Asteroid is a SIP Denial of Service testing tool. It consists of over 36,000 unique SIP packets and can be quickly modified to create others. Packets are grouped into their respective types (INVITES, BYE, CANCEL, etc.) and can be sent individually or called from a shell script and sent in clusters. Asteroid has effectively crashed all versions of Asterisk up until 1.2.13 and greater which were patched against the sequence which caused the crash.