WPCL 2BJ|x    6'6'   x|@  Fascicle VI.1 Rec. Q.81 .s  x|@  Fascicle VI.1 Rec. Q.81 s Recommendation Q.81 ? NUMBER IDENTIFICATION SUPPLEMENTARY SERVICES ă U Q Contents ă 1.Direct Dialling In (DDI) 2.Multiple subscriber number (under study) 3.Calling Line Identification Presentation (CLIP) 4.Calling Line Identification Restriction (CLIR) 5.Connected Line Identification Presentation (COLP) 6.Connected Line Identification Restriction (COLR) 7.Malicious call identification (under study) T* R* * Recommendation Q.81 ?NUMBER IDENTIFICATION SUPPLEMENTARY SERVICES 1  Direct Dialling In (DDI) 1.1wDefinition  Direct Dialling In (DDI) enables a user to call directly another user on a ISPBX or other private system without attendant intervention. 1.2wDescription 1.2.1 wGeneral description  A part of the ISDN number, which is significant to the user, is passed to the user. This supplementary service is based on the use of the ISDN number and does not include subaddressing.  wNoteĩ A similar method to select a terminal on a passive bus is described in the Stage 1 description of the supplementary service MSN. wNoteĩ The caller may or may not find the ISDN number in the public directory.  Recommendation E.164 provides the flexibility for administrations to use national numbering plans of fixed or variable number lengths. This flexibility also applies to DDI numbers, i.e. even within a given PABX DDInumbers of different lengths may appear.  The number of digits used by a PABX supporting the DDI feature is not necessarily known by their serving local exchange nor by any other entity of the public network.  The DDI number (fixed or variable length) is sent enbloc or by overlap sending from the exchange to the PABX or other private system which finally and automatically establishes a connection to the destination without the assistance of an operator. 1.2.2 wQualifications on the applicability to Telecommunication Services No restrictions. 1.3wDerivation of a functional model(Step 1) 1.3.1 wFunctional model description Two functional models are used to show the different requirements ofDDI.  Functional model 1 represents the situation where DDI is used to address a terminal on a single ISPBX connected to the public network.  Functional model 2 describes the situation where DDI is used to address a terminal within a private network consisting of several PBXs.  Although functional model 1 can be seen as a special application of model 2 it is preferred to describe the two models independently to show different situations more clearly. NFIGURE 11/Q.81 U G Two functional models for DDI ă U 1.3.2 wDescription of the functional entities FE1: Call control agent of the calling user FE2: Call control entity of the calling user FE3: DDI Access control to the private network (located in the public network)  FE4: DDI Service control for the called user and access control in the private network FE5: Call control agent of the called user FE6: DDI Access control in the private network FE7: DDI Service control in the private network for the called user. 1.3.3 wRelationship to basic service  The call setup procedures in the public network are mainly the same as for the basic service.  FE1 and FE2 therefore have the same functionality as CCA and CC. r1 andr2 correspond to r1 and r2 in the basic service. FE3 includes specific functionality of DDI in the relationship r3.  FE4, FE6 and FE7 are entities in a private network that are only specified here as far as they are influenced by r3. The same applies for r4 and r5. 1.4wInformation flow diagrams (Step 2) 1.4.1 wDiagrams The diagrams for model 1 are shown in Figure 12/Q.81.  F2ԌNInsert diagram 1.4.1.1 wDiagrams for model 2 NInsert diagram  Notes   2a) Optional signalling information which may be used to acknowledge seizure and/or for B channel negotiation.   2b) Optional signalling information which may be used to indicate complete address information.   2c) If not already sent, this signalling information may be sent to the originating user to indicate complete address information.   2d) If the PABX recognizes the receipt of complete address information, this signalling information may be sent.   2e) On receipt of complete address information, this signalling information may be generated by the subPABX. If already sent by the PABX, it will not be transferred to the originating user.  3) Instead of ALTERTING, a CONNECT signalling information may be sent directly in case of an automatically responding terminal. 4) Optional early switch through of backward transmission path.  1.4.2 wDefinitions  The definitions for ACK, ADDRESS INFO, PROCEEDING, REPORT and SETUP are the same as for the basic service. 1.4.2.1.1 Meaning of [PROGRESS]  PROGRESS can be sent from the entity serving the called user to indicate that sufficient ADDRESS INFO was received to address a user terminal or access line. It is an unconfirmed information flow. 1.4.2.2.1 Information content of [PROGRESS]  Bchannel information in r3 if not yet included in a previous sent information element. 1.5wSDL diagrams of functional entities (Step 3)  SDL diagrams are provided for FE3 covering the aspects of both functional models and giving the relation between r2 and r3. FE1 and FE2 are, as said, already covered by the basic procedures so that all aspects of DDI, that are relevant for the public network, are covered in these diagrams.  