SIST EN 300 392-10-4 V1.3.1:2003

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Prizemni snopovni radio (TETRA) – Govor in podatki (V+D) – 10. del: Dopolnilne storitve stopnje 1 – 4. poglavje: Predaja klica (CF)Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 10: Supplementary services stage 1; Sub-part 4: Call Forwarding (CF)33.070.10Prizemni snopovni radio (TETRA)Terrestrial Trunked Radio (TETRA)ICS:Ta slovenski standard je istoveten z:EN 300 392-10-4 Version 1.3.1SIST EN 300 392-10-4 V1.3.1:2003en01-december-2003SIST EN 300 392-10-4 V1.3.1:2003SLOVENSKI
STANDARD
ETSI ETSI EN 300 392-10-4 V1.3.1 (2003-09) 2
Reference REN/TETRA-03093 Keywords CF, data, radio, speech, stage 1, supplementary service, TETRA ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE
Tel.: +33 4 92 94 42 00
Fax: +33 4 93 65 47 16
Siret N° 348 623 562 00017 - NAF 742 C Association à but non lucratif enregistrée à la Sous-Préfecture de Grasse (06) N° 7803/88
Important notice Individual copies of the present document can be downloaded from: http://www.etsi.org The present document may be made available in more than one electronic version or in print. In any case of existing or perceived difference in contents between such versions, the reference version is the Portable Document Format (PDF). In case of dispute, the reference shall be the printing on ETSI printers of the PDF version kept on a specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other ETSI documents is available at http://portal.etsi.org/tb/status/status.asp If you find errors in the present document, send your comment to: editor@etsi.org 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 2003. All rights reserved.
DECTTM, PLUGTESTSTM and UMTSTM are Trade Marks of ETSI registered for the benefit of its Members. TIPHONTM and the TIPHON logo are Trade Marks currently being registered by ETSI for the benefit of its Members. 3GPPTM is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. SIST EN 300 392-10-4 V1.3.1:2003

ETSI ETSI EN 300 392-10-4 V1.3.1 (2003-09) 3
Contents Intellectual Property Rights.5 Foreword.5 Introduction.7 1 Scope.8 2 References.8 3 Definitions, symbols and abbreviations.9 3.1 Definitions.9 3.2 Symbols.10 3.3 Abbreviations.10 4 SS-CF generic specification.11 4.1 Description.11 4.1.1 General description.11 4.1.2 SS-CFU specific features.12 4.1.3 SS-CFB specific features.12 4.1.4 SS-CFNRy specific features.12 4.1.5 SS-CFNRc specific features.13 4.1.6 Authorized users.13 4.2 Procedures.14 4.2.1 Provision/withdrawal.14 4.2.2 Normal procedures.14 4.2.2.1 SS-CF management.14 4.2.2.1.1 Activation/deactivation.14 4.2.2.1.2 Enable/disable.16 4.2.2.1.3 Registration.16 4.2.2.1.4 Interrogation.16 4.2.2.2 Invocation and operation.17 4.2.2.2.1 SS-CF invocation and operation.17 4.2.2.2.2 Forwarded-to user C notification.18 4.2.2.2.3 Calling user A notification.18 4.2.2.2.4 Served user notification.18 4.2.3 Exceptional procedures.18 4.2.3.1 Activation/deactivation.18 4.2.3.2 Interrogation.19 4.2.3.3 Invocation and operation.19 4.3 Interactions with other supplementary services and ANFs.19 4.3.1 Access priority.19 4.3.2 Ambiance listening.19 4.3.3 Area selection.19 4.3.4 Barring of incoming calls.19 4.3.5 Barring of outgoing calls.20 4.3.6 Call authorized by dispatcher.20 4.3.7 Call Completion on No Reply (SS-CCNRy).20 4.3.8 Call Completion to Busy Subscriber (SS-CCBS).20 4.3.9 Call hold.21 4.3.10 Calling/Connected Line Identification Restriction (SS-CLIR/SS-COLR).21 4.3.11 Calling Line Identification Presentation (SS-CLIP).21 4.3.12 Call waiting.21 4.3.12.1 Common to SS-CF.21 4.3.12.2 Call Forwarding Unconditional (SS-CFU).21 4.3.12.3 Call Forwarding On Busy (SS-CFB).21 4.3.12.4 Call Forwarding on No Reply (SS-CFNRy).22 4.3.12.5 Call Forwarding on Not Reachable (SS-CFNRc).22 4.3.13 Call report.22 SIST EN 300 392-10-4 V1.3.1:2003

