Right now, we're using the user-specified filename (see https://github.com/mojolingo/sippy_cup/blob/develop/lib/sippy_cup/scenario.rb#L518). When PCAP and the scenario are written to tempfiles, the filename doesn't match the user-specified one. I suggest we use some sort of placeholder, write the PCAP out first, then replace the placeholder in the XML with a path to the tempfile just before the scenario is written out.
Right now, we're using the user-specified filename (see https://github.com/mojolingo/sippy_cup/blob/develop/lib/sippy_cup/scenario.rb#L518). When PCAP and the scenario are written to tempfiles, the filename doesn't match the user-specified one. I suggest we use some sort of placeholder, write the PCAP out first, then replace the placeholder in the XML with a path to the tempfile just before the scenario is written out.