In the SDL diagrams only those procedures are described that deviate from the basic procedures.  wNote 1ĩ Through connection is generally only done when the setup confirmation is received from the called user. This is described in option A.  In specific national applications through connection may already be done in an earlier point in time. This is covered in options B1 or B2 and requires further considerations.  wNote 2ĩ Negotiation of a B channel is not necessarily an independent information flow. It can be combined with the first backward information flow that is required for call control. This information flow can be PROGRESS, REPORT (alerting) or SETUP. 1.6wFunctional entity actions (Step 4) 1.6.1 wSpecific actions in FE3 1.6.1.1 Channel selection  Negotiation for the selection of a Bchannel will be permitted between the network and the PABX. The selection procedure is as follows: a) in the SETUP Request, the network will indicate one of the following:  1) channel is indicated, no acceptable alternative; or  2) channel is indicated, any alternative is acceptable; or  3) any channel is acceptable.  b) In cases 1) and 2), if the indicated channel is acceptable and available, the PABX selects it for the call.   In case 2), if the PABX cannot grant the indicated channel, it selects any other available B channel and identifies that channel in the first information sent in response to the SETUP Indication.   In case 3), the PABX selects any available Bchannel and identifies that channel in the first information sent in response to the SETUP Indication.  c) If no channel identification information element is present in the first response, the B channel indicated in the SETUP Request will be assumed.   If the Bchannel indicated in the first response is unacceptable to the network, it will clear the call.  d) When a Bchannel has been selected by the PABX that channel may be connected by the PABX.  e) In case 1), if the indicated Bchannel is not available, or in cases 2), 3), if no Bchannel is available and the PABX cannot proceed with the offered call, the PABX clears the call.  The preferred solution for Bchannel selection is alternative 1): Bchannel is selected by exchange B. 1.6.1.2 Through connection  The general time for through connection in FE3 is, when setup is confirmed by the called user. This prevents fraudulent use of the connection without charging.  As a consequence of this procedure all tones and announcements during call setup have to be generated in the public network.  3Ԍ As an alternative some network providers may allow for an early through connection. 1.6.2 wSpecific actions in FE6 and FE7 1.6.2.1 Through connection  In case of an ISDN terminal or subPABX connected to the PABX, the through connection of the B channel in the PABX is done with the sending of SETUP to the terminal/subPABX. In the subPABX the through connection is done with the sending of SETUP to the terminal. In the terminal the through connection is done at the receipt of CONNECT ACKNOWLEDGE from the PABX/subPABX.  In case of an analogue terminal connected to the ISDN PABX/subPABX the through connection of the Bchannel in the terminal is done with the sending of CONNECT to the ISDN PABX/subPABX. In the ISDN PABX/subPABX the through connection is done at the receipt of SETUP Confirmation from the terminal. Note that this case is for further study. 1.7wAllocation of functional entities to physical locations  The mapping between functional entities and their possible physical locations is given in the following matrix.   X(xX$ x|@      H(  Functional entities         H(  Scenario  FE1  FE2  FE3  FE4  FE5  FE6  FE7  H( H(  Call to ISPBX  TE  LE  LE  NT2  TE    H( H(  Call to private network  TE  LE  LE   TE  NT2  NT2  H(     2 X Multiple subscriber number XUnder study. 3 X Calling Line Identification Presentation (CLIP)  3.1XwGeneral  XCalling line identification presentation (CLIP) is a supplementary service offered to the called party which provides the calling party's ISDN number, possibly with subaddress information, to the called party. 3.2XwDescription XX3.2.1wGeneral description  XWhen CLIP is applicable and activated, the network provides the called party with the number of the calling party at call setup on all incoming calls. XThe calling party number may be accompanied by a subaddress.  XThe network should be capable of transmitting at least 15digits (maximum length of an ISDN number). In addition, if provided by the calling party, the network should be capable of transmitting a subaddress. The length of the subaddress is defined in the relevant Recommendation.  XThe network to which the calling party belongs should attempt to ensure that enough digits are transmitted to enable the called party to return the call, based on the calling number presented. XX3.2.2wSpecific terminology XNone identified. XX3.2.3wQualifications on the applicability to telecommunication services XThis supplementary service is applicable to all telecommunication services.  XIt is to be noted that in the Telematic services, an exchange of terminal identification (TID) occurs at a higher layer subsequent to a successful call establishment.  