ETSI ETSI EN 300 392-10-4 V1.3.1 (2003-09) 4
4.3.14 Connected Line Identification Presentation (SS-COLP).22 4.3.15 Discreet listening.22 4.3.16 Dynamic group number assignment.22 4.3.17 Include call.22 4.3.18 Late entry.22 4.3.19 List search call.22 4.3.20 Pre-emptive Priority Call.23 4.3.21 Priority call.23 4.3.22 Short number addressing.23 4.3.23 Talking party identification.23 4.3.24 Interaction with ANF mobility.23 4.4 Interworking considerations.23 5 SS-CF overall SDL.24 6 SS-CFU for SDS specification.28 6.1 General description.28 6.2 Procedures.29 6.3 Interactions with other supplementary services and ANFs.29 6.3.1 Interactions with other supplementary services.29 6.3.2 Interaction with ANF mobility.29 6.4 Interworking considerations.29 Annex A (informative): Bibliography.30 History.31
ETSI ETSI EN 300 392-10-4 V1.3.1 (2003-09) 5
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 ETSI 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://webapp.etsi.org/IPR/home.asp). 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 ETSI 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 Project Terrestrial Trunked Radio (TETRA). The present document is part 10, sub-part 4 of a multi-part deliverable covering Voice plus Data (V+D), as identified below: EN 300 392-1: "General network design"; EN 300 392-2: "Air Interface (AI)"; EN 300 392-3: "Interworking at the Inter-System Interface (ISI)"; ETS 300 392-4: "Gateways basic operation"; EN 300 392-5: "Peripheral Equipment Interface (PEI)"; EN 300 392-7: "Security"; EN 300 392-9: "General requirements for supplementary services"; EN 300 392-10: "Supplementary services stage 1"; ETS 300 392-10-1: "Call identification"; ETS 300 392-10-2: "Call report"; ETS 300 392-10-3: "Talking Party Identification (TPI)"; EN 300 392-10-4:
"Call Forwarding (CF)"; ETS 300 392-10-5: "List Search Call (LSC)"; ETS 300 392-10-6: "Call Authorized by Dispatcher (CAD)"; ETS 300 392-10-7: "Short number addressing"; ETS 300 392-10-8: "Area selection"; ETS 300 392-10-9: "Access priority"; EN 300 392-10-10: "Priority Call (PC)"; ETS 300 392-10-11: "Call Waiting (CW)"; ETS 300 392-10-12: "Call Hold (CH)"; ETS 300 392-10-13: "Call completion to busy subscriber"; EN 300 392-10-14: "Late Entry (LE)"; SIST EN 300 392-10-4 V1.3.1:2003

ETSI ETSI EN 300 392-10-4 V1.3.1 (2003-09) 6
ETS 300 392-10-15: "Transfer of control"; ETS 300 392-10-16: "Pre-emptive priority call"; EN 300 392-10-17: "Include Call (IC)"; EN 300 392-10-18: "Barring of Outgoing Calls (BOC)"; EN 300 392-10-19: "Barring of Incoming Calls (BIC)"; ETS 300 392-10-20: "Discreet Listening (DL)"; EN 300 392-10-21: "Ambience Listening (AL)"; EN 300 392-10-22: "Dynamic Group Number Assignment (DGNA)"; ETS 300 392-10-23: "Call completion on no reply"; ETS 300 392-10-24: "Call Retention (CRT)"; EN 300 392-11: "Supplementary services stage 2"; EN 300 392-12: "Supplementary services stage 3"; ETS 300 392-13: "SDL model of the Air Interface (AI)"; ETS 300 392-14: "Protocol Implementation Conformance Statement (PICS) proforma specification"; TS 100 392-15: "TETRA frequency bands, duplex spacings and channel numbering"; TS 100 392-16: "Network Performance Metrics"; TS 100 392-17: "TETRA V+D and DMO Release 1.1 specifications".
