Hello,
If you want to monitor the live calls then I would like to let you know that I have already developed WALLBOARD kind of interfaces for asterisk and some software. These wallboards display live calls
with RINGING, ON-CALL, and Live Call Duration.
I will not be using any open source product. I already have developed my own code and I will provide you after customizing it as per your needs.
Do you want to monitor calls coming from specific users? right? or all the users?
Regards,
Aneel