SIST EN 301 175 V1.1.1:2003

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.HCordless Terminal Mobility (CTM); Phase 1; Service description33.070.30'(&7Digital Enhanced Cordless Telecommunications (DECT)33.050.01Telekomunikacijska terminalska oprema na splošnoTelecommunication terminal equipment in generalICS:Ta slovenski standard je istoveten z:EN 301 175 Version 1.1.1SIST EN 301 175 V1.1.1:2003en01-december-2003SIST EN 301 175 V1.1.1:2003SLOVENSKI
STANDARD
EN 301 175 V1.1.1 (1998-08)European Standard (Telecommunications series)Cordless Terminal Mobility (CTM);Phase 1;Service descriptionSIST EN 301 175 V1.1.1:2003

ETSIEN 301 175 V1.1.1 (1998-08)2ReferenceDEN/NA-020039 (avo00ico.PDF)KeywordsCTM, DECT, mobility, stage 1ETSIPostal addressF-06921 Sophia Antipolis Cedex - FRANCEOffice address650 Route des Lucioles - Sophia AntipolisValbonne - FRANCETel.: +33 4 92 94 42 00
Fax: +33 4 93 65 47 16Siret N° 348 623 562 00017 - NAF 742 CAssociation à but non lucratif enregistrée à laSous-Préfecture de Grasse (06) N° 7803/88Internetsecretariat@etsi.frhttp://www.etsi.frhttp://www.etsi.orgCopyright NotificationNo 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.SIST EN 301 175 V1.1.1:2003

ETSIEN 301 175 V1.1.1 (1998-08)3ContentsIntellectual Property Rights.6Foreword.61Scope.72Normative references.83Definitions.84 Abbreviations.105Description.105.1Core service features.105.1.1Numbering.105.1.2Outgoing call.115.1.3Emergency call.115.1.4Incoming call.115.1.5Roaming.115.1.6Handover.115.1.7Security.115.1.7.1Terminal authentication.125.1.7.2Network authentication.125.1.7.3Encryption.125.1.8Service profile.125.2Optional service features.125.2.1Service profile modification.125.2.2Service profile interrogation.126Procedures.136.1Provision and withdrawal.136.2Normal procedures.136.2.1Registration, deregistration and erasure.136.2.1.1Core requirements.136.2.1.2Optional requirements.136.2.2Activation and deactivation.146.2.2.1Core requirements.146.2.2.2Optional requirements.146.2.3Invocation and operation.146.2.3.1Core requirements.146.2.3.2Optional requirements.156.2.4Interrogation.156.2.4.1Core requirements.156.2.4.2Optional requirements.156.3Exceptional procedures.156.3.1Registration and erasure.156.3.1.1Core requirements.156.3.1.2Optional requirements.156.3.2Activation and deactivation.156.3.2.1Core requirements.156.3.2.2Optional requirements.156.3.3Invocation and operation.166.3.3.1Core requirements.166.3.3.2Optional requirements.166.3.4Interrogation.166.3.4.1Core requirements.166.3.4.2Optional requirements.167Interworking requirements.177.1Interworking between public networks providing the CTM service.17SIST EN 301 175 V1.1.1:2003

ETSIEN 301 175 V1.1.1 (1998-08)47.1.1Public CTM user roams into a visited public network.177.2Interworking with private networks.177.2.1Public CTM user roams into a Private Integrated Service Network (PISN) area.177.2.2Private CTM user roams into a public CTM network area.187.3Interworking with networks not providing the CTM service.187.4Co-operation between network operators and service providers.188Interaction with ISDN supplementary services.188.1Number identification services.188.1.1Calling line identification presentation.188.1.2Calling line identification restriction.198.1.3Connected line identification presentation.198.1.4Connected line identification restriction.198.2Closed user group.198.3Call completion services.198.3.1Completion of calls to busy subscriber.198.3.2Completion of calls on no reply.198.4Malicious call identification.199Interaction with other services.199.1Universal Personal Telecommunication (UPT).1910Applicability of supplementary services to the CTM service.20Annex A (normative):CFNRc supplementary service.21A.1Scope.21A.2Normative references.21A.3Definitions.21A.4Symbols and abbreviations.22A.5Description.22A.6Procedures.23A.6.1Provision and withdrawal.23A.6.2Normal procedures.23A.6.2.1Activation, deactivation, registration and erasure.23A.6.2.1.1Activation.23A.6.2.1.2Deactivation.23A.6.2.1.3Registration.23A.6.2.1.4Erasure.23A.6.2.2Invocation and operation.24A.6.2.2.1Served user's view.24A.6.2.2.2Forwarded-to user's view.24A.6.2.2.3Calling user's view.24A.6.2.3Interrogation.24A.6.3Exceptional procedures.25A.6.3.1Activation, deactivation, registration and erasure.25A.6.3.1.1Activation.25A.6.3.1.2Deactivation.25A.6.3.1.3Registration.25A.6.3.1.4Erasure.25A.6.3.2Invocation and operation.25A.6.3.3Interrogation.26A.7Intercommunication considerations.26A.7.1Interworking with non-ISDNs.26A.7.2Interworking with private ISDN.26A.8Interaction with other (supplementary) services.26A.8.1Number identification services.27A.8.1.1Calling line identification restriction.27SIST EN 301 175 V1.1.1:2003

