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HLR-A MNP SRF MAP SRI-Res ISUP IAM [MSRN] To VMSC of MSISDN-B MAP SRI ISUP IAM [MSISDN-B]
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such as HLR query by SMS-GMSC, gsmSCF-initiated USSD signalling based on MSISDN, anytime interrogation, etc ITU-T also speci es number portability methods; refer to ITU-T Q7691 [139], ITU-T Q-series supplement 3 [146], ITU-T Q-series supplement 4 [147] and ITU-T Q-series supplement 5 [148] 6813 Flexible HLR Allocation The MNP SRF in some operators networks is also used for non-MNP purposes In those networks, the SRF intercepts all MAP signalling directed to an HLR in that network Examples of such signalling include: Location update the IMSI of the served subscriber is used for HLR addressing MT call handling the MSISDN of the served subscriber is used for HLR addressing Any-time interrogation the IMSI or MSISDN of the served subscriber is used for HLR addressing The SRF contains tables that associate an HLR with each IMSI and MSISDN The operator may move user subscription information from one HLR to another without impacting the MSISDN or IMSI When moving subscription information to another HLR, the SRF is recon gured for the new HLR address This exible allocation HLR may be useful for: HLR upgrade or replacement; and placing speci c subscriber groups, eg UMTS subscribers, in a designated HLR 682 MNP SRF Query by gsmSCF For various call cases, an on-line charging system based on CAMEL has to rate a call to a number within the home country s number portability domain If a call is established to a number that is recognized as an MSISDN, then the CAMEL service may not know whether the call will be routed to a subscriber in the HPLMN or to a subscriber in another PLMN in that country For these cases, the gsmSCF may query the MNP SRF (Figure 653) The gsmSCF queries the MNP SRF to obtain the subscriber s portability status If the subscriber is ported, then the MNP SRF returns the RN related to the subscriber s current subscription network The gsmSCF then uses the RN to determine the rate for a call to that subscriber The MNP SRF query may also be used for other services, such as SMS on-line charging or VPN 3GPP TS 23078 [83] lists the exact information that may be returned by the MNP SRF to the gsmSCF The MNP SRF query is done with MAP ATI ATI is enhanced; the ATI request may contain an indication that MNP information is requested; the ATI result may contain the requested MNP information The MNP SRF that is queried with MAP ATI may in practice be an NPDB without SRF capability Although the gsmSCF may obtain the MNP status of the called subscriber, the core
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network must still apply MNP handling to route the call to the subscription network of the called subscriber When the MNP SRF receives MAP ATI, this MAP message may or may not be destined for the MNP SRF The following cases may be distinguished: MAP ATI is sent to MNP SRF for MNP query the gsmSCF uses a translation-type (TT) value in the SCCP signalling towards the MNP SRF, indicating that the MNP SRF will act as the signalling end point for this message Refer to ITU-T Q713 [135] for a description of TT For the MNP SRF query, a national TT value should normally be used The MNP SRF will unpack the SCCP message and process the MAP message (MAP ATI) MAP ATI is sent to HLR the gsmSCF uses a TT value in the SCCP signalling towards the HLR, indicating that the MNP SRF will act as a signalling relay point for this message The MNP SRF will use its MNP database to forward the SCCP message to the HLR for this subscriber A similar TT value is used when the gsmSCF sends other MAP messages to the HLR, using MSISDN for addressing the HLR The TT value to be used for addressing the MNP SRF as signalling end point is not standardized by ITU-T, but is allocated nationally In general, when an entity needs to send a message to the HLR and uses IMSI to address the HLR, then there is no MNP issue When a subscription is ported to another operator, the MSISDN may be ported to the other operator, but not the IMSI Hence, the IMSI always reliably indicates the operator a subscriber belongs to 683 Non-standard MNP Solutions Some networks use non-standard solutions for MNP One example involves the enhancement to CAMEL service invocation (Figure 654) In Figure 654, the STP intercepts the CAP IDP directed to the SCP The CAP IDP may in fact travel through an STP in the HPLMN of the served subscriber in any case, for the translation of the GT of the gsmSCF to the SPC of the SCP Before forwarding the CAP message to the SCP, the STP unpacks the SCCP message and, if needed, queries the MNP SRF If the called party BCD number contains a number of a ported subscriber, then the
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On-line charging SDP SCP CAP IDP [Called party BCD number = 12 06 516 13 555 ] STP & MNP SRF CAP IDP [Called party BCD number = 06 516 13 555 ] DTAP SETUP [06 516 13 555] VMSC ISUP IAM to ported subscriber
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