# Enabling Authentication

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Descriptions

The Authentication Center or AUC is a function to authenticate each SIM card that attempts to connect to the GSM network. Once the authentication is successful, the HLR is allowed to manage the SIM and services. If the authentication fails, then no services are possible from that particular combination of SIM card and mobile phone operator attempted. There is an additional form of identification check performed on the serial number of the mobile phone described in the EIR section below, but this is not relevant to the AUC processing.

In the authentication process, each MS sends a registration request and receives a unique challenge from the network. The MS calculates the response to its challenge and sends a message back to the network. The VLR, which contains a list of triplets (unique challenge, response to the challenge, and private key), compares the triplets with the response it received from the MS. If the response matches, the MS is registered with the network and the used triplet discarded. After all triplets are used, the VLR queries HLR for a new set. Each query typically results in three triplets. The UltraWAVE system can optionally give permission to reuse triplets to reduce the communications load.

To enable Authentication, 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 AUC to open the AUC 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 AUC. | CC+NDC+SN format
IP 0 | IP address of AUC 0. | 172.18.98.1
IP 1 | IP address of AUC 1. | 172.18.99.1

| Enable Authentication Service

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 Authentication 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 verify the authentication info of the mobile subscriber while performing a Location Update. | Enable
MO | Enabling this parameter forces the system to verify the authentication info of the mobile subscriber while making a Mobile Originating call. | Disable
MT | Enabling this parameter forces the system to verify the authentication info of the mobile subscriber while making a Mobile Terminating call. | Disable

| Enable Triplets Reuse

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 Reuse Triplets 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
Reuse Triplets | Enabling this parameter permits a mobile to reuse triplets previously assigned to it by the system. | Enable
Double Authentication | Enable this parameter to force the system to perform a second authentication processes when the initial authentication fails. | --

See Also

• Enable Ciphering

• Enable Equipment Identity Register

• Manage AUC Subscribers

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