Abstract:
A method and system for routing incoming communications in a communications network are provided. The network comprises a plurality of network elements. An addressable number is associated with a plurality of communications devices each identified by a unique identifier. A communication addressed to a communications device is received at a network element, the communication comprising the addressable number. A subscriber service profile associated with the addressable number is retrieved at a discrete network element, where an appropriate communications device for delivery of the incoming communication based on pre-established criteria in the subscriber service profile is determined. An identifier of the appropriate communications device is forwarded from the discrete network element to the network element. The communication is transmitted to the appropriate communications device. The subscriber service profile comprises preferences for delivery of communications, and a list of communications devices that are at least one of active and registered.

Description:
PRIORITY CLAIM 
       [0001]    The present application is a continuation of U.S. patent application Ser. No. 12/700,331, filed Feb. 4, 2010; which is a continuation of U.S. patent application Ser. No. 10/438,097, filed May 15, 2003, now U.S. Pat. No. 7,680,491, all of which are incorporated by reference herein. 
     
    
     TECHNICAL FIELD 
       [0002]    The present invention relates generally to telecommunication network implementations; and in particular to a method and system for routing incoming communications in a communications network. 
       BACKGROUND 
       [0003]    As a whole, the teachings of the prior demonstrate that it has largely been pre-occupied with other priorities within this niche. For instance, much art is devoted to varied apparatus for allowing one wireless phone to share two (or more) telephone numbers (or SIMs) or conversely for allowing one SIM card to be shared between two masters (as between a cellular radiotelephone and multi-mode satellite radiotelephone as detailed for instance in U.S. Pat. No. 6,141,564 to Bruner, et al. entitled method of sharing a SIM card between two masters). 
         [0004]    And similarly, other art has likewise been devoted to switching between multiple SIM cards within a wireless phone as to maximize time-of-day discounts (consider for instance European Patent Application 1098543 by Fragola, F.), or as to lower roaming costs (consider U.S. patent application Ser. No. 20020154632 by Wang, Yung-Feng et al.) and so forth. 
         [0005]    Other inventions, as UK Patent No. 2375261 to Hiltunen, M. entitled transfer of SIM data between mobile computing devices, are devoted to ‘acquiring’ the identification information contained within the SIM card of one mobile phone and transferring it to another, thereby creating a manner of ‘virtual’ SIM, thereby obviating for physically transferring SIM cards between wireless devices and the corresponding lag and down-time associated with such. 
         [0006]    Still further art as U.S. Pat. No. 6,466,804 to Pecen, et al. entitled method and apparatus for remote multiple access to subscriber identity module, details a method and apparatus for remote multiple access to services of a subscriber identity module (SIM) card by multiple subscriber devices in a GSM system. The crux of the subject matter delineated thereof deals with the scenario whereby multiple wireless devices use a single SIM. Whereas the invention of present seeking the protection of Letters Patent effectively enables multiple independent SIMs (e.g. with individual IMSIs) to appear as a single SIM for the purpose of providing telephony services via a macroscopic (GSM) carrier. 
         [0007]    Indeed, we submit that there remains nothing in the prior art which intimates or anticipates the particular network based solution presented herein. 
         [0000]    
       
         
               
             
               
               
               
               
             
               
             
               
               
               
             
           
               
                   
               
               
                 REFERENCES CITED 
               
               
                   
               
             
             
               
                 U.S. Patent Application 
               
             
          
           
               
                 20020154632 
                 October 2002 
                 Wang, et al. 
                 370/389 
               
               
                 U.S. Pat. No. 6,466,804 
                 October 2002 
                 Pecen, et al. 
                 455/558 
               
               
                 U.S. Pat. No. 6,141,564 
                 October 2000 
                 Bruner, et al. 
                 455/558 
               
             
          
           
               
                 Foreign Patent Document(s) 
               
             
          
           
               
                 2375261 
                 November 2002 
                 GB 
               
               
                 1098543 
                 May 2001 
                 EP 
               
               
                   
               
             
          
         
       
     
       OTHER REFERENCES  
       [0000]    
       
         GSM 03.40, Digital cellular telecommunications system (Phase 2+); Technical realization of the Short Message Service (SMS) 
         GSM 09.02, Mobile Application Part (MAP) specification 
         GSM 03.90, Digital cellular telecommunications system (Phase 2+); Unstructured Supplementary Service Data (USSD)-Stage 2 
       