National transposition dates Date of adoption of this EN: 29 August 2003 Date of latest announcement of this EN (doa): 30 November 2003 Date of latest publication of new National Standard or endorsement of this EN (dop/e):
31 May 2004 Date of withdrawal of any conflicting National Standard (dow): 31 May 2004
ETSI ETSI EN 300 392-10-4 V1.3.1 (2003-09) 7
Introduction Supplementary services specifications are produced in three stages, according to the method described in ITU-T Recommendation I.210 [2]. The present document contains the stage 1 specifications of SS-CFU, SS-CFB, SS-CFNRy and SS-CFNRc. The stage 1 descriptions specify the supplementary services as seen by users of networks. The first edition of the present document was presented as a delta document to the first edition of ECMA-173 [1]. The second edition was redrafted based on the latest published text of ECMA-173 [1] as a self contained document so as to be more readable. Additions compared to ECMA-173 [1] were made to take into account particular TETRA specifics such as group calls and to include user requirements and situations not addressed in ECMA-173 [1]. NOTE 1: Contrary to ECMA-173 [1], the present document does not specify SS-CD (Call Deflection) which is not presently supported by TETRA. NOTE 2: Contrary to ECMA-173 [1], distinction is needed in the TETRA environment between "no reply" and "not reachable" because of the radio nature of the TETRA links. The distinction between the two services is that in the case of SS-CFNRy, the calling user obtains an ALERT signal while in the case of SS-CFNRc, the calling user does not obtain any signal.
The present document is updated to take into account improvements to the protocol in stage 3. SIST EN 300 392-10-4 V1.3.1:2003

ETSI ETSI EN 300 392-10-4 V1.3.1 (2003-09) 8
1 Scope The present document specifies the supplementary services Call Forwarding Unconditional (CFU), Call Forwarding Busy (CFB), Call Forwarding on No Reply (CFNRy) and Call Forwarding on Not Reachable (CFNRc) which are applicable to various basic services supported by TETRA SwMIs. Basic services are specified in EN 300 392-2 [4]. SS-CFU, SS-CFB, SS-CFNRy and SS-CFNRc are supplementary services which apply during call establishment providing a forwarding of an incoming call to an other destination than the original destination defined by the calling user under different conditions (busy, no reply or not reachable) or under no condition (unconditional). The present document is applicable to circuit mode TETRA V+D tele-services and bearer services. The present document is also applicable to TETRA Short Data Service (SDS), but limited to the supplementary service Call Forwarding Unconditional (CFU).
Man machine interfaces and charging principles are outside the scope of the present document. The present document specifies also the SS-CF invocation counter, which is applicable to various basic services supported by TETRA networks.
