
service; telecommunication service: See ITU-T Recommendation I.112 [4], definition 201.
supplementary service: See ITU-T Recommendation I.210 [6], subclause 2.4.
ETSI
9 EN 300 745-1 V1.2.4 (1998-06)
user: The DSS1 protocol entity at the user side of the user-network interface.
4 Abbreviations
For the purposes of the present document, the following abbreviations apply:
ASN.1 Abstract Syntax Notation One
DSS1 Digital Subscriber Signalling System No. one
ISDN Integrated Services Digital Network
MWI Message Waiting Indication
SDL Specification and Description Language
5 Description
The MWI supplementary service shall be available to users who are connected to the network via a basic access or
primary rate access.
The MWI supplementary service enables the network, upon the request of a controlling user to indicate to the receiving
user, that there is at least one message waiting. The indication is delivered to the receiving user:
- when the MWI supplementary service is activated for a certain basic service and the receiving user makes an
outgoing call attempt; and/or
- as soon as the MWI supplementary service has been activated or deactivated.
NOTE: Having received this indication, the receiving user can subsequently access the mail box, to have the mail
delivered. The means by which the receiving user accesses and manages the mail box are outside the
scope of the present document.
The controlling user can activate and deactivate the message waiting indication when appropriate.
6 Operational requirements
6.1 Provision and withdrawal
The MWI supplementary service shall be provided to the controlling user after prior arrangements with the service
provider. The MWI supplementary service shall be withdrawn at the controlling user's request, or for administrative
reasons.
The MWI supplementary service shall be provided to the receiving user after prior arrangements with the service
provider. The MWI supplementary service shall be withdrawn at the receiving user's request, or for administrative
reasons. As a network option, the receiving user can have a subscription option to register the controlling user numbers
that can activate and deactivate the MWI supplementary service.
Table 1: Network options
Network options Values
Support of subscription option for registration of the ISDN - yes
number(s) of the controlling user(s) -no
Provide additional information during deferred invocation - yes
-no
Maximum number of controlling users' ISDN numbers any integer value
registered by the network
Maximum number of active instances per receiving user any integer value
The maximum number of ISDN numbers that can be registered for a receiving user is a network option.
ETSI
10 EN 300 745-1 V1.2.4 (1998-06)
Provision of the MWI supplementary service shall be possible on an access or ISDN number basis.
In addition, the subscription options shown in table 2 shall be made available to the receiving user.
Table 2: Subscription options
Subscription options Values
Invocation mode a) deferred mode: invocation when the supplementary
service is activated and the receiving user makes
an outgoing call;
b) immediate mode: invocation as soon as the
supplementary service has been activated or
deactivated;
c) combined mode: in this case both the deferred and
immediate mode apply.
Override of invocation mode by controlling user allowed - yes
-no
Registration of the ISDN number(s) of the controlling - yes
user(s) -no
6.2 Requirements on the receiving user's network side
The network shall register whether the procedures of clause 9 or clause 10 of the present document shall apply.
6.3 Requirements on the controlling user's network side
The network shall register whether the procedures of clause 9 or clause 10 of the present document shall apply.
7 Coding requirements
7.1 Coding of the facility information element components
Table 3 shows the definitions of the operations and errors required for the MWI supplementary service using ASN.1 as
specified in CCITT Recommendation X.208 [9] and using the OPERATION and ERROR macros as defined in figure 4
of CCITT Recommendation X.219 [10].
The formal definition of the component types to encode these operations and errors is provided in clause D.1 of
EN 300 196-1 [2].
The inclusion of components in Facility information elements is defined in EN 300 196-1 [2], subclause 11.2.2.1.
All components (invoke, return result, return error and reject) shall be included within a Facility information element.
This Facility information element may be included in any appropriate message as specified in EN 300 196-1 [2],
subclause 8.3.1.1, unless a more restrictive specification is given in clause 9 of the present document.