ETSIEN 301 175 V1.1.1 (1998-08)5A.8.1.2Connected line identification restriction.27A.8.2Diversion services.27A.8.2.1Call forwarding on not reachable.27A.8.3Remote control service.27History.28SIST EN 301 175 V1.1.1:2003

ETSIEN 301 175 V1.1.1 (1998-08)6Intellectual Property RightsIPRs essential or potentially essential to the present document may have been declared to ETSI. The informationpertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be foundin SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respectof ETSI standards", which is available free of charge from the ETSI Secretariat. Latest updates are available on theETSI 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 guaranteecan 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.ForewordThis European Standard (Telecommunications series) has been produced by ETSI Technical Committee NetworkAspects (NA).In analogy with CCITT Recommendations I.130 [6], the first stage of the following three level structure is used todescribe the telecommunications services as provided by European public telecommunications operators:-Stage 1: is an overall service description, from the service subscriber’s and user’s standpoint;-Stage 2: identifies the functional capabilities and information flows needed to support the service described instage 1; and-Stage 3: defines the signalling system protocols and switching functions needed to implement the servicedescribed in stage 1.The present document details the stage 1 aspects (overall service description) for the Cordless Terminal Mobility (CTM)service, taking into account the various network architectures, e.g., Intelligent Network (IN).The application of stage 2 and stage 3 may be different when the service is supported on an IN environment.National transposition datesDate of adoption of this EN:7 August 1998Date of latest announcement of this EN (doa):30 November 1998Date of latest publication of new National Standardor endorsement of this EN (dop/e):31 May 1999Date of withdrawal of any conflicting National Standard (dow):31 May 1999SIST EN 301 175 V1.1.1:2003

ETSIEN 301 175 V1.1.1 (1998-08)71ScopeThe present document defines the stage 1 service description for phase 1 of the Cordless Terminal Mobility (CTM)service. Stage 1 is an overall service description, primarily from the service subscriber’s and user’s point of view, butdoes not deal with the details of the human interface itself. The present document includes information applicable tonetwork operators and terminal, switch and database manufacturers.The present document specifies the requirements where the service is provided to the CTM user via atelecommunications network that is either the pan-European Integrated Services Digital Network (ISDN) or a PublicSwitched Telephone Network (PSTN) as provided by European public telecommunications operators.The present document includes interworking requirements for cases where users in a call are located on differentnetworks.The provision of the CTM service on mobile networks is outside the scope of the present document.The present document contains the core requirements for phase 1 of the Cordless Terminal Mobility (CTM) service. Aservice may be provided on the basis of these core requirements alone.The present document also documents some optional service features which may be used to enhance the service.Furthermore, additional functionalities not documented in the present document may be implemented. The requirementsof which are considered outside of the scope of the present document and consequently outside the scope of thecorresponding stage 2 and stage 3 standards. Such additional functionality may be on a network-wide basis, or particularto one CTM user or a group of CTM users. Such additional functionality does not compromise conformance to the corerequirements of the service.Charging principles are outside the scope of the present document, unless specific service requirements are stated. Theserequirements deal with the allocation of certain call charges to particular CTM users.Interactions with services/supplementary services not listed in clauses 8 and 9 are outside the scope of the presentdocument.The Cordless Terminal Mobility (CTM) service allows users of cordless terminals to be mobile within and betweennetworks. Where radio coverage is provided and the cordless terminal has appropriate access rights the CTM user isable to make calls from, and to receive calls at, any location within the fixed public and/or private networks, and maymove without interruption of a call in progress.Phase 1 of the Cordless Terminal Mobility (CTM) service is applicable to the telephony 3,1 kHz teleservice (see ETS300 111 [2]). Phase 1 of the CTM service is also applicable to the speech bearer service (see ETS 300 109 [3]) and the3,1 kHz audio bearer service (see ETS 300 110 [4]).If the present document is applicable to the stage 2 and stage 3 standards for the phase 1 of the CTM service, where thetext indicates the status of a requirement (i.e. as strict command or prohibition, as authorization leaving freedom, as acapability or a possibility), this shall be reflected in the relevant stage 2 and stage 3 standards. Otherwise, the status of arequirement shall be reflected in the relevant standards for the underlying protocols. Furthermore, conformance to thepresent document is either met by:-conforming to the stage 3 standards; or-implicitly covered by conforming to the standards for the underlying protocols,with the field of application appropriate to the equipment being implemented. Therefore no method of testing isprovided for the present document.SIST EN 301 175 V1.1.1:2003