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 and/or edition number or version number) or non-specific. • For a specific reference, subsequent revisions do not apply. • For a non-specific reference, the latest version applies. Referenced documents which are not found to be publicly available in the expected location might be found at http://docbox.etsi.org/Reference. [1] ECMA-173: "Private Integrated Services Network (PISN) - Specification, Functional Model and Information Flows - Call Diversion Supplementary Services (CFSD)". [2] ITU-T Recommendation I.210: "Principles of telecommunication services supported by an ISDN and the means to describe them". [3] ITU-T Recommendation Z.100: "Specification and description language (SDL)". [4] ETSI EN 300 392-2: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 2: Air Interface (AI)". [5] ITU-T Recommendation Q.9: "Vocabulary of switching and signalling terms". [6] ETSI EN 300 392-12-4: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 12: Supplementary services stage 3; Sub-part 4: Call Forwarding (CF)". [7] ETSI EN 300 392-3-2: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 3: Interworking at the Inter-System Interface (ISI); Sub-part 2: Additional Network Feature Individual Call (ANF-ISIIC)". [8] ETSI EN 300 392-7: "Terrestrial Trunked Radio (TETRA); Voice plus Data (V+D); Part 7: Security". SIST EN 300 392-10-4 V1.3.1:2003

ETSI ETSI EN 300 392-10-4 V1.3.1 (2003-09) 9
3 Definitions, symbols and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply: Additional Network Feature (ANF): capability, over and above that of a basic service, provided by a SwMI, but not directly to a SwMI user authorized user: user who is responsible for the definition, activation and deactivation of the service NOTE: The authorized user may also interrogate the service. busy: TETRA destination is considered to be busy if either a "network determined user busy" or a "user determined user busy" condition exists call, basic call: instance of the use of a basic service connected number: number of the user that answers (user C) forwarded-to number: number to which a call is forwarded forwarded-to user: user to which a call is forwarded forwarding: redirection of a call, on behalf of a called user and prior to connect, to a number different from the number of that called user forwarding cause: contains the reason for the forwarding: CFU, CFB, CFNRy, CFNRc forwarding number: number of the served user forwarding user: user for which the call forwarding is invoked; it may be the called user first and then any of the successive forwarded-to users (see also last forwarding user) forward switching: network routeing algorithm which performs the forwarding by joining together the first connection from user A's node to user B's node and a second, new connection from user B's node to user C's node last forwarding user: served user from the point of view of the forwarded-to user for a particular stage of call forwarding NOTE:
In the case of a call subject to a single stage of call forwarding, user B is the last forwarding user from the point of view of user C. In the case of a call subject to multiple stages of call forwarding, user B1 is the last forwarding user from the point of view of user B2, user B2 is the last forwarding user from the point of view of user B3, etc. The served user for the final stage of call forwarding is the last forwarding user from the point of view of user C. Mobile Station (MS): physical grouping that contains all of the mobile equipment that is used to obtain TETRA services. By definition, a mobile station contains at least one Mobile Radio Stack (MRS) original called number: number of user B (in case of multiple call forwarding user B1) original called user: first served user of a call which is subject to one or more stages of call forwarding, i.e. user B or B1 partial re-routeing: network routeing algorithm which performs the call forwarding by replacing a particular part of the connection from user A's node to user B's node by another connection from user A's node to user C's node SDS message: status or any type of SDS message NOTE: This definition is used in the present document to combine all TETRA STATUS and SDS messages as defined in clause 13.3 of EN 300 392-2 [4]. signalling connection: connection used to exchange information between peer supplementary service protocol control entities independently of a basic call SIST EN 300 392-10-4 V1.3.1:2003

ETSI ETSI EN 300 392-10-4 V1.3.1 (2003-09) 10 SS-CF invocation counter: counter for the number of forwarding involved in a call or signalling connection during the establishment phase supplementary service: any service provided by a network in addition to its basic service or services (defined in ITU-T Recommendation Q.9)
