-perform mic/speaker operations before event callbacks

git-svn-id: https://gnunet.org/svn/gnunet@31162 140774ce-b5e7-0310-ab8b-a85725594a96
-test two incoming calls at the same time, plus suspend/resume

git-svn-id: https://gnunet.org/svn/gnunet@31163 140774ce-b5e7-0310-ab8b-a85725594a96
adding test for immediately rejected phone call

git-svn-id: https://gnunet.org/svn/gnunet@31164 140774ce-b5e7-0310-ab8b-a85725594a96