CAMEL: Intelligent Networks for the GSM, GPRS and UMTS Network in Visual Studio .NET

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CAMEL: Intelligent Networks for the GSM, GPRS and UMTS Network
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One example is that the HLR sends subscription data for ECT and MPTY However, when the subscriber establishes a call, the MSP CAMEL service determines that, according to the currently active pro le in the SCP, ECT and MPTY are not allowed for this subscriber The permission to use ECT and MPTY may also depend on dynamic factors such as location and time The SCP prevents the use of ECT and MPTY by sending CAP CON or CAP CWA21 to the MSC; the CON or CUE contains SII2 with an indication that ECT and MPTY are not allowed The Network does not Support CAMEL Phase 3 or Higher The HLR will send the active pro le to the VLR The active pro le contains settings for the different services Calls from this subscriber will not lead to the invocation of the MSP service 5292 Setting the Active Pro le The subscriber may use call-related or call-unrelated methods to select a particular pro le in HLR or SCP as active pro le HLR Pro le Selection A subscriber may use the following digit string to select the active MSP pro le (see 3GPP TS 22030 [62]): 59n # SEND; n identi es the pro le; 1 n 4 SCP Pro le Selection MSP speci es that USSD will be used to select the active pro le MSP does not specify the exact USSD string that will be used for selecting the active pro le, but at least the following information should be supplied: USSD service code this will indicate MSP selection; and pro le indicator As an operator option, the USSD string may also include a password Although it is not explicitly mentioned in the MSP speci cation, an operator may use call- or SMS-related mechanisms to select the pro le in the SCP Examples include: Dialled services a dialled service, based on D-CSI, may be activated by dialling a speci c number, eg 0800 59n, where n identi es the pro le The dialled service sets the identi ed pro le as active pro le and then releases the call User interaction a CAMEL service may be invoked, eg a dialled service, that uses user interaction to prompt the subscriber to enter the desired pro le on the terminal MSP does not specify any coordination between the MSP pro le in HLR and the MSP pro le in SCP Hence, an MSP subscriber may change the active pro le in SCP, but not in HLR An operator may take special provision that these two pro les are aligned 5293 Dynamic Pro le Selection When the subscriber is registered in a CAMEL phase 3 network, then the selection of pro le to be applied to that call may be done in two ways: (1) the SCP uses the currently active pro le; (2) the pro le to be used is obtained from call data This differs per call case MO Calls The subscriber may include in the dialled number an explicit indication of the MSP pro le The user may use the following digit string to explicitly select the MSP pro le: Directory Number 59n # SEND; n identi es the pro le;
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21 3GPP TS 23097 speci es the use of the connect only However, the CAMEL MSP service may also use continue with argument
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MSP profiles SCP 1 Selected profile for this call Active profile 3 4
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Calling party number = MSISDN 3 Called party BCD number = +27 83 212 13 908 *591
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Explicit pro le selection for MO call
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Hence, the digits 59n # are added to the dialled number A subscriber may not know whether she is registered in a CAMEL phase 3 network or not If the network supports CAMEL phase 3, then the SCP will use the suf x to select the pro le and remove the suf x from the dialled number If the network does not support CAMEL phase 3, then call processing continues with the suf x The serving MSC may remove the suf x from the number or retain it As explained earlier, each MSP pro le in the HLR may have a different MSISDN The MSISDN that is sent to the VLR may therefore differ per VLR registration process When the subscriber initiates a call, the currently registered MSISDN is reported to the SCP The SCP may use this MSISDN as an indication of the active MSP pro le In Figure 527, the active pro le is pro le 3, but the subscriber selects pro le 1 for this call For this pro le, the calling line identity is set to restricted MT Calls Each MSP pro le may include a different MSISDN Hence, an MSP subscriber may be called with different numbers The number that is used to call the MSP subscriber is used to select the pro le that the SCP will use for that call For call control from the GMSC, based on the reception of T-CSI from HLR, the called MSISDN is available in the ISUP signalling that arrives at the GMSC; that MSISDN is reported to the SCP in the CAMEL service invocation For call control from the VMSC, based on the reception of VT-CSI from VLR, the called MSISDN is not available in the ISUP signalling that arrives at the VMSC; that ISUP signalling contains the MSRN The called MSISDN may, however, be included in the signalling ow from HLR to VLR during call establishment, ie in MAP PRN The VMSC may then use this called MSISDN in the CAMEL service invocation If the HLR does not provide the called MSISDN to the VLR, then the VMSC uses the registered MSISDN (in VLR) in the CAMEL service invocation22 When the SCP applies a speci c pro le for the MT call, the SCP may indicate this with a designated alerting pattern (See also 4 for the alerting pattern) In the example in Figure 528, the subscriber has MSISDN-2 registered in the VLR The calling party uses the MSISDN of pro le 4 to call the MSP subscriber Hence, pro le 4 is used for controlling the call to the B-party One practical use case may be that receiving a call addressed to this MSISDN implies that this terminating call is charged against the private account The alert signal informs the user about the nature of the call, ie private call
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