SIST EN 301 273 V1.1.3:2003
(Main)Cordless Terminal Mobility (CTM); Phase 2; Service description
General Information
- Abstract
To produce an ETSI stage 1 description for phase 2 of the CTM service
- 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
Overview
SIST EN 301 273 V1.1.3:2003 defines the stage 1 service description for Phase 2 of Cordless Terminal Mobility (CTM), focusing on the user and subscriber perspective. Developed by the Slovenski inštitut za standardizacijo (SIST), in parallel with the European Telecommunications Standards Institute (ETSI), this standard outlines the core and optional service features of the CTM service in fixed public and private telecommunication networks. The document is primarily intended for network operators, service providers, and manufacturers of telecommunications equipment who support the Digital Enhanced Cordless Telecommunications (DECT) platform.
Cordless Terminal Mobility enables users of cordless terminals to move freely within and between network coverage areas, maintaining ongoing communication sessions and supporting various value-added features. The standard covers scenarios involving the pan-European Integrated Services Digital Network (ISDN) and Public Switched Telephone Network (PSTN), detailing key functional elements, mobility capabilities, security, and interworking requirements.
Key Topics
CTM Service Features
- Core Features: Provide baseline functionality such as numbering, outgoing/incoming calls, emergency calls, roaming, handover, and security.
- Optional Features: Include service profile modification/interrogation and various supplementary services (e.g., call forwarding, call barring).
Mobility Management
- Supports user mobility within and between coverage areas of fixed networks.
- Enables movement during active calls (handover) and location registration for call establishment.
- Roaming facilitates user connectivity across public and private CTM-enabled networks.
Security Measures
- Implementation of terminal and network authentication to prevent unauthorized use and fraudulent activity.
- Encryption mechanisms to protect signaling and user information over radio interfaces.
Supplementary Services
- Call forwarding (on busy, no reply, unconditional, not reachable)
- Calling/Connected Line Identification (presentation and restriction)
- Incoming call screening and outgoing call barring
Interworking
- Defines requirements for seamless operation when users are on different CTM networks or when integrating with private networks (PISN) and non-CTM networks.
- Specifies interactions with ISDN supplementary services and compatibility with other value-added telecommunication offerings.
Applications
The practical applications of SIST EN 301 273 V1.1.3:2003 are broad, supporting a range of telecommunication environments where flexible user mobility is critical. Core use cases include:
- Business Campuses: Enabling employees to move across offices or buildings while remaining connected via cordless terminals.
- Healthcare Facilities: Supporting staff mobility for efficient communication and quick response during emergencies.
- Hospitality and Retail: Enhancing customer service by empowering staff with portable communication devices.
- Residential Complexes: Offering residents the convenience to place or receive calls anywhere within the property’s radio coverage area.
The standard's robust mobility, security, and supplementary service capabilities also make it suitable for integration into intelligent network (IN) environments, maximizing service flexibility and scalability for operators.
Related Standards
For comprehensive implementations, the following standards are referenced or provide complementary specifications:
- ETS 300 109: ISDN circuit-mode 64kbit/s 8kHz structured bearer service description
- ETS 300 110: ISDN 3.1kHz audio bearer service description
- ETS 300 111: ISDN 3.1kHz telephony service description
- ETS 300 824: DECT CTM Access Profile (CAP) - defines terminal capabilities foundational to CTM
- ITU-T Recommendation E.164: International public telecommunications numbering plan
- ETS 300 345: ISDN interworking between public and private integrated networks
By aligning with these related standards, operators and manufacturers can ensure full interoperability and adherence to European telecommunication industry practices.
Keywords: cordless terminal mobility, CTM, DECT, telecommunications standards, user mobility, ISDN, PSTN, security, supplementary services, roaming, call forwarding, numbering, authentication, standardization.
