[asterisk-users] Beginner Issues

[John Koenig]

I am new to asterisk, and I am having some troubles.

I have a fresh copy of asterisk, libpri, zaptel, asterisk-addons, and 
asterisk-gui installed on centos (I built everything using ./configure, 
make, make install, make samples).  I connected to the GUI interface and 
created two new users.   I used the two users accounts to connect up a 
couple of IP phones for testing.  The phones connect to the server just 
fine, and I can even place a phone call to the other phone.  However, I 
cannot hear anything on the dialed phone.  The only thing I am able to 
hear is my own voice looping back to the phone I place the call from. 

Any ideas as to what I am missing?

John Koenig