XFor Telematic services this supplementary service shall consist only of the access number of the calling party and this shall be provided by the network. For other nonvoice services this supplementary service is for further study. The presentation of the CLI by Telematic terminals and by other nonvoice terminals is for further study. 3.3XwDerivation of a functional model  XThis part of the description is common with the service calling line identification restriction since this service has some impact on calling line identification presentation.  XThe model used for illustrating the calling line identification services procedures is given below: PUser A P6User B X(xP H` "H1` 2 3!/4  `  HPFE 1 FE 2 FE 3H'FE 4+P6FE 5 Call Call CallH'Call+P6Call Control Control Control H'Control.P6Control Agent Functions Functions"H'Functions0P6Agent Functions  H''P6Functions CCA CC CCH'CC)P6CCA  X(x 3.4XwInformation flow diagrams  XThe calling line identity information needed to provide the calling line identification services is normally carried in the messages used to establish the call.  XThe calling line identity will be delivered to the called party by his local exchange and/or ISPBX during the call establishment if the calling line identity is available and presentation is allowed.  XIf calling line identity is not available in the destination local or transit exchange at call request, the exchange may optionally request the calling line identity from the originating local exchange.  XThe specifications of functions for Calling Line Identification include adaptions for private network implementations (in a full private network environment) and mobile network implementations. Private Network/Public ISDN interworking situations are for further study. XThe calling line identity is made up of a number of information units: XX©the subscriber's national (ISDN) number, or Xprivate network (ISDN) number, or  XX©international ISDN number and possibly other indications only for international calls, or XX©partial number (optional) (Note 2);  XX©optionally, subaddress information, if explicitly provided by the calling user; XX©numbering plan identification; XX©type of address. 3ƌ  XIn addition to the calling identity the subscriber may be given the following information: XX©Presentation indicator (PI) showing: XXhh( a) x!presentation allowed, or XXhh( b) x!presentation restricted, or XXhh( c) x!number not available due to interworking (Note 1) XX©Screening indicator (SI) showing: XXhh( XXa) x!user provided, verified and passed, or XXhh( XXb) x!network provided  XwNote 1ĩ The technical solutions for the various interworking arrangements with dedicated networks have not been detailed in this document.  XwNote 2ĩ For international calls the partial number may be the international prefix and the country code. For national calls the partial number may be the trunk prefix and the area code.  *In case of a national call this setup is sent to a national trunk exchange or LEB; FE3 is not needed. NFIGURE 61/Q.81 U 9 Calling line identification presentation (CLIP) Stage 2 ă 5 Information flows for combined public and private configurations ă MFIGURE 62/Q.81 9 Calling line identification presentation (CLIP) Stage 2 ă U N Private network ă BXwNote 1ĩ The information flow contains: XX©no information (should not be permitted for DDIISPBX in some networks); XX©part of the subscriber number (extension number, selection on a passive bus); XX©subscriber number; XX©national number indicators; Xinternational number (for mobile application); XX©numbering plan identification; XX©type of address; XX©presentation indicator (optional). Optional: subaddress. XwNote 2ĩ The information flow contains: XX©national number; XX©if present: subaddress; XX©international number;  XX©presentation indicator (allowed/restricted/not available due to interworking);  XX©screening indicator (network provided/subscriber provided, verified and passed); XX©type of address; XX©numbering plan identification. XwNote 3ĩ The information flow contains: XX©international number; 3ƌ XX©no information (e.g. presentation restriction) XX©if present: subaddress;  XX©presentation indicator (allowed/restricted/not available due to interworking);  XX©screening indicator (network provided/subscriber provided, verified and passed); XX©type of address; XX©numbering plan identification. XwNote 4ĩ The information flow contains: XX©no information; XX©national number (for national calls); XX©international number (for international calls); XX©if present: subaddress;  XX©presentation indicator (allowed/restricted/not available due to interworking);  XX©screening indicator (network provided/subscriber provided, verified and passed); XX©type of address; XX©numbering plan identification. XwNote 5ĩ The information flow contains: XX©no information; XX©part of the extension number (e.g. selection on a passive bus); XX©extension number or private network number; XX©optional: subaddress; XX©type of address; XX©numbering plan identification. XwNote 6ĩ The information flow contains: XX©extension number or private network number; XX©if present: subaddress;  XX©presentation indicator (allowed/restricted/not available due to interworking);  XX©screening indicator (network provided/subscriber provided, verified and passed); XX©type of address; XX©numbering plan identification. 