SiVuS is the first publicly available vulnerability scanner for VoIP networks that use the SIP protocol. The scanner provides several powerful features to verify the robustness and secure implementation of a SIP component.
SiVuS is used primarily by developers, administrators, network designers, managers and consultants to verify the robustness and security of their SIP implementations by generating the attacks that are included in the SiVuS database or by crafting their own SIP messages using the SIP Message generator.

>http://www.vopsecurity.org/html/tools.html