     
       SUMMARY 
       [0011]    The method and system allowing for one mobile phone number (MSISDN) to be associated with a plurality of wireless devices (Multi-SIM) described herein provides the requisite art for a wireless subscriber to present/utilize one phone number (Mobile Station Integrated Services Digital Network (MSISDN) Number) across a plurality of wireless devices (and their inherent, requisite SIMs (Subscriber Identity Modules)). Effectively, the invention of present seeking the protection of Letters Patent enables multiple independent SIMs (e.g. with individual IMSIs (International Mobile Station Identifiers)) to utilize the same phone number (MSISDN) for the purpose of providing telephony services via a macroscopic (GSM) carrier. The collective effect of the invention with respect to the telecommunication services which can be offered via a plurality of wireless devices will be characterized as the ‘Multi-SIM’ service. 
         [0012]    The art has been articulated such that, even across a multiplicity of wireless devices, when originating a telecommunication, a common phone number (MSISDN) is always displayed. 
         [0013]    The mobile subscriber in question may choose which wireless device (and its associated SIM) s/he wishes to receive telecommunications upon in the preferred embodiment. In particular, various non-limiting manifestations of the invention may optionally direct Voice, SMS (Short Message Services), MMS (Multi-Media Message Services), MWI (Message Waiting Indicator) services towards different wireless devices and their associated SIMs. Optional manifestations of the invention limits the number of simultaneous telecommunications activity which emanate from the plurality of devices associated with the Multi-SIM service. Further optional manifestations of the invention permits the automated redirection of telecommunications services (e.g. call delivery and location retrieval) based on a pre-configured settings or the detection of activity from the plurality of wireless device or active polling to determine the status of the plurality of wireless devices. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0014]      FIG. 1  illustrates a typical, non-limiting embodiment of the system level architecture employed in the disclosure of present; 
           [0015]      FIG. 1A  details a non-limiting call-flow of the subscriber registration sequence for mobile originated voice telecommunications of the method and system allowing for one mobile phone number (MSISDN) to be associated with a plurality of wireless devices. 
           [0016]      FIG. 1B  represents a non-limiting call-flow detailing the means through which mobile terminating SMS or MMS traffic is managed by the method and system allowing for one mobile phone number (MSISDN) to be associated with a plurality of wireless devices. 
           [0017]      FIG. 1C  represents a non-limiting call-flow detailing the means through which the location of a mobile station may be retrieved. 
           [0018]      FIG. 1D  represents a non-limiting call-flow detailing the means through which an indication of the unsuccessful nature of a SMS delivery attempt will be relayed to a SMS-C.  FIG. 1D  also represents a non-limiting call-flow detailing the means through which the unavailability of a given mobile station may be provided to a given SMSC for subsequent SMS delivery attempts. 
           [0019]      FIG. 1E  represents a non-limiting call-flow detailing the means through which an indication of availability (for the purpose of receiving Short Messages) may be relayed to a SMS-C. 
           [0020]      FIG. 1F  represents a non-limiting call-flow detailing the means through which unstructured supplementary service (USSD) message handling is accommodated. 
           [0021]      FIG. 1G  represents a non-limiting call-flow detailing the means through which supplementary service message handling is accommodated. 
           [0022]      FIG. 1H  represents a non-limiting call-flow detailing the means through which call delivery to a wireless device is accommodated. 
       
    
    
