Solving the problem with fixing requests

There is a client who is engaged in the production of caviar. At the moment, I encountered a problem that employees do not record all applications, do not always call back on time, and thus they lose some applications and, accordingly, money. This client turned to us in order for us to select the optimal solution based on our product. You need the following functionality: 1) connect telephony to record calls, keep a record, so that data about who is calling is pulled up + the system controls obligations for calls back / missed calls (if the employee did not call back or did not dial on time, he receives a notification) 2) understand from what sources more customers come, who eventually buy something (the client orders advertising from googe, instagram, fb and there is no information which source is more effective) 3) set up the work of the warehouse, as some kind of movement constantly occurs when the fish arrives, then the caviar is mined through a long process. Accordingly, you need