[Freeswitch-users] First setup, Cannot hear anything

Hello, I'm trying to build Freeswitch 1.4 from source on debian 7.6 After setup, I try to do some test. However I cannot hear anything. I barrely modify default setup, (just change default ip, password etc) I try to do some test, everhing ok on log, fs_cli. no Errors lots of progress debugs. However I cannot hear anything from sip phone Like calling 9664 does not produce any sound. Even I try ther wav files no sound. What can be wrong... My best regards.