Hello.
The hub is not able to directly connect to a central station at this time, but however it is possible to integrate monitored alarm systems to SmartThings (see here, here, and here.) Sorry if this is a let down for you, but it’s just not something that makes sense to add to the SmartThings product at this time.
Keep in mind that you can always set it up to send texts to family members and friends as well as set of sirens, etc.
Have a good day!
Ben