shadow walker

Hi, I'm new at this forum and I have a question about G.729 codec The problem is this: I have a licensed copy of pbxnsip - version 1.5.1.6 I trying to make a simple conversation between 2 UA (Eyebeam) that can use only g.729 codec - and I get an error message from the server as follow: Could not find matching codec in 0 8 2 3 Is there a way to update the codec support for the current version or do I need to buy a new one? Is the new version of pbxnsip - version 2.1 support the g.729 codec? Thanx, Shadow walker.