Summary

You should now be comfortable scanning for VoIP devices and supporting infrastructure, both externally and internally. This includes firewalls, routers, VoIP phones, VoIP softphones, VoIP PBXs, DHCP servers, TFTP servers, and so on. By using a combination of UDP, TCP, SNMP, and ICMP scanning techniques, you should now be able to visualize much of our target's network topology. In Chapter 3, "Enumerating a VoIP Network," the next phase we'll discuss involves conducting a more detailed investigation of many of the network services we just identified.