     DETAILED DESCRIPTION 
       [0023]    In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular embodiments, elements, interfaces, hardware configurations, data structures, software flows, techniques, etc. in order to provide a thorough understanding of the present invention. However, it will be apparent to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well known methods, devices, and elements are omitted so as not to obscure the description of the present invention with unnecessary detail. 
         [0024]    With reference to  FIG. 1 , the essential logic  70 B for the method and system allowing for one mobile phone number (MSISDN) to be associated with a plurality of wireless devices (‘Multi-SIM’)  70 , provides the core Mobile Application Part (MAP) intercept function  70  A establishing devices against the Multi-SIM Mobile Station Integrated Services Digital Network (MSISDN) in the network such that outgoing traffic is seen to originate from the Multi-SIM MSISDN. The Multi-SIM computer program product  70  also intercepts incoming traffic to the Multi-SIM MSISDN and directs it to the nominated primary device ( 1 A,  1 B,  1 C as applicable) for that traffic type. Practitioners and other honorable members skilled in the art will recognize that the primary device need not be bound to one (1) of three (3) selections and may exceed such limitations to the state of the art. 
         [0025]    A non-limiting, illustrative list of such MAP messages which will ordinarily be encountered by the Multi-SIM method and system include the messages, including the various parametric attributes, as prescribed in the GSM TS 09.02, ETSI TS 100 974, and 3GPP TS 29.002 Mobile Application Part (MAP) specifications as amended from time to time. 
         [0026]    Wireless subscribers who obtain the high-level service delineated herein from their respective telecommunications carriers and/or network operators will have a defined number of devices ( 1 A,  1 B,  1 C and so forth); each device is provisioned in the HLR (Home Location Register)  50  and in the Multi-SIM database  70 C. An individual MSISDN is associated with each device ( 1 A,  1 B,  1 C) in the HLR  50  but is not used outside of the HLR  50  and Multi-SIM inventions  70 . 
         [0027]      FIGS. 1A ,  1 B,  1 C,  1 D,  1 E,  1 F,  1 G, and  1 H have been included as variants of  FIG. 1  to ease and facilitate the instruction of the art, and should be interpreted as aiding and helping to achieve such ends. The labels of  FIG. 1  are therefore incorporated by reference. 
         [0028]    With reference now to  FIG. 1A , the mobile and/or wireless device ( 1 A,  1 B,  1 C) (among others and as applicable), is activated (‘turned on’). After a given wireless device completes any programmed self-check procedure, it will initiate the registration sequence via the applicable air-interface as well as the serving MSCNLR  30 A per steps  100 A. The serving MSCNLR  30 A, as per the usual operational processes of a GSM network, normally forwards the MAP Update Location message to the HLR  50  associated with the IMSI‘x’ of the mobile device&#39;s SIM. For the purpose of the disclosed invention, the MAP Update Location message will instead be forwarded to the Multi-SIM invention  70  at step IOOB. Those skilled in the art shall recognize that there are a variety of mechanisms by which the MAP Update Location message can be forwarded to the Multi-SIM invention  70  using the inherent capabilities of the SS7 (Signaling System 7) network and the associated translation capabilities of the serving MSC/VLR  30 A. Those skilled in the art will recognize that the Multi-SIM invention  70  will appear as a defacto HLR for IMSI‘x’ from the perspective of the serving MSCNLR  30 A. 
         [0029]    After receiving the MAP Update Location message, the Multi-SIM invention  70  will store the addressing information of the MSC/VLR  30 A associated with IMSI‘x’. The Multi-SIM invention will also retrieve the address of the HLR  50  associated with IMSI‘x’ and forward the MAP Update Location message to the appropriate HLR  50  via the SS7 network at step  100 C. An optional manifestation of the Multi-SIM invention  70  will initiate a MAP version negotiation sequence (not shown) as described in GSM 09.02 (and similar specifications) if the MAP version number of the received message at step IOOB is greater than that currently supported by the HLR  50  associated with IMSI‘x’. Those skilled in the art will recognize that there are a number of well understood message sequences associated with the MAP version negotiation procedure and that the intent of such a such a procedure is to ensure that subsequent messages received from network elements such as the serving MSC/VLR  30 A are set to a MAP version level no higher than the MAP version level supported by the HLR  50  associated with IMSI‘x’. The MTP (Message Transfer Part) and SCCP (Signaling Connection Control Part) of the MAP Update Location message forwarded to the HLR  50  at step IOOC will be modified by the Multi-SIM invention  70  so that the Multi-SIM invention will appear as a VLR from the perspective of the HLR  50 . Those skilled in the art will recognize that the HLR  50  utilizes received VLR and MSC addressing information in the MAP layer of the Update Location message to invoke service screening criteria as defined by GSM specifications. For example, a VLR or MSC address associated with a given service provider&#39;s ‘home’ network may be accorded different service attributes relative to the VLR and MSC associated with a ‘foreign’ network. To that end, an optional manifestation of the invention will map the VLR and MSC addressing information received in the MAP layer of the Update Location message to a predefined subset of alternative VLR and MSC addresses in order to invoke an appropriate set of service attributes for the subscribers associated with the Multi-SIM service. Those skilled in the art will recognize that for the aforementioned optional manifestation of the invention that the HLR  50  will have to be configured (typically via translation tables) to apply a specific set of service attributes given the predefined subset of alternative VLR and MSC addresses. 
         [0030]    Still in reference to  FIG. 1A , the HLR  50  will retrieve the subscriber&#39;s profile using IMSI‘x’ as the index key using established processes commonly implemented by HLR vendors. The subscriber&#39;s profile will include, among other subscribed service attributes, the MSISDN‘x’ associated with IMSI‘x’. The HLR  50  will in turn initiate a MAP Insert Subscriber Data sequence, containing the subscribed attributes associated with the subscriber&#39;s profile and MSISDN‘x’, which will be forwarded to the Multi-SIM invention  70  via the SS7 network at step IIOA. Those skilled in the art shall recognize that the HLR  50  will direct the MAP Insert Subscriber Data sequence to the Multi-SIM invention  70  via the SS7 network by virtue of the received MTP and SCCP addressing information received at step IOOC. 
