which plugin are you referring to? this one: https://www.npmjs.com/package/homebridge-openhab2 ?
There is a HomeKit Add-on - System Integrations | openHAB available and it’s better to use that instead of the homebridge.
Anyway, open up a new thread and post your setup.
Which firmware is running on your IP150?
Which Paradox Panel do you have with which firmware?
There are solutions to enable voice control of your security panel