exeicomltd

Hi, I've update to 2.0 version on win2003 server. When I start the server all work fine but, after a random time, when an extension make an external call, I see this error: 500 Server internal error. All extensions can receive calls but can not make calls outside. I must shut down and restart win2003 server and Axon work fine. What is the problem ? Thanks to all ! Daniele