Klaus, The application is trying to connect to the server on 192.168.1.141:5061 while ser is not listening on that port for tcp nor udp traffic. I tried to include the following line in ser.cfg listen=192.168.1.141:5061 I restarted ser but it still does not seem to be listening on this port. What should i do so that ser listens to udp traffic on port 5061? Please help. Thanks, Annie