Paul Ogle at VoIP-News alerts me to a newly posted article on their site. The article is entitled, Is Someone Listening To Your VoIP Calls?
Calls transmitted via a LAN, a WAN or the Internet can be easily intercepted by anyone with a protocol analyzer, simply by capturing and analyzing the voice packets. This means that just about anyone can snoop on your business and personal calls, including employees, business partners, competitors, law-enforcement authorities and government officials.
Article author John Edwards (one of the other ones) then makes the case for encryption, and offers basic but quite helpful intros about Zfone, Internal Encryption, TLS (Transport Layer Security) and IPsec (IP Security, SRTP (Secure Real-Time Transfer Protocol) and VPN (Virtual Private Network.
SRTP sounds intriguing for a number of applications.
"SRTP is ideal for protecting VoIP traffic because it has a minimal effect on call quality," Edwards writes. "For each call you make, a unique encryption key is created, which makes eavesdropping almost impossible. This attribute alone makes SRTP a good choice for day-to-day calls, as well as highly confidential conversations."
BTW, all you'd ever want to know about SRPT is here.