ive used the telguard tg-1 express with hai. you hook it up to phone line on the hai board and it will call out like it normally would with a phone line hooked up. you have to have an account with telguard to register the cell unit and have a monitoring service that will monitor the signals. if its a newer hai you might be able to hook it up on the network and use the snaplink app to control the system

[Link: pvt1.telguard.com]