A couple of weeks ago Paul Brislen posted a really good post on the TUANZ blog about PABX security. It seems some criminals had used a local companies phone system to route a huge number of international calls, leaving them with a colossal ($250k!) phone bill. These attacks are increasing common, and I have heard a number of similar stories.
Phone systems increasingly rely upon IP connectivity and often interface with other business processes, putting them in the domain of IT. But even if your PABX is from 1987 (mmm beige) and hasn’t been attacked yet, doesn’t mean it won’t be.
Both Telecom NZ and TelstraClear NZ have some good advice to start with, and you might find your PABX vendor can also give expert advice. Unfortunately many PABX systems are insecure from the factory, and a number of vendors don’t do a great job with security.
In a previous role I ended up managing several PABX systems spread across multiple sites, and learnt a few lessons along the way. Here are a few tips to get you started: