If are receiving messages through your SMS modem, that is the first step. However, if you wish to acknowledge the alarms remotely from your phone, you will need to follow this procedure:
How to acknowledge alarms through SMS texts:
Add a user and set them with acknowledgement and authorization codes
Authorization code is what you would use to make changes through voice. Acknowledgement code is the code you would use to acknowledge alarms remotely.
[Alarm ID number] : [acknowledgement code]
When you have successfully acknowledged an alarm through SMS, it will give a message saying “Alarm Acked”
You will need to know your authorization code before acknowledging alarms and make sure that you have configured authority for users to acknowledge SMS messages.