SIST EN 300 958 V7.0.1:2003
(Main)Digital cellular telecommunications system (Phase 2+) (GSM); Explicit Call Transfer (ECT) supplementary service; Stage 3 (GSM 04.91 version 7.0.1 Release 1998)
- Abstract
Upgrade from Phase 2+ to Release 1998
- Status
- Published
- Publication Date
- 30-Nov-2003
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Dec-2003
- Due Date
- 01-Dec-2003
- Completion Date
- 01-Dec-2003
SIST EN 300 958 V7.0.1:2003 is the Slovenian adoption of ETSI EN 300 958 V7.0.1 for the GSM Explicit Call Transfer (ECT) supplementary service. It specifies Stage 3 radio-interface procedures for how the service is invoked, signalled, notified, activated, deactivated, and interrogated in digital cellular telecommunications systems. The standard is aimed at mobile network and terminal implementers who need the correct call-control behavior at the GSM radio interface.
What does SIST EN 300 958 V7.0.1:2003 specify?
SIST EN 300 958 V7.0.1:2003 specifies the Stage 3 description of the ECT supplementary service. It focuses on procedures at the Um radio interface for normal operation, registration, erasure, activation, deactivation, invocation, and interrogation.
The scope is limited to the ECT supplementary service. Provision and withdrawal of the service are treated as administrative matters between the subscriber and the service provider, and they cause no signalling on the radio interface.
The document is organized into these main parts:
- Clause 1 - Scope
- Clause 2 - References
- Clause 3 - Abbreviations
- Clause 4 - Explicit Call Transfer (ECT)
- Clause 5 - Support by "old" MSs
- Annex A - informative change request history
What are the key requirements of SIST EN 300 958 V7.0.1:2003?
SIST EN 300 958 V7.0.1:2003 defines how the mobile station and network must handle ECT call transfer procedures, message exchanges, remote-party notification, and backward compatibility. In practice, the standard tells implementers when to send FACILITY or REGISTER messages, what state the calls must be in, and how to react when the network accepts or rejects the transfer.
ECT invocation uses two existing calls
Clause 4.1 says ECT is used with two existing calls: one answered and held, and the other answered and active or alerting. The mobile station sends a FACILITY message with an ECT request and must not change the basic or auxiliary state of either call itself. This matters because the transfer must be coordinated by the network, not forced locally by the terminal.
The network response determines the outcome
Clause 4.1 says the network normally accepts the request, connects the two calls, reports success, and then disconnects the served subscriber from both calls. If the request is rejected, the network reports an error and leaves both calls as they were before the request. The mobile station runs timer TECT during the operation, so implementations need failure handling if no network response arrives in time.
Error handling is explicitly classified
Clause 4.2 and Table 1 define the error cases used for ECT, including illegal operation, subscription status, unavailability, incompatibility, facility not supported, system failure, resources not available, and call barred. The response uses the same transaction identifier as the invocation. This gives interoperability teams a clear way to map call-control failures to standard error causes.
Remote-party notification depends on SS Screening indicator
Clause 4.3 says the network sends notifications to remote parties only when it receives a non-zero SS Screening indicator from the remote party's MS. The notifications indicate that the call was transferred and, for the previously held party, that the call has been retrieved. For implementers, this affects what the other parties see during and after the transfer.
Activation and some management procedures do not use radio signalling
Clause 4.4 states that activation and deactivation of ECT cause no signalling on the radio path. Clause 4.5 states that registration, erasure, and interrogation are not applicable. In practice, ECT is a call-control function rather than a separately managed service profile on the air interface.
Older MSs can use USSD under operator control
Clause 5 allows operators to support ECT invocation for mobile stations that do not explicitly support ECT, using USSD. In that case, the MS invokes the service with a REGISTER message and a ProcessUnstructuredSS-Request operation, and the network uses operator-defined text strings for success or error. This section matters for backward compatibility and for mixed fleets of terminals.