ETSIEN 301 175 V1.1.1 (1998-08)82Normative referencesReferences may be made to:a)specific versions of publications (identified by date of publication, edition number, version number, etc.), inwhich case, subsequent revisions to the referenced document do not apply; orb)all versions up to and including the identified version (identified by "up to and including" before the versionidentity); orc)all versions subsequent to and including the identified version (identified by "onwards" following the versionidentity); ord)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 samenumber.[1]ETS 300 345 (1994): "Integrated Services Digital Network (ISDN); Interworking between publicISDNs and private ISDNs for the provision of telecommunication services; General aspects".[2]ETS 300 111 (1992): "Integrated Services Digital Network (ISDN); Telephony 3,1 kHzteleservice; service description".[3]ETS 300 109 (1992): "Integrated Services Digital Network (ISDN); Circuit-mode 64 kbit/s 8 kHzstructured bearer service category usable for speech information transfer; Service description".[4]ETS 300 110 (1992): "Integrated Services Digital Network (ISDN); Circuit-mode 64 kbit/s 8 kHzstructured bearer service category usable for 3,1 kHz audio information transfer; Servicedescription".[5]CCITT Recommendation E.164 (1991): "Numbering plan for the ISDN era".[6]CCITT Recommendation I.130 (1988): "Method for the characterization of telecommunicationservices supported by an ISDN and network capabilities of an ISDN".[7]CCITT Recommendation I.112 (1988): "Vocabulary of terms for ISDNs".[8]CCITT Recommendation I.210 (1988): "Principles of telecommunication services supported by anISDN and the means to describe them".[9]CCITT Recommendation Q.9 (1988): "Vocabulary of switching and signalling terms".3DefinitionsFor the purposes of the present document, the following definitions apply:authentication: A security mechanism allowing the verification of the provided identity.access rights: An indication that the cordless terminal has appropriate access allowance to the CTM service.NOTE 1:This definition does not refer to any specific access technology.access rights identity: An identity which is globally unique to a service provider and which shows the access rightsrelated to this service provider.Basic Call (procedures): The procedures by which a call (as an instance of a basic telecommunication service) isestablished and terminated.NOTE 2:Emergency call is not a basic call.cordless terminal: A physical entity that provides access to the telecommunication services of a network via a radiointerface.SIST EN 301 175 V1.1.1:2003