         [0031]    Still in reference to  FIG. 1A , the MAP Insert Subscriber Data message is received from the HLR  50  by the art of the Multi-SIM invention  70  (specifically  70 A) at IIOA. Using said IMSI‘x’ as an index key, the Primary MSISDN is retrieved (not shown) from an internal database/table  70 C (via  70 B). An optional manifestation of the invention will store the status of the wireless device associated with IMSI‘x’ in the application memory or internal database  70 C for the purpose of applying optional routing procedures for outgoing and incoming as noted in a subsequent portion of this disclosure. Yet another optional manifestation of the invention will store selected attributes associated with Intelligent Network (IN) services in application memory or internal database  70 C. Those skilled in the art will recognize that there are a variety of IN services which are defined by various specifications which serve the similar purposes without diluting the intent and scope of the present invention including those associated with CAMEL (Customized Applications for Mobile Network Enhanced Logic) and CS-1 (Capability Set 1) as well as derivations thereof. 
         [0032]    Still in reference to  FIG. 1A , the Multi-SIM invention  70  will generate an MAP Insert Subscriber Data message where the MSISDN‘x’ received from the HLR  50  will be replaced by the Public MSISDN retrieved from the Multi-SIM internal database  70 C. The Multi-SIM invention  70  will forward the MAP Insert Subscriber Data message to the serving MSCNLR  30 A via the SS7 network at step IIOB. Those skilled in the art will recognize that a characteristic of the invention is that the MAP Insert Subscriber Data received by a MSCNLR  30 A always contains the Public MSISDN regardless of which IMSI‘x’ (and corresponding SIM and wireless device) was activated. 
         [0033]    Still in reference to  FIG. 1A , after the serving MSCNLR  30 A processes the information received via the MAP Insert Subscriber Data message received at step IIOB, the serving MSCNLR  30 A generates and forwards a MAP Insert Subscriber Data acknowledgement message to the Multi-SIM invention  70  at step  120 A. At step  120 B, the Multi-SIM invention  70  will forward a MAP Insert Subscriber Data acknowledgement message to the HLR  50  modifying the MTP, SCCP, TCAP, and MAP layers of the message relative to that received at step  120 A as required. For example, the Primary MSISDN will be replaced by MSISDN‘x’. The HLR  50  will receive the MAP Insert Subscriber Data message and generate an MAP Update Location acknowledgement message using established processes commonly implemented by HLR vendors. The HLR  50  will forward the MAP Update Location acknowledgement message to the Multi-SIM invention at step  130 A. The serving MSCNLR  30 A will receive the MAP Update Location acknowledgement message and initiate an appropriate confirmation message to the wireless device I‘x’ at step  130 B. At step  130 C, the serving MSCNLR will complete the registration sequence with the mobile station. 
         [0034]    Still in reference to  FIG. 1A , a mobile originated call may then be established at step  140 A. The MSCNLR  30 A will initiate a call to the intended destination address via the Public Switched Telephone Network (PSTN) using the procedures prescribed using the ISDN User Part (ISUP) protocol at step  140 B. A characteristic of the disclosed invention is that the Calling Party Number information associated with the call establishment procedure will be set to the primary MSISDN forwarded to the serving MSCNLR  30 A by the Multi-SIM invention  70  at step IIOB. 
         [0035]    Still in reference to  FIG. 1A , those skilled in the art will recognize that a similar sequence will be invoked for GPRS (General Packet Radio Service) registration scenarios. In particular, a characteristic of the disclosed invention is that the Primary MSISDN identifier will be associated with a given IMSI‘x’ for the PDP (Packet Data Protocol) Context Activation establishment procedure. 
         [0036]    Still in reference to  FIG. 1A , an optional manifestation of the Multi-SIM invention  70  may selectively screen outgoing call attempts by utilizing procedures associated with IN services. In particular, an IN message (e.g. CAMEL INITIAL_DP) originated from the serving MSCNLR  30 A will indicate a call attempt being made by a mobile station  1 A,  1 B,  1 C. The Multi-SIM invention  70  may invoke screening criteria based on the destination and source address information contained in the IN message. The Multi-SIM invention  70  may also invoke incremental screening criteria based on the state of a given mobile device (associated with IMSI‘x’) as stored in the Multi-SIM invention database  70 C (not shown). For example, the Multi-SIM invention  70  may use screening criteria to limit the number of simultaneous calls or to redirect calls to an alternative destination address. The Multi-SIM invention  70  will instruct the serving MSCNLR  30 A via an appropriate IN message (e.g. CAMEL CONTINUE or CAMEL CONNECT or CAMEL CANCEL) as to the appropriate course of action based on the screening criteria. Those skilled in the art will recognize that the optional manifestation of the Multi-SIM invention  70  will provide functionality commonly associated with a Service Control Point (SCP). Those skilled in the art will also recognize that there are a variety of IN protocols which are defined by various specifications which serve the similar purposes without diluting the intent and scope of the present invention including those associated with CAMEL and CS-1 (Capability Set 1) as well as derivations thereof. Another optional manifestation of the Multi-SIM invention  70  may act as an intermediation gateway between the serving MSCNLR  30 A and a given Service Control Point (not shown) for the purpose of ensuring the seamless support of IN services supported by the Service Control Point (not shown). 
         [0037]    Now with reference to  FIG. 1B , where the respective Short Message (SM) stored in SMS-C  40  remains to be delivered. Those skilled in the art will recognize that the Short Message may also consist of a Multi-Media or voice-mail alerting message. The SMS-C will generate and forward a MAP SEND-ROUTING-INFO-FOR-SM (SRI for SM) message which will be directed to the Multi-SIM invention. Those skilled in the art shall recognize that there are a variety of mechanisms by which the MAP SRI for SM message can be forwarded to the Multi-SIM invention  70  using the inherent capabilities of the SS7 network and the associated translation capabilities of the SMS-C  40 . Those skilled in the art will recognize that the Multi-SIM invention  70  will appear as a defacto HLR for a given Primary MSISDN from the perspective of the SMS-C  40 . 
