get data from barcode scanner c# ANSI-41 Implementations in C#

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ANSI-41 Implementations
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Figure 184 Network architecture showing point code routing of IS-41 messages from the serving MSC to the subscriber s HLR
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Part 3:
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ANSI-41 Network Implementations
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STP pair alias point code mapping in routing table (point code "W" X) A-links current active point code = X HLR A-links currrent standby point code = Y STP A-links HLR
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A-lin
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serving MSC/VLR
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SS7 network
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nks B-li
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C-links
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B-lin ks
A-links
MSC Message Signal Unit (MSU) SCCP Called Party Address = SSN MTP DPC = point code W (HLR)
STP Message Signal Unit (MSU) SCCP Called Party Address = SSN MTP DPC = point code X (active HLR)
SS7 signaling end-point
SS7 signaling end-point HLR application
Figure 185 Protocol model of point code routing from the serving MSC to the subscriber s HLR
MSC/VLR application
ANSI-41 MAP TCAP SCCP MTP Level 3 MTP Level 2 MTP Level 1 SS7 signaling transfer point (STP)
ANSI-41 MAP TCAP SCCP MTP Level 3 MTP Level 2 MTP Level 1
MTP Level 3 MTP Level 2 MTP Level 1
SS7 A-links
SS7 A-links
If the serving MSC and HLR reside within an SS7 network that supports the GTT function, a translation is performed on the MIN to route the messages to the HLR The serving MSC (which has a roaming agreement with the HLR) maintains a table mapping ranges of MIN values to the alias point code of the mated STP pair Figures 186 and 187 show the GTT routing of ANSI-41 messages to the HLR
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ANSI-41 Implementations
18:
ANSI-41 Implementations
STP pair performs global title translation (MIN HLR point code) A-links
Figure 186 Network architecture showing global title routing of ANSI-41 messages from the serving MSC to the subscriber s HLR
A-lin
serving MSC/VLR
SS7 network
nks B-li
current active point code = X HLR
C-links
B-lin ks
A-links currrent standby point code = Y STP A-links HLR
A-links
MSC Message Signal Unit (MSU) SCCP Called Party Address = MIN MTP DPC = point code Z (STP mated pair alias)
STP Message Signal Unit (MSU) SCCP Called Party Address = MIN MTP DPC = point code X (based on GTT)
SS7 signaling end-point
SS7 signaling end-point HLR application
Figure 187 Protocol model of global title routing from the serving MSC to the subscriber s HLR
MSC/VLR application
ANSI-41 MAP TCAP SCCP MTP Level 3 MTP Level 2 MTP Level 1 SS7 signaling transfer point (STP) SCCP (global title translation) MTP Level 3 MTP Level 2 MTP Level 1
ANSI-41 MAP TCAP SCCP MTP Level 3 MTP Level 2 MTP Level 1
SS7 A-links
SS7 A-links
MINs are mapped to the alias SS7 point code of the STP mated pair serving the HLR The serving MSC enters the MIN into the called-party address field of the SCCP UDT message The MSC also enters the alias point code of the STP mated pair into the DPC of the message When the MSU is delivered to either of the STPs of the mated pair, the STP performs GTT and routes the MSU to the appropriate HLR
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ANSI-41 Implementations
Part 3:
ANSI-41 Network Implementations
The serving MSCs are required to contain routing table information to support routing of ANSI-41 transactions to the subscriber s HLR Each MSC requires two databases:
The number-range database maps ranges of subscriber numbers (MINs in the form of NPA-NXX codes) onto MSC IDs (ie, the identification of the HLR which serves the associated subscriber) The current network address database identifies the DPC for the associated MSC ID
If GTT is used, the current network address database can contain merely the DPC for the first STP that performs GTT, as opposed to hard-coding HLR network addresses into each MSC In most cases, the STP provides SS7 message screening, based on the following parameters:
MTP OPC MTP DPC SCCP calling-party address (before and after GTT) SCCP called-party address (before and after GTT)
This screening provides the security mechanism to prevent unauthorized network access to the HLR It further validates the identity of a calling-party address by restricting it to preapproved link sets Point Code/SSN as System Identifier Point code addresses are managed by the MTP Level 3 portion of the SS7 protocol They are unique across SS7 networks and represent the physical node address of each signaling point Subsystem numbers (SSNs) are managed by the SCCP portion of SS7 They represent the address of an application at an SS7 signaling point The following SSNs are used for ANSI-41:
5 mobile application part (MAP) 6 home location register (HLR) 7 visitor location register (VLR) 8 mobile switching center (MSC) 9 equipment identity register (EIR) 10 authentication center (AC) 11 short-message service (SMS) 12 over-the-air service provisioning function (OTAF)
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