EnableSecurity VoIPPack for CANVAS is a set of tools that are designed to work with Immunity CANVAS software. The tools target VoIP systems such as PBX servers, IP Phones and SIP gateways. The tools currently feature:

sipscan - Scans the network for SIP devices and identifies the user-agent and if the device is a PBX

sipenumerate - Enumerates extensions on a PBX server

sipcrack - Launches password attacks on the PBX server

sipautohack - Given a target network, this module will scan for SIP devices, enumerate any extensions on all PBX servers found and try to guess their password

Check out the demonstration videos at: http://enablesecurity.com/products/enablesecurity-voippack/