ETSIEN 301 175 V1.1.1 (1998-08)9core service feature: Particular service feature fundamental to the telecommunication service, i.e., in the absence of thisservice feature, the telecommunication service does not make sense as a commercial offering to the service subscriber.coverage area: The area within the radio coverage area in which the user has subscribed to use the CTM service.CTM identity: The identity by which a user is known to the CTM service providers and networks supporting CTM, andit is used for flexibility and security purposes. The CTM identity identifies a CTM user unambiguously. The CTMidentity does not need to be known by users.CTM number: A number that uniquely and unambiguously identifies each user. It is used by a calling party to reach theCTM user. The number is independent of the calling terminal, network or service used and it is an E.164 number.E.164 number: A number conforming to the numbering plan and structure specified in CCITT RecommendationE.164 [5].forwarded-to number: A number to which the call is redirected as a result of call forwarding.handover: The process by which a call in progress is maintained when the CTM user moves with the cordless terminalwith a call in progress within a network where continuous radio coverage is provided.location area: The radio coverage area in which a cordless terminal may receive calls as a result of a single locationregistration.location registration: The process whereby the position of a CTM terminal is determined to the level of one locationarea.network operator: An entity that provides the network operating elements and resources for the execution of the CTMservice.not reachable: The status in the network when an incoming call is offered to a cordless terminal but the cordlessterminal is out of radio coverage, switched off or there is radio congestion.optional service feature: A service feature added to core feature to optionally enhance a service offering.radio coverage: The area in which cordless terminals may be used to establish and maintain telecommunicationservices via the radio base stations supported by the network supporting the CTM service.NOTE 3:The radio coverage supported by an individual network supporting the CTM service may be continuous ordiscontinuous, i.e. it may correspond to the complete geographical territory served by the network or itmay not.In the case of discontinuous radio coverage, the areas of radio coverage may consist of individual radiocells, serving for example isolated houses or very small businesses, or cordless islands consisting of acollection of radio cells providing continuous coverage of larger areas.The radio coverage supported by a network supporting the CTM service may overlap with the radiocoverage supported by one or more other networks supporting the CTM service or it may becomplementary.roaming: The CTM user moves with the cordless terminal without a call in progress from one location area to anotherlocation area within the same and/or between different networks supporting the CTM service.service feature: A specific aspect of a telecommunication service that can also be used in conjunction with othertelecommunication services or service features as part of a commercial offering. It is either a core part of atelecommunication service or an optional part offered as an enhancement to a telecommunication service.service profile: A record containing all the service information related to a CTM user.service provider: An actor who provides CTM services to its service subscribers on a contractual basis and who isresponsible for the CTM services offered. The same organization may act as a network operator and a service provider.service subscriber: An entity that contracts for services offered by service providers.service: That which is offered by an administration or a public or private service provider to its service subscriber inorder to satisfy a telecommunication requirement.SIST EN 301 175 V1.1.1:2003

ETSIEN 301 175 V1.1.1 (1998-08)10terminal mobility: The ability of a terminal to access telecommunication services, while in motion, and the capabilityof the network to locate and identify that terminal as it moves.user: A person or machine delegated by a service subscriber to use the services and/or facilities of a telecommunicationnetwork .4AbbreviationsFor the purposes of the present document, the following abbreviations apply:CFNRcCall Forwarding on Not ReachableCLIRCalling Line Identification RestrictionCOLRConnected Line Identification RestrictionCTMCordless Terminal MobilityDTMFDual Tone Multi FrequencyINIntelligent NetworkISDNIntegrated Services Digital NetworkPISNPrivate Integrated Services NetworkPSPDNPacket-Switched Public Data NetworkPSTNPublic Switched Telephone NetworkUPTUniversal Personal Telecommunication5DescriptionThe CTM service allows users of cordless terminals to be mobile within and between networks. Where radio coverage isprovided and the cordless terminal has appropriate access rights the CTM user shall be able to make calls from, and toreceive calls at, any location within the fixed public and/or private networks, and may move without interruption of acall in progress.The CTM service can be composed by "core service features" and "optional service features". The core service featuresprovide a basic service, available to all CTM users.The optional service features contain functionality that is additional to the core service features, that customize theservice according to the needs of a specific service subscriber. These additional parts may be offered either to all theservice provider’s service subscribers, or to a group of service subscribers or even to a single service subscriber.In addition to core service features, a network can implement optional service features. The availability to roaming CTMusers of the optional features depends on the implementation of the optional features in other networks.5.1Core service featuresThe core service features are listed hereafter.5.1.1NumberingThe CTM number can be a non-geographical number or a geographical number according to the operator’s choice.It may therefore be possible for a user subscribing to the CTM service to keep the user’s existing E.164 number as anetwork option.NOTE:When a user subscribes to the CTM service using the user’s existing E.164 number as the CTM number,calls to the served user’s E.164 number may be routed either to the served user’s cordless terminal or tothe served user’s fixed terminal according to the operator’s choice.SIST EN 301 175 V1.1.1:2003