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Frequently Asked Questions
SIST EN 301 273 V1.1.3:2003 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Cordless Terminal Mobility (CTM); Phase 2; Service description". This standard covers: To produce an ETSI stage 1 description for phase 2 of the CTM service
To produce an ETSI stage 1 description for phase 2 of the CTM service
SIST EN 301 273 V1.1.3:2003 is classified under the following ICS (International Classification for Standards) categories: 33.050.01 - Telecommunication terminal equipment in general; 33.070.30 - Digital Enhanced Cordless Telecommunications (DECT). The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 301 273 V1.1.3:2003 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)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.HCordless Terminal Mobility (CTM); Phase 2; 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 301 273 Version 1.1.3SIST EN 301 273 V1.1.3:2003en01-december-2003SIST EN 301 273 V1.1.3:2003SLOVENSKI
STANDARD
ETSIEN301273V1.1.3(2000-01)EuropeanStandard(Telecommunicationsseries)CordlessTerminalMobility(CTM);Phase2;ServicedescriptionSIST EN 301 273 V1.1.3:2003
ETSIETSIEN301273V1.1.3(2000-01)2ReferenceDEN/NA-020061KeywordsCTM,DECT,mobility,stage1ETSIPostaladdressF-06921SophiaAntipolisCedex-FRANCEOfficeaddress650RoutedesLucioles-SophiaAntipolisValbonne-FRANCETel.:+33492944200Fax:+33493654716SiretN°34862356200017-NAF742CAssociationàbutnonlucratifenregistréeàlaSous-PréfecturedeGrasse(06)N°7803/88Internetsecretariat@etsi.frIndividualcopiesofthisETSIdeliverablecanbedownloadedfromhttp://www.etsi.orgIfyoufinderrorsinthepresentdocument,sendyourcommentto:editor@etsi.frImportantnoticeThisETSIdeliverablemaybemadeavailableinmorethanoneelectronicversionorinprint.Inanycaseofexistingorperceiveddifferenceincontentsbetweensuchversions,thereferenceversionisthePortableDocumentFormat(PDF).Incaseofdispute,thereferenceshallbetheprintingonETSIprintersofthePDFversionkeptonaspecificnetworkdrivewithinETSISecretariat.CopyrightNotificationNopartmaybereproducedexceptasauthorizedbywrittenpermission.Thecopyrightandtheforegoingrestrictionextendtoreproductioninallmedia.©EuropeanTelecommunicationsStandardsInstitute2000.Allrightsreserved.SIST EN 301 273 V1.1.3:2003
ETSIETSIEN301273V1.1.3(2000-01)3ContentsIntellectualPropertyRights.5Foreword.51Scope.62References.73Definitions.74Abbreviations.95Description.95.1Coreservicefeatures.105.1.1Numbering.105.1.2Outgoingcall.105.1.3Emergencycall.105.1.4Incomingcall.105.1.5Roaming.105.1.6Handover.115.1.7Security.115.1.7.1Terminalauthentication.115.1.7.2Networkauthentication.115.1.7.3Encryption.115.1.8Serviceprofile.125.1.9Messagewaitingindication.125.2Optionalservicefeatures.125.2.1Serviceprofilemodification.125.2.2Serviceprofileinterrogation.125.3CTMsupplementaryservices.125.3.1CTMcallforwardingonnotreachable.125.3.2CTMcallforwardingunconditional.125.3.3CTMcallforwardingonbusy.135.3.4CTMcallforwardingonnoreply.135.3.5CTMcallinglineidentificationpresentation.135.3.6CTMcallinglineidentificationrestriction.135.3.7CTMconnectedlineidentificationpresentation.135.3.8CTMconnectedlineidentificationrestriction.135.3.9CTMincomingcallscreening.135.3.10CTMoutgoingcallbarring.136Procedures.136.1Provisionandwithdrawal.136.2Normalprocedures.146.2.1Registration,deregistrationanderasure.146.2.1.1Corerequirements.146.2.1.2Optionalrequirements.146.2.2Activationanddeactivation.146.2.2.1Corerequirements.146.2.2.2Optionalrequirements.146.2.3Invocationandoperation.156.2.3.1Corerequirements.156.2.3.2Optionalrequirements.166.2.4Interrogation.166.2.4.1Corerequirements.166.2.4.2Optionalrequirements.166.3Exceptionalprocedures.166.3.1Registrationanderasure.166.3.1.1Corerequirements.16SIST EN 301 273 V1.1.3:2003
