VoIP Security is an increasingly important topic for protecting your FreeSWITCH system. Protection strategies include both proactive and defensive technologies. Proactive technologies in FreeSWITCH include multiple types of encryption for both SIP and RTP communication which discourages tampering or eavesdropping with phone calls. Defensive technologies in FreeSWITCH, when combined with other open source tools, can block suspicious or malicious transmissions from unknown sources and prevent abuse or fraud. The importance of combining FreeSWITCH capabilities with generally available open source VoIP tools is essential when running in a production environment.

This chapter is divided into the following four sub-sections:

• Network level protection
• Protecting signaling
• Protecting audio
• Protecting passwords