ETSIEN 301 175 V1.1.1 (1998-08)115.1.2Outgoing callThis service feature enables a CTM user to originate calls from the cordless terminal irrespective of its location in thecoverage area.The network may verify that the CTM user is permitted to place the call as requested.5.1.3Emergency callThis service feature enables a user to make an emergency call, i.e. a fast and easy means of giving information (at leastthe user’s registered location) about an emergency situation to the appropriate emergency organization (e.g. fire service,police and ambulance).NOTE:In some networks users may need to first register their location.5.1.4Incoming callThis service feature enables a CTM user to have incoming calls delivered to the cordless terminal irrespective of itslocation in the coverage area. The CTM user holds a CTM number that has to be used to reach the cordless terminalassociated to this CTM number, wherever it is located, within the coverage area.If the network is unable to complete an incoming call, the network shall send an appropriate notification to the callinguser.5.1.5RoamingThis service feature enables a CTM user without a call in progress to move within the coverage area. Therefore, thenetwork shall enable the roaming CTM user to register its current location. The deregistration of the CTM user’sprevious location shall also be performed. The extent to which roaming is permitted, may depend on the CTM user’ssubscription.As an option, roaming can be provided to and from the CTM user’s own residential area.As a network operator/service provider option, a CTM user can roam to and from another CTM user¢ residential areawith that user agreement.NOTE 1:In the user own residential area it is a network operator/service provider option to provide alternative oradditional services. The provision of these services is out of the scope of the present document.NOTE 2:Roaming within and between networks supporting CTM requires that all networks maintain access rightsinformation relating to each service provider with whom a roaming agreement exists.5.1.6HandoverThis service feature enables a CTM user to move with the cordless terminal with a call in progress within a networkwhere continuous radio coverage is provided and the cordless terminal has appropriate access rights.Handover from one network to another is outside the scope of phase 1 of the CTM service. In addition, within a networkthere may be limitations on handover. Consequently, calls may be terminated in these cases.5.1.7SecurityThis service feature enables the CTM user (and the network) to be protected from different types of misuse due to theCTM service. Different type of security mechanisms may be used to protect from:-fraudulent use;-fraudulent access;-eavesdropping;SIST EN 301 175 V1.1.1:2003

ETSIEN 301 175 V1.1.1 (1998-08)12-malicious behaviour.Access network security mechanisms shall be provided by using terminal authentication, network authentication andencryption subject to the limitations of the appropriate cordless access standards.Different service providers may offer different levels of security mechanisms to its subscribers.5.1.7.1Terminal authenticationTerminal authentication is a security mechanism by which the network verifies that the identity provided by the terminalis the one claimed.The purpose of this authentication security feature is to protect the network against unauthorized use. It enables also theprotection of the service subscriber by denying the possibility for intruders to impersonate authorized CTM users.The authentication of the terminal may be invoked by the network in various cases e.g. when the service subscriberrequests for:-access a service (including some or all of: originating or terminating CTM call, activation or deactivation of afeature/supplementary service); or-a change of service subscriber related information (including some or all of: location handling, registration orerasure of a feature/supplementary service).5.1.7.2Network authenticationNetwork authentication is a security mechanism by which a cordless terminal verifies that the identity provided by thenetwork is the one claimed.The purpose of this authentication security feature is to protect the cordless terminal from unauthorized access.5.1.7.3EncryptionEncryption is a security mechanism by which the user and signalling information is encrypted over the air interface.The purpose of the encryption feature is to protect the user and signalling information from eavesdropping.5.1.8Service profileThis service feature enables the CTM user to be provided with the CTM service according to subscription parameters asdetermined by the service provider. For that purpose, a service profile (e.g. containing the information needed for acorrect call handling) shall be maintained for the CTM user.5.2Optional service featuresSome possible optional service features are listed hereafter, but the service provider may offer other additional servicefeatures.5.2.1Service profile modificationThis service feature enables the CTM user to modify some data in the CTM user’s service profile. The CTM user maynot have access to all the data in the user’s service profile.NOTE:The service profile modification may take place from another terminal than the served user’s cordlessterminal, e.g. by using Dual Tone Multi Frequency (DTMF) signalling.5.2.2Service profile interrogationThis service feature enables the CTM user to perform interrogation of some data in the CTM user’s service profile. TheCTM user may not have access to all the data in the user’s service profile.SIST EN 301 175 V1.1.1:2003