ETSIETSIEN301273V1.1.3(2000-01)46.3.1.2Optionalrequirements.166.3.2Activationanddeactivation.166.3.2.1Corerequirements.166.3.2.2Optionalrequirements.176.3.3Invocationandoperation.176.3.3.1Corerequirements.176.3.3.2Optionalrequirements.176.3.4Interrogation.186.3.4.1Corerequirements.186.3.4.2Optionalrequirements.187Interworkingrequirements.187.1InterworkingbetweenpublicnetworksprovidingtheCTMservice.187.1.1PublicCTMuserroamsintoavisitedpublicnetwork.187.2Interworkingwithprivatenetworks.187.2.1PublicCTMuserroamsintoaPISNarea.197.2.2PrivateCTMuserroamsintoapublicCTMnetworkarea.197.3InterworkingwithnetworksnotprovidingtheCTMservice.197.4Co-operationbetweennetworkoperatorsandserviceproviders.198InteractionwithISDNsupplementaryservices.208.1Interactiondescription.208.1.1Adviceofchargeservices(AOC-S,AOC-D,AOC-E,AOC-R).208.1.2Callhold(HOLD).208.1.3Explicitcalltransfer.208.1.4Callinglineidentificationpresentation.208.1.5Callinglineidentificationrestriction.208.1.6Connectedlineidentificationpresentation.218.1.7Connectedlineidentificationrestriction.218.1.8Closedusergroup.218.1.9Completionofcallstobusysubscriber.218.1.10Completionofcallsonnoreply.218.1.11Conferencecall,add-on(CONF).218.1.12Callforwardingunconditional.218.1.13Callforwardingonbusy.218.1.14Callforwardingonnotreachable.228.1.15Selectivecallforwarding.228.1.16Callforwardingunconditionaltoaservicecentre.228.1.17Maliciouscallidentification.228.1.18Threeparty.228.1.19User-to-usersignalling.228.1.20In-callmodification.228.1.21Trunkhunting.228.1.22Fixedoutgoingcallbarring.228.1.23Usercontrolledoutgoingcallbarring.238.1.24Reversechargingatcallsetuptime.238.1.25Messagewaitingindication.238.1.26Othersupplementaryservices,otherservices.239Interactionwithotherservices.249.1Universalpersonaltelecommunication.24History.25SIST EN 301 273 V1.1.3:2003
ETSIETSIEN301273V1.1.3(2000-01)5IntellectualPropertyRightsIPRsessentialorpotentiallyessentialtothepresentdocumentmayhavebeendeclaredtoETSI.TheinformationpertainingtotheseessentialIPRs,ifany,ispubliclyavailableforETSImembersandnon-members,andcanbefoundinSR000314:"IntellectualPropertyRights(IPRs);Essential,orpotentiallyEssential,IPRsnotifiedtoETSIinrespectofETSIstandards",whichisavailablefromtheETSISecretariat.LatestupdatesareavailableontheETSIWebserver(http://www.etsi.org/ipr).PursuanttotheETSIIPRPolicy,noinvestigation,includingIPRsearches,hasbeencarriedoutbyETSI.NoguaranteecanbegivenastotheexistenceofotherIPRsnotreferencedinSR000314(ortheupdatesontheETSIWebserver)whichare,ormaybe,ormaybecome,essentialtothepresentdocument.ForewordThisEuropeanStandard(Telecommunicationsseries)hasbeenproducedbyETSITechnicalCommitteeNetworkAspects(NA).InaccordancewithCCITTRecommendationI.130[7],thefirststageofthefollowingthreelevelstructureisusedtodescribethetelecommunicationsservicesasprovidedbyEuropeanpublictelecommunicationsoperators:-Stage1:isanoverallservicedescription,fromtheservicesubscriber'sanduser'sstandpoint;-Stage2:identifiesthefunctionalcapabilitiesandinformationflowsneededtosupporttheservicedescribedinstage1;and-Stage3:definesthesignallingsystemprotocolsandswitchingfunctionsneededtoimplementtheservicedescribedinstage1.Thepresentdocumentdetailsthestage1aspects(overallservicedescription)fortheCTMservice,takingintoaccountthevariousnetworkarchitectures,e.g.,IN.Theapplicationofstage2andstage3maybedifferentwhentheserviceissupportedonanINenvironment.NOTE:CTMphase2servicedescriptionimprovesphase1withenhancementsintheareaofmobility(handover,messagewaitingindication).Moreoveritdefinesacomprehensivesupportforemergencycallcorefeature.CTMphase2definesalsoCTMspecificsupplementaryservices.RegardingterminalcapabilitiesthepresentdocumentformsthebasisfortheDECTCTMAccessProfile(CAP)ETS300824[5].NationaltranspositiondatesDateofadoptionofthisEN:31December1999DateoflatestannouncementofthisEN(doa):31March2000DateoflatestpublicationofnewNationalStandardorendorsementofthisEN(dop/e):30September2000DateofwithdrawalofanyconflictingNationalStandard(dow):30September2000SIST EN 301 273 V1.1.3:2003
ETSIETSIEN301273V1.1.3(2000-01)61ScopeThepresentdocumentdefinesthestage1servicedescriptionforphase2oftheCTMservice.Stage1isanoverallservicedescription,primarilyfromtheservicesubscriber'sanduser'spointofview,butdoesnotdealwiththedetailsofthehumaninterfaceitself.Thepresentdocumentincludesinformationapplicabletonetworkoperatorsandterminal,switchanddatabasemanufacturers.ThepresentdocumentspecifiestherequirementswheretheserviceisprovidedtotheCTMuserviaatelecommunicationsnetworkthatiseitherthepan-EuropeanISDNoraPSTNasprovidedbyEuropeanpublictelecommunicationsoperators.Thepresentdocumentincludesinterworkingrequirementsforcaseswhereusersinacallarelocatedondifferentnetworks.TheprovisionoftheCTMserviceonmobilenetworksisoutsidethescopeofthepresentdocument.Thepresentdocumentcontainsthecorerequirementsforphase2oftheCTM.Aservicemaybeprovidedonthebasisofthesecorerequirementsalone.Thepresentdocumentalsodocumentssomeoptionalservicefeatureswhichmaybeusedtoenhancetheservice.Furthermore,additionalfunctionalitiesnotdocumentedinthepresentdocumentmaybeimplemented.Therequirementsofwhichareconsideredoutsideofthescopeofthepresentdocumentandconsequentlyoutsidethescopeofthecorrespondingstage2andstage3standards.Suchadditionalfunctionalitymaybeonanetwork-widebasis,orparticulartooneCTMuseroragroupofCTMusers.Suchadditionalfunctionalitydoesnotcompromiseconformancetothecorerequirementsoftheservice.Chargingprinciplesareoutsidethescopeofthepresentdocument,unlessspecificservicerequirementsarestated.TheserequirementsdealwiththeallocationofcertaincallchargestoparticularCTMusers.InteractionswithservicesandISDNsupplementaryservicesnotlistedinclauses8and9areoutsidethescopeofthepresentdocument.TheCTMserviceallowsusersofcordlessterminalstobemobilewithinandbetweennetworks.WhereradiocoverageisprovidedandthecordlessterminalhasappropriateaccessrightstheCTMuserisabletomakecallsfrom,andtoreceivecallsat,anylocationwithinthefixedpublicand/orprivatenetworks,andmaymovewithoutinterruptionofacallinprogress.Phase2oftheCTMserviceisapplicabletothetelephony3,1kHzteleservice(seeETS300111[3]).Phase2oftheCTMserviceisalsoapplicabletothespeechbearerservice(seeETS300109[1])andthe3,1kHzaudiobearerservice(seeETS300110[2]).Ifthepresentdocumentisapplicabletothestage2andstage3standardsforthephase2oftheCTMservice,wherethetextindicatesthestatusofarequirement(i.e.asstrictcommandorprohibition,asauthorizationleavingfreedom,asacapabilityorapossibility),thisshallbereflectedintherelevantstage2andstage3standards.Otherwise,thestatusofarequirementshallbereflectedintherelevantstandardsfortheunderlyingprotocols.Furthermore,conformancetothepresentdocumentiseithermetby:-conformingtothestage3standards;or-implicitlycoveredbyconformingtothestandardsfortheunderlyingprotocols,withthefieldofapplicationappropriatetotheequipmentbeingimplemented.Thereforenomethodoftestingisprovidedforthepresentdocument.SIST EN 301 273 V1.1.3:2003