         [0038]    Still in reference to  FIG. 1B , the Multi-SIM invention  70  will retrieve the subscriber&#39;s service profile using the Primary MSISDN as the index key from an internal database/table  70 C (not shown). The service profile will contain, among other attributes, information pertaining to the specific routing preferences for Short Message as well as Multi-Media Messages and Voice-Mail alerts as the case may be. The Multi-SIM invention will generate and forward a MAP SRI for SM response message to the SMS-C  40  at step  210 . The MAP SRI for SM response message will contain information so that the SMS-C will consider the Multi-SIM invention as the serving MSC for the purpose of Short Message delivery. For example, the Network Node Number parameter will contain an identifier which will uniquely identify the Multi-SIM invention as the serving MSC for the purpose of Short Message delivery. Those skilled in the art will recognize that the MAP SRI for SM response message at step  210  will contain other parameters so that the SMS-C will be able to continue processing the delivery of the Short Message. For example, the MAP SRI for SM message will contain an IMSI value which can be selected from the set of IMSI‘x’ associated with the Primary MSISDN or set to a configurable range of values. Those skilled in the art will recognize that the Multi-SIM invention  70  will appear as a defacto VLR from the perspective of the SMS-C  40 . 
         [0039]    Still in reference to  FIG. 1B , at step  220 , the SMS-C will attempt delivery of the message by generating and forwarding a MAP MT-FORWARD-SHORT-MESSAGE (MT FSM) message to the Multi-SIM invention  70 . At step  230 , the Multi-SIM invention will determine the appropriate mobile device (as identified by the IMSI‘x’ associated with a given SIM and mobile device respectively) to receive the Short Message based on a number of factors including the source address contained in the MT FSM message as well as the nature of the message (e.g. short message or alert). Note that the Multi-SIM invention  70  may use a variety of techniques in order to determine the appropriate mobile device based on either programmatic methods (for example, the last device that registered may be used to forward all short messages) or based on pre-established criteria as provided by the subscriber (for example, the subscriber may send Short Messages and alert messages to different devices based on the relative capabilities supported on each device). The programmatic methods may in turn be affected by the state of each device (e.g. whether a given mobile device is engaged in a call or registered). Those skilled in the art will recognize that a variety of techniques may be used in order to determine the destination mobile device without diluting the intent and scope of the present invention. A characteristic of the disclosed invention is that telecommunication services can be selectively terminated to the plurality of mobile devices based on a number of programmatic techniques as well as pre-configured routing criteria. 
         [0040]    Still in reference to  FIG. 1B , at step  230 , the Multi-SIM invention will generate and forward a MT FSM to the serving MSC/VLR  30 A associated with the IMSI‘x’ of the selected mobile station, modifying the MTP, SCCP, TCAP, and MAP layers of the message relative to that received at step  230  as required. Those skilled in the art will recognize that the Multi-SIM invention  70  will appear as a defacto SMS-C from the perspective of the serving MSC/VLR  30 A. At step  240 , the short message will be delivered to the mobile station  1 A,  1 B,  1 C (among others and as applicable) associated with IMSI‘x’. At step  250 , a MAP MT FSM response message containing an indication of the successful or unsuccessful nature of the delivery attempt will be initiated by the serving MSC/VLR  30 A and forwarded to the Multi-SIM invention  70 . At step  260 , the Multi-SIM invention  70  will generate and forward a MT FSM response to the appropriate SMS-C  40 , modifying the MTP, SCCP, TCAP, and MAP layers of the message relative to that received at step  250  as required. 
         [0041]    Now with reference to  FIG. 1C , a Location Client  80  will initiate a location retrieval request via an Application Programming Interface (API) at  300 A which will include a number of parameters including but not limited to the Primary MSISDN and a transaction identifier. In lieu of a Primary MSISDN, the Location Client may provide a pseudonym which can be correlated to the Primary MSISDN. The purpose of the transaction identifier being to uniquely correlate a given request with other messages which may be received asynchronously including, but not limited to, a confirmation response. Practitioners skilled in the art shall recognize that a variety of object oriented application programming interfaces (e.g. Common Object Request Broker Architecture (CORBA) or Extensible Markup Language (XML)) may be used. 
         [0042]    Still in reference to  FIG. 1C , at step  300 B, the Gateway Mobile Location Centre (GMLC)  81  will receive the location retrieval request. The GMLC  81  will initiate a MAP ANY-TIME-INTERROGATION (ATI) sequence to the Multi-SIM invention  70 . Those skilled in the art shall recognize that there are a variety of mechanisms by which the MAP ATI message can be forwarded to the Multi-SIM invention  70  using the inherent capabilities of the SS7 network and the associated translation capabilities of the GMLC  81 . Those skilled in the art will recognize that the Multi-SIM invention  70  will appear as a defacto HLR for IMSI‘x’ from the perspective of the GMLC  81 . Those skilled in the art will recognize that the functionality of the GMLC is generally defined by a variety of specifications including GSM 03.71 and 3GPP 23.071 as amended from time to time and that modifications to the capabilities of the GMLC as prescribed by the noted specifications does not dilute the intent and scope of the present invention. A characteristic of the disclosed invention is that the location of a given mobile terminal can be retrieved without sending messages to the HLR  50 . Those skilled in the art will recognize that the Multi-SIM invention  70  effectively emulates certain capabilities associated with the HLR for the purpose of retrieving the location associated with a mobile station. 
