The main features of VoIP SEAL are as follows:
Calls arising from spam-generating-software and calls from real individuals are separated by a Turing test. Before connecting the call, VoIP SEAL detects and blocks the unauthorised access based on the communication pattern observed during a call. This enables the detection and blocking of SPIT and prevents the user’s phone from ringing unnecessarily.
By adopting a module structure, VoIP SEAL enables rapid response to new kinds of SPIT attacks, without adjusting the system, by adding and updating modules to respond to new and different kinds of SPIT.
The adoption of a module structure also realises response to a broad range of applications by enabling flexible and easy customisation of systems to meet the needs of a variety of hardware, such as SIP servers, session border controllers, home network equipment and terminal equipment.
NEC carried out a SPIT attack simulation project employing VoIP SEAL to verify the technology’s ability to protect against SPIT. This project showed that 99% of SPIT was detected and blocked, preventing users from receiving unwanted and bothersome calls.