# Enabling Country Specific Roaming Restriction (CSRR)

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Descriptions

The Country Specific Roaming Restriction (CSRR) feature provides for additional fraud protection within the HLR by enabling allowed roaming areas to be specifically defined for each subscriber. The CSRR defines 8 portfolios with up to 256 VPLMN ranges.

The service provider establishes the actual definition of each VPLMN range. The subscriber chooses the areas in which service should be allowed or not allowed through updates through Customer Services. If a subscriber enters an area where service is prohibited or not authorized, the HLR will deny the subscriber's registration.

The HLR maintains a list of 8 CSRR portfolios in which the subscriber is either allowed or denied service. The CSRR is positive (service is allowed only in the areas listed). A subscriber may choose one of CSRR portfolios or just select "No Restriction" to disable this function.

Implementation

| Define VPLMN Ranges and CSRR Portfolios

1.Go to EMS >Configuration >NSS >HLR.

2.Click the button at the upper right corner.

1.On the System tab, configure the relevant parameters given in the following table.

2.Click the button to update parameters to application servers.

Sub-parameter | Description (Click highlight SAVE after change) | Recommended Value
CC | The Country Code identifies the country in which the Home PLMN is located. | --
NDC | The National Destination Code identifies the home PLMN. | --
Start SN | Identifies the beginning of local MSISDN number range. | --
End SN | Identifies the end of local MSISDN number range. | --
CDR Flag | Enable or disable HLR CDR generation. | Disable

1.Click the VPLMN tab, and then click New at the bottom of the VPLMN table.

2.In the VPLMN ID box, select an available number for the new VPLMN, and then click the button.

3.In the VPLMN Option window, configure the relevant parameters given in the following table.

4.Click the button to update parameters to application servers.

Sub-parameter | Description (Click highlight SAVE after change) | Recommended Value
CC | The Country Code (CC) which identifies the country in which the GSM VPLMN is located. | --
NDC | The National Destination Code (NDC) which identifies the GSM VPLMN in that country. | --
Start SN | This parameter identifies the beginning of a VLR number range. | --
End SN | This parameter identifies the end of a VLR number range. | --

1.Click the CSRR List tab to display the CSRR List table.

2.Click the hyperlinked parameter value of an available entry to open its Option window.

3.Configure the relevant parameters given in the following table, click the button to return.

4.Click the button to update parameters to application servers.

Sub-parameter | Description | Recommended Value
VPLMN ID | The CSRR list defines the roaming restriction for 256 VPLMN which corresponds to the VPLMN configured previously. | Enable

| Assign CSRR Portfolio to Subscriber

1.Go to EMS >Account >Subscriber >HLR.

2.Click the hyperlinked IMSI of the subscriber to open its Option window.

3.In the CSRR Type drop-down menu, select the corresponding index number of the eight CSRR portfolios.

4.Click the button to update modified attributes to HLR database.

Sub-parameter | Description | Recommended Value
CSRR Type | Select the corresponding index number of the eight CSRR portfolios. •00 - 07 = CSRR Portfolio Index Number ->Allowed VPLMN Combinations •No restriction | --

See Also

• Manage HLR Subscriber

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