3.5XwSDL diagrams for functional entities X FE 2 Determination of the calling line identity originating side  XThe ability of an ISDN component to determine the calling line identity and if present, the sub address. In public network the calling line identity is the national ISDN number, in private network the private network number and in mobile network the international ISDN number. X FE 3 Determination of the international calling line identity  XThe ability of an ISDN component to determine the international calling line identity and if present, the subaddress. X FE 4 Determination of the calling line identity destination side  XThe ability of an ISDN component to determine the calling line identity and if present, the sub address. In some networks the calling line identity given to an extension user connected to an ISPBX shall include outgoing prefix if the call is originated or passed through the public network. NFIGURE 63/Q.81 U S FE2  3Ԍ CL = Calling line PI = Presentation indicator SI = Screening indicator IFIGURE 64/Q.81 (2 of 2) U S FE3 CL = Calling line PI = Presentation indicator SI = Screening indicator NFIGURE 65/Q.81 X Notes to Table  XwNoteAĩNo information about the identity of the calling party is sent to the called party.  XwNoteBĩSet PI Presentation restricted, address information will not be presented to the called party.  XwNote1ĩPresentation may be restricted due to national regulations or presentation restriction.  XPresentation restriction may be overridden due to the called party's category (e.g. police).  XwNote2ĩThe request option is not supported by private networks (CL identity is always included). The request option is not defined by Study Group XVIII.  XwNote3ĩIn the case where the address information is not available due to interworking, only the indicators are presented to the user.  3Ԍ3.6XwFunctional entity actions XX3.6.1wFunctional entity actions for FE 2 XX©Check if calling line identity is provided from the user; XX©verify (and complete) calling line identity; XX©set PI and SI; XX©set type of number. XX3.6.2wFunctional entity actions for FE 3 XX©Check if calling line identity may be passed between administrations; XX©at the originating side: provide international number; XX©at the destination side: add international prefix. XX3.6.3wFunctional entity actions for FE 4 XX©Check CLIP subscription; XX©check if calling line identity is provided from FE3; XX©request the calling line identity (optional); Xcheck for CLIR and if presentation is allowed pass CLI to FE5. 3.7XwAllocation of functional entities to physical location   X*   X0  Functional       X7  entity FE 1 FE 2 FE 3 FE 4 FE 5  X+ Scenario       X* X+        X4 National call TE LE  LE TE  X* X9 International call TE LE TR LE TE  X* X7 Call between NT2s NT2 LE (TR) LE NT2  X* X4 Call between NT2 TE NT2  LE (TR) LE TE  X* X6 National private network TE NT2  NT2 TE  X* X0 International private network TE NT2 TR/NT2 NT2 TE  X*      XwNote (TR) means that this functional entity is included in the case of international calls. 4 X Calling Line Identification Restriction (CLIR) U 4.1XwGeneral  XCalling line identification restriction (CLIR) is a supplementary service offered to the calling party to restrict presentation of the calling party's ISDN number and subaddress to the called party. 4.2XwDescription XX4.2.1wGeneral description  XWhen CLIR is applicable and activated the originating node provides the destination node with a notification that the calling party's ISDN number and any subaddress information is not allowed to be presented to the called party. In this case no calling party number is included in the call offering to the called party's installation.  XwNote When CLIR is subscribed to, some network providers may not wish to send the originating identity of the calling customer to other network providers. XCalling line identification restriction includes two options: XXhXi)( presentation restriction for all calls; XXhXii)( temporary presentation restriction.  XThe presentation indicator is included in the SETUP req. ind. Information Flow received from the calling user. When no indicator is present a default value is used as follows.  XThe presentation indicator is stored in the public network (local exchange) as a default value for each user. The default value may be "presentation allowed" or "presentation restricted". This default value may be changedonlyby the network provider. XThe first option is considered a minimum implementation.  XThe second option gives the calling user a possibility on a per call basis to override the default presentation indicator value stored in the public network. This option may be available on a subscription basis or generally. XX4.2.2wSpecific terminology XNone identified. XX4.2.3wQualifications on the applicability to telecommunication services  XNone identified; i.e., this supplementary service is applicable to all telecommunication services.  XThe service calling line identification restriction has impact on the service calling line identification presentation, and therefore, the rest of the description is common for the two services. This part is presented in the CLIP description. 