What terms does SIST EN 300 958 V7.0.1:2003 define?
SIST EN 300 958 V7.0.1:2003 uses the GSM abbreviation set from GSM 01.04 and several service-specific terms that are central to ECT.
- Explicit Call Transfer (ECT) - the supplementary service that connects two existing calls and then removes the served subscriber from them.
- Mobile Station (MS) - the terminal that sends the ECT request or, for older support, the USSD-based REGISTER message.
- Supplementary Service (SS) - an added service used with GSM call handling; ECT is one such service.
- Unstructured Supplementary Service Data (USSD) - the signalling mechanism used for ECT support by older MSs.
- Transaction Identifier (TI) - the identifier used to tie the ECT exchange to the active, answered, or held call.
- SS Screening indicator - the indicator that controls whether the network sends transfer notifications to remote parties.
- FACILITY message - the layer 3 message used by the MS and network to carry the ECT request and related notifications.
Who uses SIST EN 300 958 V7.0.1:2003?
SIST EN 300 958 V7.0.1:2003 is used by GSM network engineers, switch and protocol implementers, mobile device designers, and interoperability test teams. It is also relevant to operators and service providers that need to support ECT behaviour consistently across their network and terminal base.
In practice, these users apply it when implementing radio-interface signalling, validating call state handling, defining user notifications, and checking backward compatibility with older MSs. Quality and compliance teams use it to verify that ECT behaves as specified during network trials and terminal testing.
What changed in SIST EN 300 958 V7.0.1:2003 from the previous edition?
SIST EN 300 958 V7.0.1:2003 is identified as the Release 1998 version 7.0.1. Annex A records the version trail and shows the January 2000 update to version 7.0.1 for publication, following the earlier Release 1998 version 7.0.0.
Which standards are used with SIST EN 300 958 V7.0.1:2003?
SIST EN 300 958 V7.0.1:2003 references several GSM documents that provide the surrounding framework for ECT:
- GSM 01.04 - abbreviations and acronyms used in the document.
- GSM 02.04 - general principles for supplementary services.
- GSM 02.30 - man-machine interface of the mobile station.
- GSM 02.91 - service-level definition of Explicit Call Transfer.
- GSM 03.11 - technical realization of supplementary services.
- GSM 03.91 - stage 2 description of ECT.
- GSM 04.02 - GSM PLMN access reference configuration.
- GSM 04.07 and GSM 04.08 - layer 3 signalling and call-control procedures.
- GSM 04.10 - general aspects of supplementary services at the layer 3 radio interface.
- GSM 04.80 - formats and coding for supplementary services.
These references matter because this document depends on them for the general GSM signalling rules, coding, and service definitions that ECT builds on.
What does the SIST EN 300 958 V7.0.1:2003 document contain?
SIST EN 300 958 V7.0.1:2003 contains call-flow figures, an error table, and an informative change history. The figures show the message exchanges for ECT invocation, notifications to held and active or alerting remote parties, and the USSD-based procedure for older MSs.
Table 1 gives the ECT error cases used by the network response. Annex A records the change request history for the specification. The document is therefore useful for implementation, integration, and interoperability testing rather than for service marketing or user guidance.
