We have a Virtual Number being used from Exotel for Phone number Masking.
Sellers can contact buyers by dialing our phone number + a 4 digit pin ( which we assign in our CRM).
Then virtual number dials the buyersnumber.
There is a script in our server that maps the pins with buyers' phone numbers.
Old system was uptill last week. Need this thing working. Its not complicated all the telephonic system is handeled by [login to view URL] all we need to do is map the buyer numbers to pin & fetch the phone number on a URL when the pin is entered.
They have a support team who are ready to help, so if you are not phone shy its easier for you.