ETSI
11 EN 300 745-1 V1.2.4 (1998-06)
Table 3: Definition of operations and errors for the MWI supplementary service
MWI-Operations-and-Errors {ccitt identified-organization etsi(0) 745 operations-and-errors(1)}
DEFINITIONS EXPLICIT TAGS ::=
BEGIN
EXPORTS MWIActivate,
MWIDeactivate,
MWIIndicate,
InvalidReceivingUserNr,
ReceivingUserNotSubscribed,
ControllingUserNotRegistered,
MaxNumOfControllingUsersReached,
MaxNumOfActiveInstancesReached
;
IMPORTS OPERATION,
ERROR
FROM Remote-Operation-Notation
{joint-iso-ccitt remote-operations(4) notation(0)}
notSubscribed,
supplementaryServiceInteractionNotAllowed,
resourceUnavailable,
invalidServedUserNr
FROM General-Errors
{ccitt identified-organization etsi(0) 196 general-errors(2)}
BasicService
From Basic-Service-Elements
{ccitt identified-organization etsi(0) 196 basic-service-elements(8)}
PartyNumber
FROM Addressing-Data-Element
{ccitt identified-organization etsi(0) 196 addressing-data-elements(6)}
;
MWIActivate ::= OPERATION
ARGUMENT SEQUENCE {
receivingUserNr PartyNumber,
basicService BasicService,
controllingUserNr [1] PartyNumber OPTIONAL,
numberOfMessages [2] MessageCounter OPTIONAL,
controllingUserProvidedNr [3] PartyNumber OPTIONAL,
time [4] GeneralizedTime OPTIONAL,
messageId [5] MessageID OPTIONAL,
mode [6] InvocationMode OPTIONAL}
RESULT
ERRORS {
notSubscribed,
supplementaryServiceInteractionNotAllowed,
resourceUnavailable,
invalidReceivingUserNr,
invalidServedUserNr,
receivingUserNotSubscribed,
controllingUserNotRegistered,
indicationNotDelivered,
maxNumOfControllingUsersReached,
maxNumOfActiveInstancesReached }
-- End of MWIActivate operation definition
MWIDeactivate ::= OPERATION
ARGUMENT SEQUENCE {
receivingUserNr PartyNumber,
basicService BasicService,
controllingUserNr PartyNumber OPTIONAL,
mode InvocationMode OPTIONAL }
RESULT
ERRORS {
notSubscribed,
supplementaryServiceInteractionNotAllowed,
resourceUnavailable,
invalidReceivingUserNr,
invalidServedUserNr,
receivingUserNotSubscribed,
controllingUserNotRegistered,
indicationNotDelivered }
-- End of MWIDeactivate operation definition
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12 EN 300 745-1 V1.2.4 (1998-06)
Table 3 (concluded): Definition of operations and errors for the MWI supplementary service
MWIIndicate ::= OPERATION
ARGUMENT SEQUENCE {
controllingUserNr [1] PartyNumber OPTIONAL,
basicService [2] BasicService OPTIONAL,
numberOfMessages [3] MessageCounter OPTIONAL,
controllingUserProvidedNr [4] PartyNumber OPTIONAL,
time [5] GeneralizedTime OPTIONAL,
messageId [6] MessageID OPTIONAL}
-- End of MWIIndicate operation definition
InvalidReceivingUserNr ::= ERROR
ReceivingUserNotSubscribed ::= ERROR
ControllingUserNotRegistered ::= ERROR
IndicationNotDelivered ::= ERROR
MaxNumOfControllingUsersReached ::= ERROR
MaxNumOfActiveInstancesReached ::= ERROR
MessageCounter ::= INTEGER (0.65535)
GeneralizedTime ::= [UNIVERSAL 24] IMPLICIT VisibleString
MessageID ::= SEQUENCE {
messageRef MessageRef,
status MessageStatus}
MessageRef ::= INTEGER (0.65535)
MessageStatus ::= ENUMERATED (
addedMessage (0),
removedMessage (1)}
InvocationMode ::= ENUMERATED (
deferred (0),
immediate (1),
combined (2))
mWIOID OBJECT IDENTIFIER ::= {ccitt identified-organization etsi(0) 745
operations-and-errors(1)}
mWIActivate MWIActivate ::= globalValue {mWIOID 1}
mWIDeactivate MWIDeactivate ::= globalValue {mWIOID 2}
mWIIndicate MWIIndicate ::= globalValue {mWIOID 3}
invalidReceivingUserNr InvalidReceivingUserNr ::= globalValue {mWIOID 10}
receivingUserNotSubscribed ReceivingUserNotSubscribed ::= globalValue {mWIOID 11}
controllingUserNotRegistered ControllingUserNotRegistered ::= globalValue {mWIOID 12}
indicationNotDelivered IndicationNotDelivered ::= globalValue {mWIOID 13}
maxNumOfControllingUsersReached MaxNumOfControllingUsersReached ::= globalValue {mWIOID 14}
maxNumOfActiveInstancesReached MaxNumOfActiveInstancesReached ::= globalValue {mWIOID 15}
END -- MWI-Operations-and-Errors
8 State definitions
Table 4 defines the states for the MWI supplementary service.
