asterisk users - Mar 2010 - asterisk-users] how to create a dummy call

Hi all,

What i'm going to do is that enable caller sing while playing a
background music. My approach is using Monitor and Meetme app.
Caller make a call to asterisk, asterisk join caller in to a voice
conference and create a dummy caller which will play music. Monitor app
record both music and singer's voice. 

But i dont know how to create a dummy caller or throw a dummy call in
order to do above task.

Any idea or comment is appreciated.

Thanks
Quyps