Tech Support executive is the one who supports customers
As Mr. Dhaval said voice process can be either inbound or
Nonvoice process is a process where we dont get any phone
calls or we dont make any outbound calls but still we
recieve requests or complaints from customers it can be by
the means of Chat or email etc.
About backend for better understanding i will explain in
software terms. JAVA is Front end and Oracle is Backend.
frontend is the thing which we can see with our naked eye.
and back is a process which we cant see with our naked eye
but we know that the process happened.
Telecalling - You might have recieved many calls from many
telecallers who will be asking or telling you abt some
promotional offers about their products.
Tech Support executive is who resolve cutomer's technical
queries over the phone,via emails or via chat process.
Tellecalling is a process where an executive calls
customers to give an information about the product , to
sell the product or to genrate a lead. Backend is a very
different process from voice where an executive needs to
work on excel sheets.