This simple tool is useful to test a PABX with “allow guest” parameter set to “yes” (in this scenario an anonymous caller could place a call). The aim of the tool is to ring all the sip Terminal Equipment (phones).
You can download it from the following link: https://packetstormsecurity.com/files/download/115852/storm-ring.tar.gz
Source: https://packetstormsecurity.com/files/115852/Storm-Ringing-PABX-Test-Tool.html