         [0043]    Still in reference to  FIG. 1C , at step  300 C, the Multi-SIM invention  70  will retrieve the subscriber&#39;s service profile using the Primary MSISDN as the index key from an internal database/table  70 C (not shown). The service profile will contain, among other attributes, information pertaining to the specific preferences for location retrieval, the last known location of the device based on previous location retrieval attempts, as well as the current list of active or registered devices (as identified via the IMSI‘x’ identifier associated with a given SIM and mobile device respectively). The Multi-SIM invention  70  will determine the appropriate mobile device (as identified by the IMSI‘x’ associated with a given SIM and mobile device) for the purpose of a location query based on a number of factors including the source address contained in the MAP ATI message. The Multi-SIM invention  70  may use a variety of techniques in order to determine the appropriate mobile device for the location query based on either programmatic methods (for example, the last device that registered) or based on pre-established criteria as provided by the subscriber (for example, the subscriber may rank order a number of devices to be located in preferential order). The programmatic methods may in turn be affected by the state of each device (e.g. whether a given mobile device is engaged in a call or registered). Those skilled in the art will recognize that a variety of techniques may be used in order to determine the mobile device for a location query without diluting the intent and scope of the present invention. The Multi-SIM invention  70  will initiate a MAP PROVIDE-SUBSCRIBER-Info (PSI) message towards the appropriate serving MSC/VLR  30 A based on the selected mobile station (which is associated with a given IMSI(x)) modifying the MTP, SCCP, TCAP, and MAP layers of the message relative to that received at step  300 B as required. Upon receipt of the MAP PSI message, the serving MSC/VLR  30 A will retrieve the location of the mobile station. The mechanisms of retrieving the location of the mobile station are generally prescribed by a variety of specifications including GSM 03.71 and 3GPP 23.071 as amended from time to time. 
         [0044]    Still in reference to  FIG. 1C , at step  310 A a MAP PSI response message will be initiated by the serving MSC/VLR  30 A which will contain the location of the mobile terminal. The MAP PSI response message will be forwarded to the Multi-SIM invention  70 . At step  310 B, the Multi-SIM invention  70  will generate and forward a MAP ATI response to the GMLC  81 , modifying the MTP, SCCP, TCAP, and MAP layers of the message relative to that received at step  310 A as required. An optional manifestation of the Multi-SIM invention  70  will store the location of mobile station (associated with IMSI‘x’) in the internal database/table  70 C (not shown). At step  310 C, the GMLC  81  will provide the location information to the Location Client  80  via the API. Those skilled in the art will recognize that an optional manifestation of the Multi-SIM invention  70  may abbreviate the location retrieval attempt by providing location information associated with previous location attempts. This will effectively result in steps  300 C and  310 A being bypassed. The retrieval and provision of stored location information is governed by programmatic control and there are a number of procedures and conditions (for example, time based methods) which may be applied to abbreviate the location retrieval process. 
         [0045]    Now with reference to  FIG. 1D , where a SMS delivery report associated with a SMS delivery attempt is to be forwarded to the appropriate SMS-C. At step  400 A, a MAP MT-FORWARD-SHORT-MESSAGE (MT FSM) response message containing an indication of the unsuccessful nature of the delivery attempt will be initiated by the serving MSC/VLR  30 A and forwarded to the Multi-SIM invention  70 . Those skilled in the art will recognize that the Multi-SIM invention  70  will appear as a defacto SMS-C from the perspective of the serving MSC/VLR  30 A based on the intermediation of registration and SMS delivery sequences previously described. At step  400 B, the Multi-SIM invention  70  will generate and forward a MT FSM response to the appropriate SMS-C  40 , modifying the MTP, SCCP, TCAP, and MAP layers of the message relative to that received at step  400 A as required. 
         [0046]    Still in reference to  FIG. 1D , at step  410 , the SMS-C  40 A will initiate a MAP REPORT-SM-DELIVERY-STATUS which will contain a number of parameters including the Primary MSISDN and Service Center address and which will be forwarded to the Multi-SIM invention  70 . Those skilled in the art will recognize that the Multi-SIM invention  70  will appear as a defacto HLR for a given Primary MSISDN from the perspective of the SMS-C  40 A. To that end, the Multi-SIM invention  70  will emulate the capabilities associated with a HLR  50  for the purpose of setting and maintaining the Message Waiting Data file for the Primary MSISDN. The Message Waiting Data file can be implemented via a variety of mechanisms without diluting the intent and scope of the present invention. For example, the Message Waiting Data file can be stored as a multi-element data element in the Multi-SIM database  70 C (as indexed by the Primary MSISDN). Those skilled in the art will recognize that the intent of the Message Waiting Data file in the HLR, among other functions, is to record the address of SMS-Cs for subsequent notification once a given mobile station is deemed active (registers). At step  420 A, the Multi-SIM invention  70  will initiate a MAP REPORT-SM-DELIVERY-STATUS response message to the SMS-C  40 A indicating that the SMS-Cs address has been stored. At step  420 B, the SMS-C  40 A may provide an indication of the unsuccessful delivery attempt to the Message Center  41 A. 
         [0047]    Still in reference to  FIG. 1D , at step  430 A, a Message Center  41 B may attempt to deliver a Short Message to the a given subscriber as identified by the Primary MSISDN. At step  430 B, the SMS-C  40 B will generate and forward a SRI for SM message which will be directed to the Multi-SIM invention  70 . Those skilled in the art shall recognize that there are a variety of mechanisms by which the MAP SRI for SM message can be forwarded to the Multi-SIM invention  70  using the inherent capabilities of the SS7 network and the associated translation capabilities of the SMS-C  40 . The Multi-SIM invention  70  will retrieve the subscriber&#39;s service profile and the Message Waiting Data file using the Primary MSISDN as the index key from an internal database/table  70 C (not shown). The service profile will contain, among other attributes, information pertaining to the specific routing preferences for Short Message as well as Multi-Media Messages and Voice-Mail alerts as the case may be. As the Message Waiting File will indicate that the mobile station is not active/registered, the Multi SIM platform  70  will generate and forward a MAP SRI for SM response message to the SMS-C  40 B at step  440  which will indicate that the subscriber is absent (typically by sending the User Error parameter to ‘Absent Subscriber_SM’). 
