With break ins of enterprise computer networks grabbing the headlines, there is a chance that chief security officers at some corporations and government agencies could be neglecting the lowly office phone. And that may be a costly mistake.

The popular office phones can be hacked using only a viable Internet connection, found researchers at Columbia University.

Silent Knight by Honeywell released a high-capacity firefighter telephone system that is capable of supporting up to 72 telephone connections with as many as 10 phones in use at one time.