My O’Reilly friends over on Makezine and Radar have both noticed the presentation slides on VoIPhreaking - An Introduction to SIP Hacking that are now online from the 22nd Chaos Communication Congress. There’s no doubt that as VoIP systems contiune to proliferate, so will the efforts to hack them.

Within the last year VoIP devices and applications flooded the market. SIP (Session Initiation Protocol) became the industry standard although it’s still under constant development. VoIP networks converge with the PSTN and thus offer ways and means for new (and old) attacks. The talk gives a brief introduction on how various components in the VoIP universe interact.

Nikolaj Nyholm notes that this may get especially interesting as voice apps get more linked with payment systems, as is expected with the eBay/Skype deal:

The phone phreakers of 80s galore are back. In the context of ETel, it will be interesting to follow how this ultimately impacts the next stack of applications building upon VOIP, including the expected merger of voice and payments (Skype/PayPal)….