         [0048]    Still in reference to  FIG. 1D , at step  450 , the SMS-C  40 B will initiate a MAP REPORT-SM-DELIVERY-STATUS which will contain a number of parameters including the Primary MSISDN and Service Center address and which will be forwarded to the Multi SIM platform  70 . At step  460 , the Multi-SIM invention  70  will initiate a MAP REPORT-SM-DELIVERY-STATUS response message to the SMS-C  40 B indicating that the SMS-Cs address has been stored. 
         [0049]    Now with reference to  FIG. 1E , which illustrates the intercept of the MAP READY FOR SM operation generally used by the MSC/VLR  30 A if a subscriber, whose message waiting flag is active in the VLR, has re-established radio contact with the network or has memory available. At step  500 , the MSC/VLR  30 A generates MAP READY FOR SM message which is forwarded to the Multi-SIM invention  70 . Those skilled in the art will recognize that the Multi-SIM invention  70  will appear as a defacto HLR for a given IMSI‘x’ from the perspective of the MSC/VLR  30 A. The MAP READY FOR SM message will contain several parameters indicating if the mobile subscriber is present or if the mobile station has memory. At step  510 , the Multi-SIM invention will generate and forward a MAP READY FOR SM response message to the MSC/VLR  30 A indicating that the message at step  500  has been received and processed successfully. 
         [0050]    Still in reference to  FIG. 1E , the Multi-SIM invention  70  will retrieve the subscriber&#39;s service profile using the IMSI‘x’ as the index key from an internal database/table  70 C (not shown). The service profile will contain, among other attributes, information pertaining to the specific routing preferences for Short Message as well as Multi-Media Messages and Voice-Mail alerts as the case may be. The service profile will contain the Primary MSISDN associated with IMSI‘x’ which will in turn be used to index the Message Waiting Data elements. Based on the information retrieved, the Multi-SIM invention will determine which SMS-C should be contacted. Those skilled in the art will recognize that the Multi-SIM invention may use a variety of techniques in order to determine the appropriate SMS-C based on the information contained in the internal database/table  70 C (not shown). In particular, the Multi-SIM invention may determine that a SMS-C may not be contacted based on the routing preferences prescribed by the subscriber. Alternatively, the Multi-SIM invention may determine that several SMS-Cs (not shown) should be contacted. At step  520 A, the Multi-SIM invention will generate and forward a MAP ALERT-SERVICE-CENTRE (Alert SC) to the selected SMS-C  40 A (or SMS-Cs (not shown)) indicating that a given subscriber (as identified by the Primary MSISDN) is ready to receive Short Messages. At step  520 B, the SMS-C may alert Message Centers to the effect that a given subscriber may receive Short Messages. 
         [0051]    Still in reference to  FIG. 1E , at step  530 B, the SMS-C  40 A will generate and forward a MAP Alert SC response message to the Multi-SIM invention  70  indicating that the MAP Alert SC message was received and processed successfully. At this point in time, the SMS-C  40  may initiate the short message delivery mechanisms as described earlier in the text associated with  FIG. 1B . 
         [0052]    Still in reference to  FIG. 1E , those skilled in the art will recognize that other mechanisms including the registration process described in  FIG. 1A  may invoke the MAP Alert SC sequence described at step  520 A. 
         [0053]    Now with reference to  FIG. 1F , USSD MAP messages are typically routed to and from the USSD Application via the serving MSC/VLR and HLR using the methods, operations, and protocols specified in GSM 03.90 and GSM 09.02 as amended from time to time. An optional manifestation of the invention provides an USSD-based subscriber interface to change default routing preferences of Multi-SIM subscribers. The Multi-SIM invention will also permit subscribers and network operators to make configuration changes via a (web-based) provisioning interface. 
         [0054]    Still with reference to  FIG. 1F , at step  600 , a subscriber may invoke an Unstructured Supplementary Service Data (USSD) service by keying in a USSD short code (e.g. *XX#). This will invoke a USSD Message (e.g. MAP PROCESS_UNSTRUCTURED_SS_REQUEST (PUSSR)) which will be forwarded to the Multi-SIM invention  70  using the inherent capabilities of the SS7 network and the associated translation capabilities of the serving MSC/VLR  30 A. At step  610 , the Multi-SIM invention  70  may recognize that the USSD short code (as provided via the USSD String parameter) matches a prescribed code associated with the invocation of a feature of the Multi-SIM service. Example services include modifying the routing behavior of the Multi-SIM service for received voice or messaging traffic or obtaining information pertaining to the current settings of the Multi-SIM invention for the subscriber. At step  610 , the Multi-SIM invention initiates a MAP USSD response message. The MAP USSD response message may contain text which indicates that the requested feature was invoked successfully or requested information pertaining to the status of the Multi-SIM service. At step  610 , the MSC/VLR will relay the information to the mobile station per the processes described in GSM 03.90 and GSM 09.02. 
         [0055]    Still with reference to  FIG. 1F , at steps  620 A,  620 B,  630 , a USSD message which is not associated with a Multi-SIM service or feature is propagated to the USSD Based Application  90  via the Multi-SIM invention  70  and HLR  50 . At step  620 B, the Multi-SIM invention modifies the SCCP, TCAP, and MAP layers of the message relative to that received at step  620 A as required. Those skilled in the art will recognize that the Multi-SIM invention  70  will appear as a defacto HLR for IMSI‘x’ (or the Primary MSISDN) from the perspective of the MSC/VLR  30 —and that the Multi-SIM invention will appear as a defacto MSC/VLR for IMSI‘x’ (or MSISDN‘x’) from the perspective of the HLR  50 . At steps  630 ,  640 A,  640 B, an USSD response message initiated from the USSD Based Application  90  and is propagated to the serving MSC/VLR  30 A via the HLR  50  and Multi-SIM invention  70 . At step  640 B, the Multi-SIM invention modifies the SCCP, TCAP, and MAP layers of the message relative to that received at step  640 A as required. At step  640 B, the MSC/VLR will relay the information to the mobile station per the processes described in GSM 03.90 and GSM 09.02. 
