SIST EN 300 958 V7.0.1:2003

• Abstract:

  Upgrade from Phase 2+ to Release 1998

• Status: Published
• Publication Date: 30-Nov-2003
• ICS: 33.070.50 - Global System for Mobile Communication (GSM)
• Technical Committee: SS EIT - Technical Board for the electrotechnical, information technology and telecommunications fields
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Dec-2003
• Due Date: 01-Dec-2003
• Completion Date: 01-Dec-2003
• Ref Project: ETSI EN 300 958 V7.0.1 (2000-01) - Digital cellular telecommunications system (Phase 2+) (GSM); Explicit Call Transfer (ECT) supplementary service; Stage 3 (GSM 04.91 version 7.0.1 Release 1998)

Overview

SIST EN 300 958 V7.0.1:2003 specifies the procedures for implementing the Explicit Call Transfer (ECT) supplementary service within the Digital Cellular Telecommunications System (GSM, Phase 2+). ECT enhances GSM networks by enabling subscribers to transfer their active calls to another party, improving call handling flexibility for both users and service providers. This standard represents the Stage 3 (protocol implementation) within Release 1998, solidifying its role in telecommunications modernization and advanced supplementary services.

Key Topics

• Explicit Call Transfer (ECT):
  ECT is a GSM supplementary service that allows a mobile subscriber engaged in two calls (one active/alerting, one held) to connect these calls, transferring both parties and disconnecting the original subscriber.

• Radio Interface Procedures:
  The standard defines how ECT requests and responses are handled over the Um interface (mobile station to network), including:

  • Message flows for ECT invocation
  • Error handling and notifications for all involved parties
  • Use of various transaction identifiers and facility messages

• Activation and Deactivation:
  ECT activation and deactivation operations do not generate signaling traffic on the radio path, streamlining network resource usage.

• Compatibility and Support:
  Older mobile stations (MS) lacking native ECT support can invoke the service via Unstructured Supplementary Service Data (USSD), subject to network operator policies. This ensures broad device interoperability while maintaining network integrity.

• Notification Procedures:
  Comprehensive notification mechanisms ensure that all affected remote parties are properly informed about call transfer events, aligning with GSM privacy and user experience standards.

Applications

• Mobile Call Management:
  ECT empowers users in business, customer service, and personal scenarios by enabling seamless call transfer between parties without manual intervention or call reconnection.

• Operator Network Enhancement:
  By following standardized ECT procedures, network operators can offer value-added wireless services, facilitating efficient handling of high call volumes and complex call scenarios.

• Legacy Device Support:
  The inclusion of USSD-based mechanisms for non-ECT-enabled devices extends service availability across older handset generations, maximising the reach of ECT within the GSM subscriber base.

• Supplementary Service Integration:
  ECT is designed for integration with other GSM supplementary services (e.g., call waiting, hold, multiparty, call forwarding), enhancing the comprehensive suite of mobile telephony features.

Related Standards

To ensure full interoperability and consistent implementation, SIST EN 300 958 V7.0.1 references several GSM technical specifications, including:

• GSM 02.04: General supplementary services
• GSM 02.91: Explicit Call Transfer - service description
• GSM 03.11: Technical realization of GSM supplementary services
• GSM 04.02: GSM PLMN access and reference configuration
• GSM 04.07, GSM 04.08: Mobile radio interface signaling and specifications
• GSM 04.80: Supplementary services formats and coding
• GSM 03.91: Technical description of call transfer supplementary services

Additional Relevant Standards

• GSM 02.30 (Man-Machine Interface)
• GSM 02.83 (Call Waiting and Hold)
• GSM 02.84 (Multiparty Services)
• GSM 03.81-03.85, 03.86, 03.88, 03.90 (Other supplementary services)
• GSM 04.10, 04.26, 04.80 (General and specific radio layer protocols)

Practical Value

Adopting SIST EN 300 958 V7.0.1 ensures:

• Enhanced network feature set and user satisfaction
• Increased flexibility in mobile call handling
• Interoperability across multi-vendor devices and network infrastructure
• Support for legacy and modern GSM equipment
  This standard is fundamental for operators and equipment manufacturers seeking compliance with GSM Release 1998 and the evolving needs of mobile subscribers.

SLOVENSKI STANDARD
01-december-2003
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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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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 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 -
...