The 5 tools that you should be looking at are:
svmap
this is a sip scanner. When launched against
ranges of ip address space, it will identify any SIP servers
which it finds on the way. Also has the option to scan hosts
on ranges of ports.svwar
identifies working extension lines on a PBX. A working
extension is one that can be registered.
Also tells you if the extension line requires authentication or not. svcrack
a password cracker making use of digest authentication.
It is able to crack passwords on both registrar servers and proxy
servers. Current cracking modes are either numeric ranges or
words from dictionary files.svreport
able to manage sessions created by the rest of the tools
and export to pdf, xml, csv and plain text.svcrash
responds to svwar and svcrack SIP messages with a message that
causes old versions to crash. For usage help make use of -h or --help switch.
Also check out the wiki
And if you're stuck you're welcome to contact the author.