         [0056]    Now with reference to  FIG. 1G , Supplementary services (e.g. call forwarding services) are typically modified (in order to activate, deactivate, register, erase, or check the status of supplementary services as the case may be) via MAP messages between the MSC and the VLR and between the VLR and the HLR using the methods, operations, and protocols specified in GSM 09.02 as amended from time to time. At step  700 , a subscriber may invoke a command via the Man Machine Interface (MMI) of his/her mobile terminal in order to modify a supplementary service. This will invoke a Supplementary Service MAP message (e.g. MAP ACTIVATE_SS) which will be forwarded to the Multi-SIM invention  70  using the inherent capabilities of the SS7 network and the associated translation capabilities of the serving MSC/VLR  30 A. The Multi-SIM invention  70  will retrieve the subscriber&#39;s service profile from an internal database/table  70 C (not shown). The service profile will contain, among other attributes, the complete range of terminal information associated with the subscriber—including the entire suite of IMSI‘x’ and MSISDN‘x’ information associated with the subscriber. At steps  710 ,  730 , and  750  the Multi-SIM invention will propagate the appropriate Supplementary Service MAP message to the HLR(s)  50  associated with a given IMSI‘x’ for each device  1 A,  1 B,  1 C as applicable (in particular, each IMSI‘x’ may be associated with a different HLR). Practitioners skilled in the art will recognize that the number of devices need not be bound to one (1) of three (3) selections and may exceed such limitations to the state of the art. At steps  720 ,  740 , and  760  the HLR(s) will generate and initiate appropriate Supplementary Service MAP response messages which will be forwarded to the Multi-SIM invention  70 . At step  770 , once the Multi-SIM invention  70  has received confirmation that the required supplementary service command has been carried out successfully, the appropriate Supplementary Service MAP response message will be generated and forwarded to the Serving MSC/VLR  30 A. At step  770 , if one of the responses from the HLR indicates an unsuccessful attempt, a Supplementary Service MAP response message indicating an unsuccessful attempt will be provided to the serving MSC/VLR  30 A. An optional manifestation of the invention may roll-back the settings associated with a given supplementary service by invoking the complementary Supplementary Service command (e.g. a DEACTIVATE_SS message to counter a prior ACTIVATE_SS message) (not shown). The optional manifestation of the invention will retrieve the status of a given Supplementary Service setting via the MAP INTERROGATE_SS message (not shown) prior to invoking the subscriber command at steps  710 ,  730 ,  750 . 
         [0057]    Now with reference to  FIG. 1H , at step  800 A, a call will be received by the Gateway MSC  30 C from the PSTN  95 . At step  800 B, the Gateway MSC  30 C will generate and forward a MAP SEND_ROUTING_INFORMATION (SRI) message to the Multi-SIM invention  70 . The Multi-SIM invention  70  will retrieve the subscriber&#39;s service profile using the Primary MSISDN as the index key from an internal database/table  70 C (not shown). The service profile will contain, among other attributes, information pertaining to the specific preferences for call delivery, the last known location of the device based on previous location retrieval attempts, as well as the current list of active or registered devices (as identified via the IMSI‘x’ identifier associated with a given SIM and mobile device respectively). The Multi-SIM invention  70  may use a variety of techniques in order to determine the appropriate mobile device (as identified by the IMSI‘x’ associated with a given SIM and mobile device) for call delivery based on either programmatic methods (for example, the last device that registered) or based on pre-established criteria as provided by the subscriber (for example, the subscriber may rank order a number of devices for call delivery in preferential order). The programmatic methods may in turn be affected by the state of each device (e.g. whether a given mobile device is engaged in a call or registered). At step  800 C, an optional manifestation of the Multi-SIM invention will confirm the status of the selected mobile station by initiating a MAP PROVIDE-SUBSCRIBER-Info (PSI) message to the serving MSC/VLR  30 A. At step  810 , the serving MSC/VLR  30 A will provide a MAP PSI response message containing the status of the mobile station. Depending on the nature of the status information received, the Multi-SIM invention may select an alternative mobile station and confirm the status of the alternative mobile station (not shown) (in effect, steps  800 C and  810  will be repeated). This process will continue until a suitable mobile station (as identified by IMSI‘x’) is determined to be available for the purpose of receiving a call. At step  820 , once a suitable mobile station is selected, the Multi-SIM invention will generate a MAP SRI message and forward it to the HLR. At step  830 , the HLR  50  will generate a MAP PROVIDE_ROAMING_NUMBER (PRM) message and forward it to the Multi-SIM invention  70 . At step  840 , the Multi-SIM invention  70  will forward the MAP PRM message to the serving MSC/VLR  30 A modifying the MTP, SCCP, TCAP, and MAP layers of the message relative to that received at step  830  as required. At step  850 , the serving MSC/VLR  30 A will generate and forward a MAP PRM response message containing the roaming number to the Multi-SIM invention  70 . At step  860 , the Multi-SIM invention  70  will forward the MAP PRM response message to the serving HLR  50  modifying the MTP, SCCP, TCAP, and MAP layers of the message relative to that received at step  850  as required. At step  870 A, the HLR will generate and forward a MAP SRI response message to the Multi-SIM invention  70  containing the roaming number. At step  870 B, the Multi-SIM invention  70  will forward the MAP SRI response to the Gateway MSC  30 C modifying the MTP, SCCP, TCAP, and MAP layers of the message relative to that received at step  870 A as required. 
         [0058]    Still in reference to  FIG. 1H , the Gateway MSC  30 C will establish a call to the serving MSC/VLR  30 A via the PSTN using the routing number received at step  870 B. A characteristic of the disclosed invention is that the incoming calls can be selectively prioritized based on a number of attributes including the state of each mobile device (as identified by IMSI‘x’) and the prescribed routing preferences of the subscriber. Those skilled in the art will recognize that the Multi-SIM invention  70  will appear as a defacto HLR for a Primary MSISDN or IMSI‘x’ from the perspective of the Gateway MSC  30 C and the serving MSC/VLR  30 A respectively. Those skilled in the art will recognize that the Multi-SIM invention  70  will appear as a defacto Gateway MSC and serving MSC/VLR for a MSISDN‘x’ and IMSI‘x’ from the perspective of the HLR  50 . 
         [0059]    Still in reference to  FIG. 1H , an optional manifestation of the Multi-SIM invention  70  may act as an intermediation gateway between the serving Gateway MSC  30 C and a given Service Control Point (not shown) for the purpose of ensuring the seamless support of IN services supported by the Service Control Point (not shown).