With all of the VoIP tools available it’s easy to forget to test the IP stack of your VoIP phone for stability from classic attacks. With that in mind, a good tool for accomplishing this basic vetting is called Targa3. Written way back in 1999, Targa3 encompasses several attacks such as Jolt, Nestea, etc. to “generate attacks using invalid fragmentation, protocol, packet size, header values, options, offsets, tcp segments, routing flags, and other unknown/unexpected packet values.”
You can grab Targa3 from Packetstorm here. Oh, and happy toasting. 🙂