Hello.
I've developed a custom PBX .. This PBX includes Admin Panel, User Panel and Agent Panel.
I have already sold it out to couple of clients and they are using it without any issue.
I can give you a FREE Demo.
This PBX has all the features. like IVR, Call Recording, Live Calls Monitoring, Queues, Call Transfer, Voice mail, Voicemail to email, Call Conference ... etc.
Please visit following link. you can see that I sold it out to the project owner who wanted
to have a custom pbx. Not opensource.
www.freelancer.com/projects/PHP-MySQL/Custom-PBX-Solution-Opensource/
You can check the reviews of this project by visiting my freelancer.com profile.
www.freelancer.com/u/aneelmahmood.html
Please let me know if you are interested in free demo.
Regards,
Aneel