NOTE: A supplementary service modifies or supplements a basic telecommunication service. Consequently, it cannot be offered to a customer as a stand alone service. It must be offered together with or in association with a basic telecommunication service (extract from ITU-T Recommendation I.210 [2]) Switching and Management Infrastructure (SwMI): all of the TETRA equipment for a Voice plus Data (V+D) network except for subscriber terminals NOTE: The SwMI enables subscriber terminals to communicate with each other via the SwMI. SwMI number: number belonging to a SwMI numbering plan re-routeing: network routeing algorithm which performs the call forwarding by replacing the connection from user A's node to user B's node by another connection from user A's node to user C's node served user: user of a particular SwMI number who is requesting that calls to his number be forwarded NOTE: This user may also be referred to as the forwarding user or the called user. tele-service: type of telecommunications service that provides the complete capability, including terminal equipment functions, for communication between users according to agreed protocols served user: user for whom the supplementary service is invoked user: entity using the services of a telecommunications network via an externally accessible service access point NOTE 1: Unless otherwise noted, the word user is to be understood as individual or group. NOTE 2: A user may be a person or an application process. user application: application process which acts as a user (see definition of user) user A: calling user of a call which is subject to call forwarding user B: served (forwarding) user of a call which is subject to call forwarding. NOTE: User B is also known as the (original) called user. user B1, user B2, user B3, etc.: these are the served (forwarding) users of a call which are subject to multiple stages of forwarding NOTE 1: B1 is the first served user, B2 is the second served user, B3 is the third served user, etc. NOTE 2: B2 is also the forwarded-to user with respect to the first stage of call forwarding, B3 is also the forwarded-to user with respect to the second stage of call forwarding, etc. user C: forwarded-to user with respect to the final stage of call forwarding 3.2 Symbols For the purposes of the present document, the symbols defined in ITU-T Recommendation Z.100 [3] apply. 3.3 Abbreviations For the purposes of the present document, the following abbreviations apply: ANF Additional Network Feature GTSI Group TETRA Subscriber Identity ISDN Integrated Services Digital Network
ISI Inter System Interface SIST EN 300 392-10-4 V1.3.1:2003

ETSI ETSI EN 300 392-10-4 V1.3.1 (2003-09) 11 ITSI Individual TETRA Subscriber Identity
MS Mobile Station NDUB Network Determined User Busy SDL Specification and Description Language SDS Short Data Service SS Supplementary Service
NOTE: The abbreviation SS is only used when referring to a specific supplementary service. SwMI Switching and Management Infrastructure TE Terminal Equipment TETRA Terrestrial European Trunked Radio UDUB User Defined User Busy V+D Voice Plus Data Supplementary service abbreviations: AL Ambience Listening BIC Barring of Incoming Calls BOC Barring of Outgoing Calls CAD Call Authorized by Dispatcher CCBS Call Completion to Busy Subscriber (TETRA) CCNR Call Completion on No Reply (TETRA) CF Call Forwarding CFB Call Forwarding on Busy CFNRc Call Forwarding on Not Reachable CFNRy Call Forwarding on No Reply CFU Call Forwarding Unconditional CLIP Calling Line Identification Presentation CLIR Calling/Connected Line Identification Restriction COLP COnnected Line Identification Presentation COLR COnnected Line Identification Restriction CR Call Report CW Call Waiting DL Discreet Listening IC Include Call PC Priority Call PPC Pre-emptive Priority Call SNA Short Number Addressing 4 SS-CF generic specification 4.1 Description 4.1.1 General description This generic specification groups together all elements common to the four Call Forwarding procedures (CFU, CFB, CFNRy and CFNRc).
SS-CF enables a served user to have the network redirect, to either an ITSI, to a GTSI or to an external subscriber number, calls which are addressed to the served user's ITSI/GTSI/external subscriber number. SS-CF may operate on all calls or just those associated with specified basic services. The served user's ability to originate calls is unaffected by SS-CF. SS-CF is provided on a per ITSI/GTSI basis. SIST EN 300 392-10-4 V1.3.1:2003

ETSI ETSI EN 300 392-10-4 V1.3.1 (2003-09) 12 NOTE 1: The external subscriber number has two distinct meaning in the relation to the SS-CF: - number of an external subscriber not belonging to TETRA network(s); and
- number given to a TETRA subscriber in addition to the ITSI of that user; known also as MS-ISDN number.
