Callgen323 is a simple H.323 capable call generator. It supports the 
following:

 - spawning an exact number of calls.
 - receiving an exact number of calls.
 - adjust the delay between each batch of calls.
 - set the number of batches to repeat.
 - The only capability supported is G.711 ULaw 64k and user
   indication.

It makes use of PWLib and the OpenH323 stack from Equivalence Ltd Pty

WWW: http://www.openh323.org/