barcode reader c# source code Figure 1232 The feature control with call routing process in Visual C#

Read Denso QR Bar Code in Visual C# Figure 1232 The feature control with call routing process

Figure 1232 The feature control with call routing process
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BS MS-A
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Serving system
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origination [digits=feature code string] FEATREQ [digits] featreq [success, routing instructions] confirmation tone or announcement route the call
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Per-call Feature Control
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Some features allow activation or deactivation on a per-call basis:
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Calling number identification restriction may be activated or deactivated for a single call Call waiting may be deactivated for a single call
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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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12:
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Call Processing Functions
Message-waiting notification may be deactivated for a single call Priority access and channel assignment may be activated for a single call
ANSI-41 supports this capability by supplementing the basic feature control procedures with the OneTimeFeatureIndicator (OTFI) parameter; this provides a per-call feature control service An example of the process for deactivating CW for a call is illustrated in Figure 1233
BS MS-A
Serving system
origination [digits=feature code string] 2 FEATREQ [OTFI, digits] featreq [success, OTFI, routing instructions] confirmation tone or announcement 4 5 6 route the call turn CW back on at the end of the call 3
Figure 1233 The per-call feature control process: (1) The subscriber enters a feature code string, including the cancel-call-waiting feature code and a called directory number, into the MS and presses the SEND key (2) The serving system recognizes the received digits as a feature code string and sends the string to the HLR in a FEATREQ message ANSI-41 specifies that the serving system also initializes the OTFI parameter and includes it in the FEATREQ message (3) The HLR processes the feature control request The subscriber is authorized for demand CW cancellation; therefore, the HLR deactivates CW for a single call by setting the Call Waiting for Future Incoming Call (CWFI) field in the OTFI to the value No CW The HLR returns a success indication to the serving system in the featreq message, along with the revised OTFI parameter and routing information corresponding to the called directory number received in the FEATREQ message (4) The serving system provides the feature confirmation indication to the MS (5) The serving system turns off CW for the call and establishes a call to the specified directory number (6) At the end of the call, the serving system turns CW back on for the MS
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Call Processing Functions
Part 2:
ANSI-41 Explained
Multistep Feature Control
The multistep feature control service is used when additional information beyond the initial feature code string is required to effect a feature control operation The most common additional information is a password or a personal identification number Currently, the only standardized features that require this capability are:
Subscriber PIN access, where it is required for PIN entry during registration, activation, and deactivation Subscriber PIN intercept, where it is required for PIN entry during registration Voice message retrieval, where it is required for VMR password entry during feature invocation
However, the capability is generic and may be used for future standard features as well as nonstandard feature control purposes The process works as illustrated in Figure 1234 Following completion of a successful feature control procedure, the HLR may invoke the service qualification process to convey the subscriber s new profile to the serving system
Remote Feature Control
Remote feature control (RFC) service is similar in concept to the multistep feature control service However, the RFC service may be accessed from any land line or mobile station, not just the subscriber s own mobile station10 The service works as follows (see Figure 1235): 1 The subscriber calls a special RFC directory number (say, 1-800SYNACOM) The PSTN delivers the call to the RFC access system, which acts as the originating system for the call 2 The RFC access system launches a LOCREQ message to the HLR 3 The HLR sends a RUIDIR message to the RFC access system 4 The RUIDIR message directs the RFC access system to (a) Connect the subscriber to a unit capable of voice prompts and digit collection
Of course, the capability to access the service from other than the subscriber s (authenticated) mobile station opens the remote feature control service to potential fraud It would appear advisable to deploy this feature with caution
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