Table 4: States for MWI supplementary service
Controlling user states
Idle The MWI supplementary service is idle
Activation Requested The user has requested activation and is waiting for a response
Deactivation Requested The user has requested deactivation and is waiting for a response
Network states
Idle The MWI supplementary service is idle
MWI Active (note 1) The MWI supplementary service has been activated
Activation Requested (note 2) The network has received activation request
Deactivation Requested (note 2) The network has received deactivation request
NOTE 1: Only applicable for the receiving user's network when the procedures of clause 9 apply.
NOTE 2: Applicable for the controlling user's network and for the receiving user's network when the procedures of
clause 10 apply.
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13 EN 300 745-1 V1.2.4 (1998-06)
9 Signalling procedures at the coincident S and
T reference point
9.1 Activation at the controlling user's interface
9.1.1 Normal operation
To activate the MWI supplementary service, the controlling user shall send a MWIActivate invoke component to the
network using the procedure described in subclause 10.2.2.1 of EN 300 196-1 [2].
The controlling user shall indicate:
- in the "basicService" parameter, the basic service to which the activation of the MWI supplementary service
activation applies;
- in the "receivingUserNr" parameter, the ISDN number of the receiving user for which the activation applies; and
- optionally, in the "numberOfMessages" parameter the number of messages present;
- optionally, in the "controllingUserProvidedNr" parameter the ISDN number provided by the controlling user e.g.
the ISDN number of the originating user of the indicated message;
- optionally, in the "time" parameter the date and time provided by the controlling user of the indicated message;
- optionally in the "controllingUserNr" parameter, the ISDN number of the controlling user from which the MWI
service activation is requested;
- optionally, in the "messageId" parameter, a reference of the related message and an indication whether the
message is added or removed; and
- optionally, in the "mode" parameter the applicable invocation mode.
On receipt of an MWIActivate invoke component the controlling user's network shall inform the receiving user's
network of the request and wait for a response.
When the controlling user's network is informed of the acceptance of the activation, the controlling user's network shall
send a MWIActivate return result component to the controlling user using the procedures of subclause 10.2.2.1 of
EN 300 196-1 [2].
When the controlling user receives a correctly encoded MWIActivate return result component, then the controlling
user shall accept the provided information and the MWI supplementary service is successfully activated.
