Describe: The more powerful programs, you can specify the IP address, and voice calls, and call good results.

File list(Click to check if it's the file you need, and recomment it at the bottom):
  VoiceTest(RTC)
  ..............\Debug
  ..............\.....\VoiceTest.exe
  ..............\defines.h
  ..............\ReadMe.txt
  ..............\RequestDlg.cpp
  ..............\RequestDlg.h
  ..............\res
  ..............\resource.h
  ..............\...\VoiceTest.ico
  ..............\...\VoiceTest.rc2
  ..............\rtccore.h
  ..............\rtccore_i.c
  ..............\RTCEvents.cpp
  ..............\RTCEvents.h
  ..............\StdAfx.cpp
  ..............\StdAfx.h
  ..............\VoiceDlg.cpp
  ..............\VoiceDlg.h
  ..............\VoiceTest.aps
  ..............\VoiceTest.clw
  ..............\VoiceTest.cpp
  ..............\VoiceTest.dsp
  ..............\VoiceTest.dsw
  ..............\VoiceTest.h
  ..............\VoiceTest.ncb
  ..............\VoiceTest.opt
  ..............\VoiceTest.plg
  ..............\VoiceTest.rc
  ..............\VoiceTestDlg.cpp
  ..............\VoiceTestDlg.h