5 X Connected Line Identification Presentation (COLP) 5.1.wGeneral  XConnected Line Identification Presentation (COLP) is a supplementary service offered to the calling party which provides the connected party's ISDNnumber to the calling party. 5.2XwDescription 5.2.1wGeneral description  XWhen COLP is applicable and activated, the network provides the calling party with the number of the connected party when the called party responds positively to the incoming call. The network should be capable of transmitting at least 15 digits (maximum length of an ISDN number). 5.2.2wSpecific terminology XNone identified. 5.2.3wQualifications on the applicability to telecommunication services XThis supplementary service is applicable to all telecommunication services.  XIt is to be noted that in the Telematic services, an exchange of Terminal Identification (TID) occurs at a higher layer subsequent to a successful call establishment.  XFor Telematic services, this supplementary service shall consist only of the access number of the connected party and this shall be provided by the network. For other nonvoice services, this supplementary service is for further study. The presentation of the COLI by Telematic terminals and by other nonvoice terminals is for further study. 5.3XwDerivation of a functional model  3Ԍ XThis part of the description is common with the service Connected Line Identification Restriction (COLR) since this service has some impact on Connected Line Identification Presentation.  XThe model used for illustrating the "Connected Line Identification Services" procedures is given in Figure 51/Q.81 below. NFIGURE 51/Q.81 U < Model for Connected Line Identification Services 5.4XwInformation flow diagrams  XThe Connected Line Identity information needed to provide the Connected Line Identification Services is normally carried in the messages indicating that the call has been answered.  XThe original Connected Line Identity will be delivered to the calling party by his local exchange and/or ISPBX when the call enters the active state if the Connected Line Identity is available and presentation is allowed.  XIf Connected Line Identity is not available in the originating local or transit exchange at call connection time, the exchange may optionally request the Connected Line Identity from the destination local exchange.  XThe specifications of functions for COLP include adaptions for private network applications (in a full private network environment) and mobile network applications. Private Network/Public ISDN interworking situations are for further study. XThe Connected Line Identity is made up of a number of information units: Xthe subscriber's national (ISDN) number, or Xprivate network number, or  Xinternational ISDNnumber and possibly other indications only for international calls, or Xpartial number (optional) (Note 2);  Xoptionally, subaddress information, if explicitly provided by the calling user; Xnumbering plan identification; Xtype of address.  XIn addition to the Connected Line Identity, the subscriber may be given the following information: XPresentation Indicator showing: Xa) x!presentation allowed, or Xb) x!presentation restricted, or Xc) x!number not available due to interworking (Note 1); XScreening Indicator showing: Xa) x!User provided, verified and passed, or Xb) x!network provided.  XwNote 1ĩ The technical solutions for the various interworking arrangements with dedicated networks have not been detailed in this Recommendation.  XwNote 2ĩ For international calls, the partial number may be the international prefix and the country code. For national calls, the partial number may be the trunk prefix and the area code. In case of a national call, the FE3 is not needed. NFIGURE 52/Q.81 U 5 Information flows for combined public and private configurations ă NFIGURE 53/Q.81 U ; Information flows for private network configurations ă U XwNote 1ĩ The information flow contains: Xno information (should not be permitted for DDIISPBX in some networks); Xpart of the subscriber number (extension number, selection on a passive bus); Xsubscriber number; Xnational number; Xinternational number (for mobile applications); Xnumbering plan identification; Xtype of address; Xpresentation indicator; Xoptional: subaddress. XwNote 2ĩ The information flow contains: X( national number; 3Ԍ Xif present: subaddress; Xinternational number;  Xpresentation indicator (allowed/restricted/not available due to interworking);  Xscreening indicator (network provided/subscriber provided, verified and passed); Xtype of address; Xnumbering plan identification. XwNote 3ĩ The information flow contains: Xinternational number; Xno information (e.g., presentation restriction); Xif present: subaddress;  Xpresentation indicator (allowed/restricted/not available due to interworking); Xscreening indicator (network provided/subscriber provided); Xtype of address; Xnumbering plan identification. XwNote 4ĩ The information flow contains: Xno information (depending on indicators); Xnational number (for national calls); Xinternational number (for international calls); Xif present: subaddress;  Xpresentation indicator (allowed/restricted/not available due to interworking);  Xscreening indicator (network provided/subscriber provided, verified and passed); Xtype of address; Xnumbering plan identification. XwNote 5ĩ The information flow contains: Xno information; Xpart of the extension number (e.g., selection on a passive bus); Xextension number or private network number; Xoptional: subaddress; Xtype of address; Xnumbering plan identification. XwNote 6ĩ The information flow contains: Xextension number or private network number; Xif present: subaddress;  Xpresentation indicator (allowed/restricted/not available due to interworking);  XXhXX ( screening indicator (private network provided/user provided, verified and passed); Xtype of address; Xnumbering plan identification. 