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Frequently Asked Questions
SIST EN 300 958 V7.0.1:2003 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Digital cellular telecommunications system (Phase 2+) (GSM); Explicit Call Transfer (ECT) supplementary service; Stage 3 (GSM 04.91 version 7.0.1 Release 1998)". This standard covers: Upgrade from Phase 2+ to Release 1998
Upgrade from Phase 2+ to Release 1998
SIST EN 300 958 V7.0.1:2003 is classified under the following ICS (International Classification for Standards) categories: 33.070.50 - Global System for Mobile Communication (GSM). The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 300 958 V7.0.1:2003 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-december-2003
'LJLWDOQLFHOLþQLWHOHNRPXQLNDFLMVNLVLVWHP ID]D ±'RSROQLOQDVWRULWHY
QHGYRXPQDSUHGDMDNOLFD (&7 ±VWRSQMD *60 UD]OLþLFDL]GDMD
Digital cellular telecommunications system (Phase 2+) (GSM); Explicit Call Transfer
(ECT) supplementary service; Stage 3 (GSM 04.91 version 7.0.1 Release 1998)
Ta slovenski standard je istoveten z: EN 300 958 Version 7.0.1
ICS:
33.070.50 Globalni sistem za mobilno Global System for Mobile
telekomunikacijo (GSM) Communication (GSM)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
European Standard (Telecommunications series)
Digital cellular telecommunications system (Phase 2+);
Explicit Call Transfer (ECT) supplementary service;
Stage 3
(GSM 04.91 version 7.0.1 Release 1998)
R
GLOBAL SYSTEM FOR
MOBILE COMMUNICATIONS
(GSM 04.91 version 7.0.1 Release 1998) 2 ETSI EN 300 958 V7.0.1 (2000-01)
Reference
REN/SMG-030491Q7
Keywords
Digital cellular telecommunications system,
Global System for Mobile communications (GSM)
ETSI
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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 2000.
All rights reserved.
ETSI
(GSM 04.91 version 7.0.1 Release 1998) 3 ETSI EN 300 958 V7.0.1 (2000-01)
Contents
Intellectual Property Rights.4
Foreword.4
1 Scope .5
2 References.5
3 Abbreviations .7
4 Explicit Call Transfer (ECT) .7
4.1 Normal operation.7
4.2 Explicit Call Transfer invocation.7
4.3 Notification to the remote parties .8
4.3.1 Notification to the held remote party .8
4.3.2 Notification to the active or alerting remote party .9
4.4 Activation and deactivation .9
4.5 Registration, erasure and interrogation.9
5 Support by "old" MSs .9
5.1 Explicit Call Transfer invocation.10
5.2 Notification to the remote parties .10
Annex A (informative): Change Request History .11
History .12
ETSI
(GSM 04.91 version 7.0.1 Release 1998) 4 ETSI EN 300 958 V7.0.1 (2000-01)
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 from the ETSI Secretariat. Latest updates are available on the ETSI Web server
(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 the Special Mobile Group (SMG).
The present document specifies the procedures used at the radio interface for normal operation, registration, erasure,
activation, deactivation, invocation and interrogation of call transfer supplementary services within the digital cellular
telecommunications system.
The specification from which the present document has been derived was originally based on CEPT documentation,
hence the presentation of the present document may not be entirely in accordance with the ETSI/PNE rules.
The contents of the present document is subject to continuing work within SMG and may change following formal SMG
approval. Should SMG modify the contents of the present document it will be re-released with an identifying change of
release date and an increase in version number as follows:
Version 7.x.y
where:
7 indicates Release 1998 of GSM Phase 2+.
x the second digit is incremented for all changes of substance, i.e. technical enhancements, corrections, updates,
etc.
y the third digit is incremented when editorial only changes have been incorporated in the specification.
National transposition dates
Date of adoption of this EN: 31 December 1999
Date of latest announcement of this EN (doa): 31 March 2000
Date of latest publication of new National Standard
or endorsement of this EN (dop/e): 30 September 2000
Date of withdrawal of any conflicting National Standard (dow): 30 September 2000
ETSI
(GSM 04.91 version 7.0.1 Release 1998) 5 ETSI EN 300 958 V7.0.1 (2000-01)
1 Scope
The present document gives the stage 3 description of the call transfer supplementary services.
The present document specifies the procedures used at the radio interface (Reference point Um as defined in
GSM 04.02) for normal operation, registration, erasure, activation, deactivation, invocation and interrogation of call
transfer supplementary services. Provision and withdrawal of supplementary services is an administrative matter
between the mobile subscriber and the service provider and cause no signalling on the radio interface.