Only the ITSI/GTSI is supported in the management of the SS-CF. For the operation of the SS-CF the MS-ISDN number is first converted into the equivalent ITSI. SS-CF invocation counting shall be invoked in conjunction with a call forward request when it is desired to limit the number of forwarding that the call can encounter. The number of maximum call forwarding invocations for a single call is a network implementation option. When counting the number of forwarding, all types of forwarding shall be included. NOTE 2: EN 300 392-3-2 [7] uses also transit counter information element in the ISI-SETUP PDU. That information element is intended for the same purpose over Inter-System Interface as the SS-CF invocation counter, which is also applicable inside a single SwMI. The transit counter and the SS-CF invocation counter are independent of each other. Call forwarding of an individual call may be either to an ITSI, to a GTSI or to an external subscriber number. Group calls may be forwarded to either an ITSI or a GTSI (i.e. the communication type as defined in EN 300 392-2 [4], clause 14.8.2 may change due to forwarding) or optionally to an external number. In the case of the set-up of a group call, the activation of SS-CF by an individual member of the group (on his individual number) does not invoke SS-CF for the group call. Generally a non-member of the group shall not be accepted to activate SS-CF on the group. In the case that multiple call forwarding types are activated at the same time for the served user the SS-CFU takes precedence over all other types.
Forwarding counter counts the number of forwarding that a call has been forwarded and allows to limit the number of forwarding that a call request may encounter during call establishment, e.g. to protect the network against indefinite looping. There is no user involved in the provision or operation of forwarding counter. 4.1.2 SS-CFU specific features SS-CFU enables served user to have the network redirect calls to him unconditionally to the forwarded-to user. NOTE: In TETRA the call is not offered to the served user at all. SS-CFU is applicable to voice, circuit mode data and SDS messages for both individual and group calls/messages.
4.1.3 SS-CFB specific features SS-CFB enables a served user to have the network redirect incoming calls to another ITSI/GTSI/external subscriber number, if they meet a busy condition at the served user. The network detects busy condition (NDUB) or the called user may invoke busy condition (UDUB). NOTE 1: The UDUB condition is detected, when the user disconnects the call with a suitable disconnection reason without answering to it. SS-CFB is applicable to voice and circuit mode data for both individual and group calls.
NOTE 2: The conditions that lead to the declaration of a group as being busy are outside the scope of the present document. 4.1.4 SS-CFNRy specific features SS-CFNRy enables a served user to have the network redirect incoming calls to another ITSI/GTSI/external subscriber number, if the connection is not established within a predefined time of alerting. The predefined alerting time is should be set to be less than maximum call set-up time. The predefined time value is outside the scope of the present document.
SS-CFNRy is applicable to voice and circuit mode data for individual calls. SIST EN 300 392-10-4 V1.3.1:2003

ETSI ETSI EN 300 392-10-4 V1.3.1 (2003-09) 13 SS-CFNRy may not be applicable to calls established with direct signalling. SS-CFNRy is not applicable to group calls. NOTE: If the called user disconnects the call without answering, then the SS-CFNRy will not be invoked. 4.1.5 SS-CFNRc specific features SS-CFNRc permits a called user to have the network redirect incoming calls, when the served user is not reachable, to forwarded-to user ITSI/GTSI/external subscriber number. SS-CFNRc is applicable to voice and circuit mode data for individual calls. The resulting call may be a group call. NOTE 1: Not reachable condition may be detected in the network e.g. user is not registered or at the call set-up signalling, when that fails e.g. due to a bad propagation condition.
