# Enabling IMEI Checking

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Descriptions

The International Mobile Equipment Identity (IMEI) is a number unique to every GSM mobile phone. It is usually found printed on or underneath the phone's battery and can also be found by dialing the sequence *#06# into the phone.

The purpose of a mobile equipment's IMEI is to provide a means to identify, trace, track or deny service to the mobile station when it is used by a subscriber to access the network. When an event requiring an IMEI check occurs (e.g. MOC, location update), the MSC requests the IMEI from the mobile station. The events requiring an IMEI check can be administered within the MSC.

The Equipment Identity Register (EIR) is a function to identify valid IMEIs and therefore can be used to stop a stolen phone from accessing the network. For example, if a mobile phone is stolen, the owner can call his or her network provider and instruct them to "ban" the phone using its IMEI number. This renders the phone useless, regardless of whether the phone's SIM is changed.

To enable IMEI checking, SCCP and VLR parameters need to be configured on NSS side.

Implementation

| Configure SCCP Parameters

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

2.Make sure the System ID at the upper right corner displays SCCP(MSS_Pub), click the button .

1.Click the Local Node tab.

2.Click the hyperlinked index number of EIR to open the EIR Option window.

3.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
Network Indicator | Specify the local node to a network. Choose the same network as MTP3 setting. | National
MSISDN | The E.164 node address of EIR. | CC+NDC+SN format
IP 0 | IP address of EIR 0. | 172.18.98.1
IP 1 | IP address of EIR 1. | 172.18.99.1

| Configure VLR Parameters

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

2.Click the button at the upper right corner.

1.On the System tab, click parameter value in IMSI Verification field to open its Option window.

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

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

Sub-parameter | Description | Recommended Value
Location Update | Enabling this parameter forces the system to check the validation of the International Mobile Equipment Identity while performing a Location Update. | Enable
MO | Enabling this parameter forces the system to check the validation of the International Mobile Equipment Identity while making a Mobile Originating call. | Disable
MT | Enabling this parameter forces the system to check the validation of the International Mobile Equipment Identity while making a Mobile Terminating call. | Disable

See Also

• Enable Ciphering

• Enable Authentication Service

• Manage EIR Subscribers

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