ETSIETSIEN301273V1.1.3(2000-01)72ReferencesThefollowingdocumentscontainprovisionswhich,throughreferenceinthistext,constituteprovisionsofthepresentdocument.•Referencesareeitherspecific(identifiedbydateofpublication,editionnumber,versionnumber,etc.)ornon-specific.•Foraspecificreference,subsequentrevisionsdonotapply.•Foranon-specificreference,subsequentrevisionsdoapply.•Anon-specificreferencetoanETSshallalsobetakentorefertolaterversionspublishedasanENwiththesamenumber.[1]ETS300109(1992):"IntegratedServicesDigitalNetwork(ISDN);Circuit-mode64kbit/s8kHzstructuredbearerservicecategoryusableforspeechinformationtransfer,Servicedescription".[2]ETS300110(1992):"IntegratedServicesDigitalNetwork(ISDN);Circuit-mode64kbit/s8kHzstructuredbearerservicecategoryusablefor3,1kHzaudioinformationtransfer,Servicedescription".[3]ETS300111(1992):"IntegratedServicesDigitalNetwork(ISDN);Telephony3,1kHzteleservice,Servicedescription".[4]ETS300345(1994):"IntegratedServicesDigitalNetwork(ISDN);InterworkingbetweenpublicISDNsandprivateISDNsfortheprovisionoftelecommunicationservices;Generalaspects".[5]ETS300824:"DigitalEnhancedCordlessTelecommunications(DECT);CordlessTerminalMobility(CTM);CTMAccessProfile(CAP)".[6]ITU-TRecommendationE.164(1997):"Theinternationalpublictelecommunicationnumberingplan".[7]CCITTRecommendationI.130(1988):"MethodforthecharacterizationoftelecommunicationservicessupportedbyanISDNandnetworkcapabilitiesofanISDN".3DefinitionsForthepurposeofthepresentdocument,thefollowingtermsanddefinitionsapply:authentication:securitymechanismallowingtheverificationoftheprovidedidentityaccessrights:indicationthatthecordlessterminalhasappropriateaccessallowancetotheCTMserviceNOTE1:Thisdefinitiondoesnotrefertoanyspecificaccesstechnology.accessrightsidentity:identitywhichisgloballyuniquetoaserviceproviderandwhichshowstheaccessrightsrelatedtothisserviceproviderbasiccall(procedures):proceduresbywhichacall(asaninstanceofabasictelecommunicationservice)isestablishedandterminatedNOTE2:Emergencycallisnotabasiccall.cordlessterminal:physicalentitythatprovidesaccesstothetelecommunicationservicesofanetworkviaaradiointerfacecoreservicefeature:particularservicefeaturefundamentaltothetelecommunicationservice,i.e.,intheabsenceofthisservicefeature,thetelecommunicationservicedoesnotmakesenseasacommercialofferingtotheservicesubscribercoveragearea:areawithintheradiocoverageareainwhichtheCTMuserhassubscribedtousetheCTMserviceSIST EN 301 273 V1.1.3:2003
ETSIETSIEN301273V1.1.3(2000-01)8CTMidentity:identitybywhichaCTMuserisknowntotheCTMserviceprovidersandnetworkssupportingCTM,anditisusedforflexibilityandsecuritypurposes.TheCTMidentityidentifiesaCTMuserunambiguously.TheCTMidentitydoesnotneedtobeknownbyusersCTMnumber:numberthatuniquelyandunambiguouslyidentifieseachCTMuser.ItisusedbyacallingpartytoreachtheCTMuser.Thenumberisindependentofthecallingterminal,networkorserviceusedanditisaE.164numberE.164number:numberconformingtothenumberingplanandstructurespecifiedinITU-TRecommendationE.164[6]forwarded-tonumber:numbertowhichthecallisredirectedasaresultofcallforwardinghandover:processbywhichacallinprogressismaintainedwhentheCTMusermoveswiththecordlessterminalwithacallinprogresswithinanetworkwherecontinuousradiocoverageisprovidedlocationarea:radiocoverageareainwhichacordlessterminalmayreceivecallsasaresultofasinglelocationregistrationlocationregistration:processwherebythepositionofaCTMterminalisdeterminedtothelevelofonelocationareanetworkoperator:entitythatprovidesthenetworkoperatingelementsandresourcesfortheexecutionoftheCTMservicenotreachable:statusinthenetworkwhenanincomingcallisofferedtoacordlessterminalbutthecordlessterminalisoutofradiocoverage,switchedofforthereisradiocongestionoptionalservicefeature:servicefeatureaddedtocorefeaturetooptionallyenhanceaserviceofferingradiocoverage:areainwhichcordlessterminalsmaybeusedtoestablishandmaintaintelecommunicationservicesviatheradiobasestationssupportedbythenetworksupportingtheCTMserviceNOTE3:TheradiocoveragesupportedbyanindividualnetworksupportingtheCTMservicemaybecontinuousordiscontinuous,i.e.itmaycorrespondtothecompletegeographicalterritoryservedbythenetworkoritmaynot.Inthecaseofdiscontinuousradiocoverage,theareasofradiocoveragemayconsistofindividualradiocells,servingforexampleisolatedhousesorverysmallbusinesses,orcordlessislandsconsistingofacollectionofradiocellsprovidingcontinuouscoverageoflargerareas.TheradiocoveragesupportedbyanetworksupportingtheCTMservicemayoverlapwiththeradiocoveragesupportedbyoneormoreothernetworkssupportingtheCTMserviceoritmaybecomplementary.roaming:CTMusermoveswiththecordlessterminalwithoutacallinprogressfromonelocationareatoanotherlocationareawithinthesameand/orbetweendifferentnetworkssupportingtheCTMserviceservicefeature:specificaspectofatelecommunicationservicethatcanalsobeusedinconjunctionwithothertelecommunicationservicesorservicefeaturesaspartofacommercialoffering.Itiseitheracorepartofatelecommunicationserviceoranoptionalpartofferedasanenhancementtoatelecommunicationserviceserviceprofile:recordcontainingalltheserviceinformationrelatedtoaCTMuserserviceprovider:actorwhoprovidesCTMservicestoitsservicesubscribersonacontractualbasisandwhoisresponsiblefortheCTMservicesoffered.Thesameorganizationmayactasanetworkoperatorandaserviceproviderservicesubscriber:entitythatcontractsforservicesofferedbyserviceprovidersservice:thatwhichisofferedbyanadministrationorapublicorprivateserviceprovidertoitsservicesubscriberinordertosatisfyatelecommunicationrequirementterminalmobility:abilityofaterminaltoaccesstelecommunicationservices,whileinmotion,andthecapabilityofthenetworktolocateandidentifythatterminalasitmovesuser:personormachinedelegatedbyaservicesubscribertousetheservicesand/orfacilitiesofatelecommunicationnetworkSIST EN 301 273 V1.1.3:2003
ETSIETSIEN301273V1.1.3(2000-01)94AbbreviationsForthepurposeofthepresentdocument,thefollowingabbreviationsapply:CAPCTMAccessProfileCCBSCompletionofCallstoBusySubscriberCCNRCompletionofCallsonNoReplyCFBCallForwardingonBusyCFNRCallForwardingonNoReplyCFNRcCallForwardingonNotReachableCFUCallForwardingUnconditionalCLIPCallingLineIdentificationPresentationCLIRCallingLineIdentificationRestrictionCOLPConnectedLineIdentificationPresentationCOLRConnectedLineIdentificationRestrictionCT2SecondgenerationofCordlessTechnologyCTMCordlessTerminalMobilityCUGClosedUserGroupDECTDigitalEnhancedCordlessTelecommunicationsICSIncomingCallScreeningIMIn-callModificationINIntelligentNetworkISDNIntegratedServicesDigitalNetworkOCBOutgoingCallBarringPISNPrivateIntegratedServicesNetworkPSTNPublicSwitchedTelephoneNetworkREV-SREVersechargingatcallSetuptimeUPTUniversalPersonalTelecommunicationUUSUser-to-UserSignalling5DescriptionTheCTMserviceallowsusersofcordlessterminalstobemobilewithinandbetweennetworks.Whereradiocoverageisprovidedandthecordlessterminalhasappropriateaccessrightst
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