NOTE 2: For the purposed of the present document a group may never be found "not reachable". 4.1.6 Authorized users For the purposes of the present document a generic term authorized user has been used. At least following roles of authorized users are identified: - served user himself; - authorized user created by the served user using enable process; - forwarded-to user;
- authorized user defined upon subscription; and - authorized user defined by network operator. Table 1 outlines the roles of authorized users. A generic authorized user is used for the authorized user defined upon subscription and authorized user defined by network operator. The capabilities identified in the table 1 are optional and TETRA network may support any set of the capabilities. The present document does not set any restrictions nor rules, who may be an authorized user, e.g. dispatcher may be an authorized user for the group members. The same user may also have multiple authorized user's roles e.g. the forwarded-to user may be also a created authorized user. Table 1: Authorized users' roles Authorized user type Activation/deactivation capability Enabling/disabling capability Interrogation capability Remarks Served user Himself, unless a permanent activation is applied Created or predefined authorized users, see note Himself Limits of activation and enabling are defined upon subscription Created authorized user On behalf of the served user N/A On behalf of the served user
Upon disabling looses all capabilities Forwarded-to user Only deactivation of the SS-CF he is the forwarded-to user N/A Only activation of the SS-CF he is the forwarded-to user Upon deactivation looses all capabilities Authorized user On behalf of the served user Created and predefined authorized users and potentially other authorized users
On behalf of the served user Limits of activation and enabling are defined upon subscription NOTE: Optionally enabling may be used both to create and enable authorized users.
ETSI ETSI EN 300 392-10-4 V1.3.1 (2003-09) 14 4.2 Procedures 4.2.1 Provision/withdrawal Provision and withdrawal of SS-CF shall be by pre-arrangement with the service provider. SS-CF subscription shall be on ITSI/GTSI basis. For each ITSI/GTSI the supplementary service may be subscribed to any combination of the basic services subscribed to at that ITSI/GTSI.
NOTE: Subscription related actions are outside the scope of the present document. The subscription options and values offered by a SwMI are an implementation matter. The stage 3 standard [6] supports the options and values specified in table 2. A SwMI may offer more or less options and values than those specified in table 2. Subscription options may apply separately to each basic service subscribed to on each ITSI/GTSI. Different subscription options may be applied to different services for the same ITSI/GTSI, e.g. SS-CF for voice may have different subscription option than SS-CF for circuit mode data or SDS for the same ITSI/GTSI. Subscription options for one call forwarding supplementary service may be different from corresponding subscription options for another call forwarding supplementary services for the same ITSI/GTSI. Contrary to ECMA-173 [1], the served user/forwarding user does not receive notification that a call has been forwarded; this applies also to all the intermediate served users/forwarding users. Contrary to ECMA-173 [1], the calling user receives notification that call has been forwarded has only one possible value "Yes without forwarded-to ITSI/GTSI/external number". The calling use may independently invoke SS-CI (COLP) in order to get information about the connected user ITSI/GTSI/external subscriber number. Table 2: Subscription options Subscription options Value Permanent activation - Yes - No Served user releases his
ITSI/GTSI to forwarded-to user - No - Yes
SS-CF invocation counter shall be generally applied for all calls/messages that involve call forwarding. 4.2.2 Normal procedures 4.2.2.1 SS-CF management
4.2.2.1.1 Activation/deactivation SS-CF may be either permanently activated upon subscription or by other means or activated/deactivated under user control.
The activation/deactivation upon subscription and by other means are outside the scope of the present document. If activation/deactivation is supported under user control, the SwMI may provide for activation/deactivation by authorized users (served user or not), refer to table 1. Any combination of the SS-CF types may be activated/deactivated at any time for each basic service and for any TSI subscribed to the service. Each SS-CF type and basic service combination may be defined for different forwarded-to users. The forwarded to user may be an ITSI, GTSI or external subscriber number.
NOTE 1: The served user of the forwarding cannot be the forwarded-to user (forwarding back to the same number). The present document places no restriction on which authorized users (defined upon subscription or by the network operator) may activate or deactivate forwarding on behalf of any served user, refer to table 1. Authorized users may have different capability limitations than described in the table 1. The restrictions may be defined by the network operator or by implementation. One authorized user (including the served user) may activate a forwarding and another authorized user (again including the served user) may deactivate the same forwarding at the served user.