9.1.2 Exceptional procedures
If the network is not able to activate the MWI supplementary service, the controlling user's network shall send a
MWIActivate return error component to the controlling user within a Facility information element, using the procedure
in subclause 10.2.2.2 of EN 300 196-1 [2], indicating one of the following error values:
- "notSubscribed", if (for a given ISDN number or for the whole access) the MWI supplementary service has not
been subscribed to by the controlling user;
- "invalidReceivingUserNr", if the ISDN number provided to identify the receiving user is not a valid number;
- "supplementaryServiceInteractionNotAllowed", if the provision of the MWI supplementary service is precluded
by a procedure within EN 300 195-1 [1], clause 5;
- "resourceUnavailable", if the resources required to perform adequately the MWI supplementary service are not
available. This error shall be used to indicate a congestion situation;
- "invalidServedUserNr", if the ISDN number provided to identify the controlling user is not a valid number;
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14 EN 300 745-1 V1.2.4 (1998-06)
- "receivingUserNotSubscribed", if the MWI supplementary service has not been subscribed to by the receiving
user;
- "controllingUserNotRegistered", if the controlling user is not allowed to activate the MWI supplementary service
for the receiving user;
- "indicationNotDelivered", if the controlling user's network has not received a response from the receiving user's
network;
- "maxNumOfControllingUsersReached", if the receiving user's network cannot handle any further controlling
users.
- "maxNumOfActiveInstancesReached", this error value shall be used when the maximum number of activations
for the receiving user has been reached and a further activation has been requested.
On receipt of a MWIActivate return error component, the controlling user shall stop T-ACTIVATE and shall consider
that this attempt to activate the MWI supplementary service has failed.
On expiration of timer T-ACTIVATE and the controlling user not having received any response to the MWIActivate
invoke component, the result of the activation request is undetermined.
If a reject component is received by either the controlling user or the controlling user's network and the invoke identifier
is included, the reject component shall be ignored.
9.2 Deactivation at the controlling user's interface
9.2.1 Normal operation
To deactivate the MWI supplementary service, the controlling user shall send a MWIDeactivate invoke component to
the network using the procedures described in subclause 10.2.3.1 of EN 300 196-1 [2].
The controlling user shall indicate:
- in the "basicService" parameter, the basic service to which the deactivation of the MWI supplementary service
activation applies;
- in the "receivingUserNr" parameter, the ISDN number of the receiving user for which the deactivation applies;
- optionally, in the "controllingUserNr" parameter, the ISDN number of the controlling user from which the MWI
supplementary service deactivation is requested; and
- optionally, in the "mode" parameter the applicable invocation mode.
On receipt of an MWIDeactivate invoke component the controlling user's network shall inform the receiving user's
network of the request and wait for a response.
When the controlling user's network is informed of the acceptance of the deactivation request, the controlling user's
network shall send a MWIDeactivate return result component to the controlling user using the procedures of
subclause 10.2.3.1 of EN 300 196-1 [2].
When the controlling user receives a correctly encoded MWIDeactivate return result component, then the controlling
user shall accept the provided information and the MWI supplementary service is successfully deactivated.
9.2.2 Exceptional procedures
If the network is unable to deactivate the MWI supplementary service, the controlling user's network shall send a
MWIDeactivate return error component to the controlling user within a Facility information element, using the
procedure described in subclause 10.2.3.2 of EN 300 196-1 [2], indicating one of the following error values:
- "notSubscribed", if (for a given ISDN number or for the whole access) the MWI supplementary service has not
been subscribed to by the controlling user;
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15 EN 300 745-1 V1.2.4 (1998-06)
- "invalidReceivingUserNr", if the ISDN number provided to identify the receiving user is not a valid number;
- "supplementaryServiceInteractionNotAllowed", if the provision of the MWI supplementary service is precluded
by a procedure within EN 300 195-1 [1], clause 5;
- "resourceUnavailable", if the resources required to perform adequately the MWI supplementary service are not
available. This error shall be used to indicate a congestion situation;
- "invalidServedUserNr", if the ISDN number provided to identify the controlling user is not a valid number;
- "receivingUserNotSubscribed", if the MWI supplementary service has not been subscribed to by the receiving
user;
- "controllingUserNotRegistered", if the controlling user is not allowed to deactivate the MWI supplementary
service for the receiving user;
- "indicationNotDelivered", if the controlling user's network has not received a response from the receiving user's
network.
On receipt of a MWIDeactivate return error component, the controlling user shall stop T-DEACTIVATE and shall
consider that this attempt to deactivate the MWI supplementary service has failed.