5.5XwSDL diagrams for functional entities X FE4 Determination of the Connected Line Identity Destination side  XThe ability of an ISDN component to determine the Connected Line Identity and if present, the subaddress. The Connected Line Identity may contain prefixes. In public network, the Connected Line Identity is the national ISDN Number, in private network the private Network Number and in mobile network the International ISDN Number. X FE3 Determination of the International Connected Line Identity  XThe ability of an ISDN component to determine the International Connected Line Identity and if present, the subaddress. X FE2 Determination of the Connected Line Identity Originating side  XThe ability of an ISDN component to determine the Connected Line Identity and if present, the subaddress. In some networks, the Connected Line Identity sent to an extension connected to an ISPBX shall contain the outgoing prefix. NFIGURE 54/Q.81 U ; FE4 Determination of the connected line identity ă M destination side ă IFIGURE 56/Q.81 (1 of 2) U < FE3 Determination of the international connected ă O line identity ă IFIGURE 56/Q.81 (2 of 2) U < FE3 Determination of the international connected ă O line identity ă NFIGURE 57/Q.81 U A FE2 Determination of the connected line ă H identity originating side ă 5.6XwFunctional entity actions 5.6.1wFunctional entity actions for FE2 XCheck COLP subscription; Xcheck if Connected Line is provided; Xrequest Connected Line Identify (optional); Xcheck for COLR and if presentation allowed, pass COLI to FE1. 5.6.2wFunctional entity actions for FE3 XCheck if Connected Line Identity may be passed between administrations;  3 ԌXat the destination side: provide international number; Xat the originating side: add international prefix. 5.6.3wFunctional entity actions for FE4 XCheck if Connected Line Identity is provided from the user; Xverify (and complete) Connected Line Identity; Xset PI and SI; Xset type of number. 5.7XwAllocation of functional entities to physical location   X)   X)  Functional Entity  FE 1  FE 2  FE 3  FE 4  FE 5  X)        X)  Scenario       X) X)  National Call  TE  LE   LE  TE  X)        X)  International Call  TE  LE  TR  LE  TE  X)        X)  Call between NT2s  NT2  LE  (TR)  LE  NT2  X)        X)  Call between NT2 TE  NT2  LE  (TR)  LE  TE  X)        X)  National Private Network  TE  NT2   NT2  TE  X)        X)  International Private Network  TE  NT2  TR/NT2  NT2  TE  X)      XwNote (TR) means that this Functional Entity is included in the case of international calls. 6 X Connnected Line Identification Restriction (COLR) 6.1XwGeneral  XConnected Line Identification Restriction (COLR) is a supplementary service offered to the connected party to restrict presentation of the connected party's ISDN number to the calling party. 6.2XwDescription 6.2.1wGeneral description  XWhen COLR is applicable and activated, the destination node provides the originating node with a notification that the connected party's ISDN number is not allowed to be presented to the calling party. In this case no connected party number is included in the call connected information to the calling party's installation.  XwNote When COLR is subscribed to, some network providers may not wish to send the identity of the connected customer to other network providers. X Detailed descriptions of functions and information flows XConnected line identification restriction includes two options: XXhXXi)( presentation restriction for all calls; XXhXXii)( temporary presentation restriction.  XThe presentation indicator is included in the SETUP conf. resp. Information Flow received from the called user. When no indicator is present, then a default value is used as follows.  XThe presentation indicator is stored in the public network (local exchange) as a default value for each user. The default value may be "presentation allowed" or "presentation restricted". This default value may be changedonlyby the network provider. XThe first option is considered a minimum implementation.  XThe second option gives the user who receives (and accepts) the call, a possibility on a per call basis to override the default presentation indicator value stored in the public network. This option may be available on a subscription basis or generally.  XThe service connected line identification restriction has impact on the service connected line identification presentation, and therefore, the rest of the description is common for the two services. This part is presented in the COLP description. 6.2.2wSpecific terminology XNone identified. 6.2.3wQualifications on the applicability to telecommunications services  XNone identified; i.e., this supplementary service is applicable to all telecommunication services. 7 X Malicious call identification XUnder study. M