In GSM 04.10 the general aspects of the specification of supplementary services at the layer 3 radio interface are given.
GSM 04.80 specifies the formats and coding for the supplementary services.
Definitions and descriptions of supplementary services are given in GSM 02.04, GSM 02.8x and GSM 02.9x-series.
GSM 02.91 is related specifically to call transfer supplementary services.
The technical realization of supplementary services is described in GSM 03.11, GSM 03.8x and GSM 03.9x-series.
GSM 03.91 is related specifically to call transfer supplementary services.
The procedures for Call Control, Mobility Management and Radio Resource management at the layer 3 radio interface
are defined in GSM 04.07 and GSM 04.08.
The following supplementary services belong to the call transfer supplementary services and are described in the present
document:
- Explicit Call Transfer (ECT) (see clause 4).
2 References
The following documents contain provisions which, through reference in this text, constitute provisions of the present
document.
• References are either specific (identified by date of publication, edition number, version number, etc.) or
non-specific.
• For a specific reference, subsequent revisions do not apply.
• For a non-specific reference, 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.
• For this Release 1998 document, references to GSM documents are for Release 1998 versions (version 7.x.y).
[1] GSM 01.04: "Digital cellular telecommunications system (Phase 2+); Abbreviations and
acronyms".
[2] GSM 02.04: "Digital cellular telecommunications system (Phase 2+); General on supplementary
services".
[3] GSM 02.30: "Digital cellular telecommunications system (Phase 2+); Man-Machine Interface
(MMI) of the Mobile Station (MS)".
[4] GSM 02.81: "Digital cellular telecommunications system (Phase 2+); Line identification
supplementary services - Stage 1".
[5] GSM 02.82: "Digital cellular telecommunications system (Phase 2+); Call Forwarding (CF)
supplementary services - Stage 1".
[6] GSM 02.83: "Digital cellular telecommunications system (Phase 2+); Call Waiting (CW) and Call
Hold (HOLD) supplementary services - Stage 1".
ETSI
(GSM 04.91 version 7.0.1 Release 1998) 6 ETSI EN 300 958 V7.0.1 (2000-01)
[7] GSM 02.84: "Digital cellular telecommunications system (Phase 2+); MultiParty (MPTY)
supplementary services - Stage 1".
[8] GSM 02.85: "Digital cellular telecommunications system (Phase 2+); Closed User Group (CUG)
supplementary services - Stage 1".
[9] GSM 02.86: "Digital cellular telecommunications system (Phase 2+); Advice of Charge (AoC)
Supplementary Services - Stage 1".
[10] GSM 02.88: "Digital cellular telecommunications system (Phase 2+); Call Barring (CB)
supplementary services - Stage 1".
[11] GSM 02.90: "Digital cellular telecommunications system (Phase 2+); Unstructured Supplementary
Service Data (USSD )- Stage 1".
[12] GSM 02.91: "Digital cellular telecommunications system (Phase 2+); Explicit Call Transfer
(ECT)".
[13] GSM 03.11: "Digital cellular telecommunications system (Phase 2+); Technical realization of
supplementary services".
[14] GSM 03.81: "Digital cellular telecommunications system (Phase 2+); Line identification
supplementary services - Stage 2".
[15] GSM 03.82: "Digital cellular telecommunications system (Phase 2+); Call Forwarding (CF)
supplementary services - Stage 2".
[16] GSM 03.83: "Digital cellular telecommunications system (Phase 2+); Call Waiting (CW) and Call
Hold (HOLD) supplementary services - Stage 2".
[17] GSM 03.84: "Digital cellular telecommunications system (Phase 2+); MultiParty (MPTY)
supplementary services - Stage 2".
[18] GSM 03.85: "Digital cellular telecommunications system (Phase 2+); Closed User Group (CUG)
supplementary services -
...