On expiration of timer T-DEACTIVATE and the controlling user not having received any response to the
MWIDeactivate invoke component, the result of the deactivation request is undetermined.
If a reject component is received by either the controlling user or the controlling user's network and the invoke identifier
is included, the reject component shall be ignored.
9.3 Activation at the receiving user's interface
9.3.1 Normal operation
On receipt of an activation request from the controlling user's network, the receiving user's network shall use the
basicService, controllingUserNr and receivingUserNr parameters to decide which instance of the MWI supplementary
service shall be activated.
Furthermore the receiving user's network shall determine the appropriate invocation mode: if the receiving user has not
subscribed to the override mode or the controlling user did not indicate an invocation mode, the resulting invocation
mode is the invocation mode subscribed to by the receiving user. If the receiving user has subscribed to the override
mode and the controlling user did indicate an invocation mode, the resulting invocation mode is the indicated one.
In case the resulting invocation mode is "deferred mode" and the receiving user's network accepts the activation request,
the receiving user's network shall inform the controlling user's network accordingly and activate the indicated instance.
In case the resulting invocation mode is "immediate mode" and the receiving user's network accepts the activation
request, the receiving user's network shall inform the controlling user's network accordingly and invoke the MWI
supplementary service as specified in subclause 9.5.1.
In case the resulting invocation mode is "combined mode" and the receiving user's network accepts the activation
request, the receiving user's network shall inform the controlling user's network accordingly, invoke the MWI
supplementary service as specified in subclause 9.5.1, and activate the indicated instance.
When this instance of the MWI supplementary service is already active, the new activation shall replace the existing
activation.
9.3.2 Exceptional procedures
If the receiving user's network cannot accept the request to activate the MWI supplementary service, the receiving user's
network shall inform the controlling user's network accordingly and provide the reason.
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9.4 Deactivation at the receiving user's interface
9.4.1 Normal operation
On receipt of a deactivation request from the controlling user's network, the receiving user's network shall use the
basicService, controllingUserNr and receivingUserNr parameters to decide which instance of the MWI supplementary
service shall be deactivated.
Furthermore the receiving user's network shall determine the appropriate invocation mode: if the receiving user has not
subscribed to the override mode or the controlling user did not indicate an invocation mode, the resulting invocation
mode is the invocation mode subscribed to by the receiving user. If the receiving user has subscribed to the override
mode and the controlling user did indicate an invocation mode, the resulting invocation mode is the indicated one.
In case the resulting invocation mode is "deferred mode" and the receiving user's network accepts the deactivation
request, the receiving user's network shall inform the controlling user's network accordingly and deactivate the indicate
instance.
In case the resulting invocation mode is "immediate mode" and the receiving user's network accepts the deactivation
request, the receiving user's network shall inform the controlling user's network accordingly and invoke the MWI
supplementary service as specified in subclause 9.5.1.
In case the resulting invocation mode is "combined mode" and the receiving user's network accepts the deactivation
request, the receiving user's network shall inform the controlling user's network accordingly, invoke the MWI
supplementary service as specified in subclause 9.5.1, and deactivate the indicated instance.
9.4.2 Exceptional procedures
If the receiving user's network cannot accept the request to deactivate the MWI supplementary service, the receiving
user's network shall inform the controlling user's network accordingly and provide the reason.
9.5 Invocation of the MWI to the receiving user
9.5.1 Normal operation
As a receiving user's subscription option, three modes of invocation are available:
a) invocation when the MWI supplementary service is activated and the receiving user makes an outgoing call
(deferred invocation mode);
b) invocation immediately after activation or deactivation (immediate invocation mode);
c) a combination of deferred and immediate invocation (combined invocation mode).
9.5.1.1 Invocation in the immediate mode
When the receiving user's network successfully activates an instance of the MWI supplementary service for which the
immediate mode applies, the receiving user's network shall send a MWIIndicate invoke component to the receiving user
in a Facility information element according to the procedures of subclause 8.3.2.4 of EN 300 196-1 [2].
The receiving user's network shall indicate:
- in the "controllingUserNr" par
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