asterisk users - May 2005 - Agent Queues/XTen X-Pro/Multiple Call Appearance

It's me again.

I'm using XTen X-Pro softphones which have the ability to handle  
multiple conversations simultaneously. When my agents login and calls  
come in, everything works fine, as expected. Calls are directed to  
available agents, and when no agent is available, the caller sits in  
queue.

However, since the X-Pro has the ability to handle multiple calls,  
how can I make the Queue application send additional incoming calls  
to the agents, even though they may be using a line? The agent should  
see the light of the other lines blinking and he/she may decide to  
get it or not. In the mean time, the caller is still waiting in  
queue, but at least, the agent knows that there are more callers  
waiting.

Thanks,
Waldo