Hi,
        I have downloaded the source code of "h323plus core"(version:1.23.0)
and "PTlib"(version:2.10.1) from the link:
     *http://www.h323plus.org/source/ *
     on my X86 Desktop system running ubuntu 10.04
   I have followed the tutorial given at link
      *http://toncar.cz/openh323/tut/index.html*
   I am able to compile both the source codes without any problems.
  Then I have downloaded and compiled "oh323tut" (version 1.1-1) source code
from the link below:
       *http://toncar.cz/openh323/tut/files.html*
  I have got simph323 installed on my system using
  $ sudo apt-get install simph323
 Now when I try to run oh323tut application and simph323 application (in
separete terminals) using the commands below:
$ ./oh323tut -f audio.wav -n -u 320
$ simph323 -n -u 321 320@127.0.0.1:1820
   I am getting the following problem:
 H323> Could not open sound device Default - Check permissions or full
duplex capability.
  Can anybody please help to  solve the above problem.
 Regards
Abdul Moiz