Internet and Web Application Security, 3rd Edition

Securing Telephone and Private Branch Exchange Communications

Private Branch Exchange (PBX) administrators must take the necessary precautions and exercise due diligence like administrators of any other system. PBXs are not new technology. PBXs are the central routers or switching devices for handling telephone traffic. That includes voice telephone, fax, and modems. Some of the more modern PBX systems might also handle VoIP and other SIP traffic.

PBXs are as prone to malicious behavior as any other equipment, and given the wide range of valuable data crossing through them, PBXs make an attractive target. However, if you do your due diligence, you can secure a PBX with relatively high confidence. Further securing the PBX might require vendor-specific ...