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Call Processing Functions
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Call Processing Functions
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BS MS-A
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Serving system
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origination [digits=SPINA-FCS] 1 FEATREQ [digits] featreq [success] confirmation tone or announcement QUALDIR [ORIGIND=no calls] 3 qualdir 2
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Figure 124 An example of SPINA feature activation using the single-step feature control procedure: (1) The subscriber enters the SPINA activation feature code string (SPINA-FCS) and presses the SEND key; the SPINA-FCS is in the form *FC+PIN The serving system detects the FCS and sends the received digits to the HLR in the FEATREQ message (2) The HLR verifies that the PIN is valid and signals operation success in the featreq message The serving system notifies the subscriber that the request was successful (3) The HLR modifies the subscriber s service qualification to disable call origination using the QUALDIR message
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While the SPINA feature is described in ANSI-664 and ANSI-41 primarily as a subscriber-controlled on/off switch for call originations, it is also possible for the home service provider to use the feature in an automatic lock mode as a fraud-deterrent measure In other words, the SPINA feature is automatically activated by the service provider and must be deactivated on a per-call basis by the subscriber (in effect, the feature becomes a derivative of the subscriber PIN intercept feature described in the next section) However, this application of SPINA diminishes in importance when authentication a much more effective fraud-deterrent measure is ubiquitously deployed in the network
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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Call Processing Functions
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Subscriber PIN Intercept
Part 2:
ANSI-41 Explained
The subscriber PIN intercept (SPINI) feature is an application of the OriginationTriggers parameter and OriginationRequest operation building blocks already described SPINI allows the home service provider to set the conditions, like triggers, under which the subscriber may be requested to enter a valid PIN before the network agrees to complete the subscriber s call origination request Figure 125 illustrates the SPINI feature operation when (a) the origination trigger for international calls is set in the serving system, (b) the subscriber attempts to originate an international call, and (c) the interaction with the subscriber is directed by the HLR, using the ANSI-41 RemoteUserInteractionDirective operation It is also possible for the serving system to control the SPINI-related interaction with the subscriber, thereby cutting down on the network signaling traffic between the serving and home systems For this, the serving system must:
Inform the HLR that it is capable of local SPINI feature control Obtain the subscriber s SPINI PIN and SPINI-related call origination triggers
The serving system accomplishes this information transfer in the course of qualifying the MS for service The serving system s local SPINI capability is conveyed in the ANSI-41 TransactionCapability parameter (TRANSCAP), and the subscriber s SPINI PIN and triggers are returned to the serving system in the SPINIPIN and SPINITriggers parameters, respectively With this information, the serving system can control the SPINI-related call origination processing (see Figure 126)
Calling Number Identification Restriction
The calling number identification restriction (CNIR) feature allows a subscriber to prevent the presentation of the subscriber s calling number identification (CNI) information to the call-terminating party The subscriber may be the party who originated the call or a party who is redirecting the call (eg, the subscriber is busy and the call forwarding busy feature is active) As with many features in ANSI-41, protocol support for the CNIR feature has three components:
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Call Processing Functions
12:
Call Processing Functions
BS MS-A
Serving system
origination [digits=international number] 1 ORREQ [digits] RUIDIR [interaction instructions] prompt for PIN digits ruidir [digits] orreq [routing instructions] 5 call proceeds 4 2
Figure 125 An example of SPINI feature invocation using the RemoteUserInteractionDirective operation: (1) The subscriber enters an international phone number and presses the SEND key The call origination to an international destination trigger is set; therefore, the serving system sends an ORREQ message to the HLR including the dialed digits (2) The HLR chooses to query the subscriber for a PIN before allowing the call to proceed; therefore, it sends interaction instructions to the serving system in the RUIDIR message (3) The serving system connects the call to a system capable of user interaction (eg, an interactive voice response unit), prompts the subscriber for a PIN, collects the digits entered by the subscriber, and sends them to the HLR in the ruidir message (4) The HLR verifies that the PIN is valid and returns call routing instructions in the orreq message (5) The serving system continues with call origination, as directed by the HLR
1 Conveying the subscriber s default CNIR feature activity status to the serving system The ANSI-41 CallingFeaturesIndicator parameter contains this information; the HLR sends this to the serving system during the service qualification process
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