ETSI ETSI EN 300 392-10-4 V1.3.1 (2003-09) 15 Any authorized user may activate SS-CF on behalf of the served user such that the activating (e.g. authorized user) user becomes the forwarded-to user.
In the case of SS-CF involving a served user being a served group, SS-CF may be permanently activated upon subscription for that group GTSI or may be activated/deactivated by an authorized user. A member of a group shall not be able to activate/deactivate SS-CF for the group he is a member of unless he is an authorized user. NOTE 2: On the SS-CF activation capability point of view the members of the group are not the served users in the same sense as for ITSI. The features applicable to the served user on the GTSI may be allocated to an authorized user. The management and allocation of that is outside the scope of the present document. Any forwarded-to user may be able to become an authorized user for the deactivation of SS-CF for the basic services and the forwarding procedures for which this user is defined as a forwarded-to user for the duration he is the forwarded-to user, refer to table 1. The forwarded-to user is considered to be a temporary authorized user; the forwarded-to user shall lose this authorized user capability as soon as SS-CF is deactivated in this way, and shall not regain the deactivation capability if SS-CF is activated again to a different forwarded-to user. When an activation/deactivation procedure is performed successfully by an authorized user, the served user may be notified. The use of the notification is dependent of served user network options. The notification to the served user may include the ITSI/GTSI/external number of the forwarded-to user, forwarding types and the basic services. If the notification is not possible at the activation/deactivation time e.g. the served user is not reachable, then the SwMI may later, at a suitable time, send the notification to the served user. NOTE 3: The authorized user gets the same information as part of the activation procedure. NOTE 4:
The use of a password facility for authorized user activation as an implementation option is not excluded. To activate SS-CF, the authorized user shall: 1) define the forwarded-to user ITSI/GTSI/external subscriber number; 2) indicate the basic service or services for which it applies. NOTE 5: A verification that the forwarded-to user ITSI/GTSI/external subscriber number exists and that the specified basic service is subscribed to at that ITSI/GTSI/external number may be carried out before accepting the SS-CF activation request. This verification is outside the scope of the present document. The service provider shall return notification of acceptance of the request. Notification of acceptance shall include the ITSI/GTSI/external subscriber number of the forwarded-to user to whom the SS-CF is active. It shall be possible to deactivate SS-CF by means of an explicit request for deactivation. An explicit request for deactivation shall be treated as follows: - if deactivation of SS-CF for an individual basic service is requested, it shall be accepted only if SS-CF is already activated for that basic service; - if deactivation of SS-CF collectively for all basic services is requested, it shall result in the discarding of any forwarded-to ITSI/GTSI/External Numbers for individual basic services and any forwarded-to ITSI/GTSI/External Number collectively for all basic services. It shall be possible to deactivate SS-CF by activating SS-CF to a different forwarded-to ITSI/GTSI/External Number. A request for activation of SS-CF when SS-CF is already activated shall be treated as follows: - if activation of SS-CF for an individual basic service is requested, it shall be accepted only if SS-CF is not already activated collectively for all basic services and, if SS-CF is already activated for that individual basic service, shall result in the overwriting of the existing forwarded-to ITSI/GTSI/External Number; - if activation of SS-CF collectively for all basic services is requested, it shall result in the discarding of any existing forwarded-to ITSI/GTSI/External Numbers for each basic service and the overwriting of any existing forwarded-to ITSI/GTSI/External Number collectively for all basic services. The nominated forward-to party is not informed when SS-CF is activated/deactivated at a served party. The served/authorized user performed activation/deactivation process is optional. SIST EN 300 392-10-4 V1.3.1:2003

ETSI ETSI EN 300 392-10-4 V1.3.1 (2003-09) 16 4.2.2.1.2 Enable/disable The served user should be able to enable/disable any authorized user' activation/deactivation capability on behalf of himself as defined upon subscription. Optionally the served user may create au
...