This application use sipp. The GUI base application try to create xml and csv files easily and start scenario which are selected.
sipp and mono have to be installed on your PC.
If you want to send RTP packets, you should copy pcap files to same folder where running sipp_gui.
The project "Sippie" is an additional tool for automatically converting Wireshark-Traces to XML - scenarios, which can be easily used as infile for the OpenSource SIPp test tool and traffic generator.