Secure SMS Configuration

Introduction

The Secure SMS feature in Transight telematics devices is an extra layer of security designed to prevent unauthorized SMS communication with the device. This feature is especially useful when using open SIM cards, which are more vulnerable compared to M2M SIM cards.

Why Secure SMS is Needed

• M2M SIM Cards: These are protected by telecom-level whitelisting, allowing only authorized numbers to send or receive SMS commands.

• Open SIM Cards: These do not have such protections. Anyone with access to the number can potentially send commands to the device, leading to misuse.

Secure SMS ensures that only two pre-approved mobile numbers (called CUM1 and CUM2) can send SMS commands to the device.

How Secure SMS Works

Once Secure SMS is enabled:

• Only the two configured numbers (CUM1 and CUM2) can send SMS commands to the device.

• SMS commands from any other number will be ignored.

Configuration Steps

1. Set Primary SMS ID (CUM1)

Use this command to set the first SMS number:

SET CUM1:<+91xxxxxxxxxx>

Example:

SET CUM1:+919696969696

To verify, send:

GET CUM1

Expected response:

IMEI: 862942074896044  

Command: GET CUM1  

Response: M1: +919696969696  

Error: 0

2. Set Secondary SMS ID (CUM2)

Once CUM1 is set, you can set the second number (CUM2) only from the number configured as CUM1.

SET CUM2:<+91xxxxxxxxxx>

Note: For M2M SIMs, the CUM2 number must also be whitelisted.

3. Enable or Disable Secure SMS

Use the following command to enable or disable Secure SMS:

Important: Secure SMS is disabled by default. Always set the CUM1 number before enabling Secure SMS, because once enabled, only the CUM1 number will be allowed to communicate with the device.

• To enable: SET CUSECURESMS:1

• To disable: SET CUSECURESMS:0

Where:

• 1 = Enable

• 0 = Disable

4. Mandatory Command After Configuration

After completing any Secure SMS configuration, please execute the following command to ensure proper saving and execution of the changes:

SET CUMR:2

Important Notes

• Always verify that the mobile numbers you configure are valid and reachable.

• For M2M SIMs, ensure the numbers are whitelisted with the telecom provider.

• Secure SMS is strongly recommended when using open SIM cards for added protection.

Conclusion

Secure SMS is a simple yet powerful feature that helps safeguard your telematics devices from unauthorized SMS commands. Proper setup ensures only trusted users can manage or reconfigure the device.