Before setting up SMSEagle as the SMS gateway for OpManager, make sure that: you have the SMSEagle hardware ( You can purchase SMSEagle hardware from here if you don't have one).
Note: SMS Eagle is a hardware based SMS gateway setup. An active internet connection is not required as long as you have direct connectivity between the server in which OpManager is installed and the SMSEagle hardware.
In OpManager:
Click here to learn how to setup a SMS notification profile and start receiving notifications.