RTP streaming test

Hi all
I am just getting to know the Asterisk server. I want to test if streaming works. I am developing voip app for blackberry and I need to test if i can receive rtp packages successfully. Is there any way to execute a command(from the asterisk command line perhaps) and to make asterisk start streaming rtp packages to my blackberry(even a sample rtp package is enough just to make sure that i can receive successfully and my blackberry audio player parses it correctly)?

The command is: rtp set debug on/ip/off.