Before the test VoIP，Want to achieve some tests by sweeping udp port，Internet search，This handy tool to find Zenmap。
Zenmap是有圖形介面的Nmap，Artistic ability not provide a scan tool small 這個，From basic ping、scan tcp port及scan udp port等等，After selection method 擇好 掃描，Program will produce the relevant parameters，Nmap to scan。
[Links]
- Zenmap – Official cross-platform Nmap Security Scanner GUI