ETSIEN 301 175 V1.1.1 (1998-08)13NOTE:The service profile interrogation may take place from another terminal than the served user’s cordlessterminal, e.g. using DTMF signalling.6ProceduresFrom the CTM user’s perspective, the procedures of ETS 300 111 [2], ETS 300 109 [3] and ETS 300 110 [4], asappropriate for the required basic service, shall apply for the calls using the CTM service. This clause contains theadditional procedures for the support of cordless terminals. The procedures specified in this clause are applicable for theserved user’s cordless terminal.6.1Provision and withdrawalThe CTM service shall be provided after prior arrangement with the service provider. The service subscriber and theservice provider have a contractual relationship and agree upon the service details, e.g. the coverage area could be a partof the contract. The service provider and the involved network operators make arrangements for service provision by thenetwork(s).The CTM service to the CTM user shall be provided by prior arrangement between the service provider and the networkoperator(s). The network shall be able to maintain a service profile for the CTM service subscriber. A service profileshall be created for the CTM user.The CTM service shall be withdrawn from a specific user upon request of the service subscriber or for service providerreasons.6.2Normal procedures6.2.1Registration, deregistration and erasure6.2.1.1Core requirementsBefore the CTM user receives access rights to the service, its cordless terminal has to be made known to the networkand certain identities and other specific information shall be exchanged between network and terminal by means of on-air procedures. This process of obtaining access rights is called service registration. This procedure is used by thecordless terminal to gain access to the network to enable calls to be made and received.Access rights for a cordless terminal shall be terminated by following a service deregistration procedure.Service registration and deregistration are administrative procedures controlled by the service provider.The network shall support procedures for service registration and de-registration. If service registration or de-registration is performed then this shall be valid throughout the area of service provision, i.e. a roaming CTM user shallnot be required to perform new service registrations while roaming between networks.6.2.1.2Optional requirementsAccess rights can be terminated by means of on-air procedures.The CTM user can register and erase data in the user’s service profile by means of procedures. As a network option itcould be possible to give the CTM user knowledge of some or all the data in the user’s service profile. It is a serviceprovider option to define the limit of restriction for the registration and erasure procedures.The network shall respond with the requested information to the CTM user if knowledge is allowed.SIST EN 301 175 V1.1.1:2003

ETSIEN 301 175 V1.1.1 (1998-08)146.2.2Activation and deactivation6.2.2.1Core requirementsThe CTM service to a user shall be activated when that user makes its location known to the network (locationregistration). This may occur for new subscriptions. Location registration shall cause the network to register the user atthe current location area.6.2.2.2Optional requirementsNot applicable.6.2.3Invocation and operation6.2.3.1Core requirementsRoamingFor each CTM user, information shall be maintained relating to the location of the CTM user within the network.Location registration shall be invoked to register a CTM user’s current location area when the location area has changed.Location registration shall cause the network to register the CTM user at the current location area. The locationinformation at the previously visited location shall be deleted. When the procedures are completed, the locationregistration shall be confirmed to the CTM user.NOTE:As a result of a location registration the network may assign a temporary identity to the CTM user.AuthenticationAt any time a CTM user is registered in the network, authentication may be invoked. Authentication may be invoked byboth the CTM user and the network. Upon invocation by the network, the network sends specific information(challenge) to the CTM user and awaits a response. The response from the CTM user to the network may either indicatesuccess or failure or contain sufficient information to the network to determine the result. If the result is not the expectedresponse, the network may take any action as appropriate. Upon invocation of authentication by the CTM user, the CTMuser sends specific information (challenge) to the network and awaits a response. The response from the network to theCTM user may either indicate a success or a failure or contain sufficient information to the CTM user to determine theresult. If the result is not the expected response, the CTM user may take any action as appropriate. The scope of networkauthentication is limited to security aspects related to service registration/de-registration.EncryptionIn order to protect the CTM user and signalling information from eavesdropping encryption on the air interface shall beinvoked.Outgoing callIf the CTM user originates a call, the network shall verify that the CTM user is registered in the network, and if so, setthe originating number to the complete CTM number, if applicable. The network shall then make the CTM user’sservice profile available in order to check the relevant CTM subscribed feature, with further call establishment followingnormal basic call procedures.When a user originates a call the network shall be cap
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