Hi,
Hope you are doing well !!!
Please have a look to similar work done recently :-
[login to view URL] (Cloud based PBX)
Can you please share your exact BRD or project flow documentation for your requirements so that i can analyse the complete scope to share many ideas, suggestion and different point of view to make your application more secure and scalable.
I would like to update you that I am Sr. PHP Developer having over 6+ years of quality experience in working on IVR & VOIP based calling project. I have worked on Asterisk, FreePBX, Twilio, Plivo as well as other VoIP trunk providers.
Looking forward for your Cheerful response.
Regards,
Rahul