Zero Balance

1. The subscriber makes a call.
2. If there is a shortage of funds on the subscriber's account, the call is transferred to the system.
3. Zero Balance generates an individual IVR menu for the subscriber, containing pre-recorded voice navigation and information messages.
4. At the time of an unsuccessful attempt to make a call, the system forms an individual IVR menu, providing the subscriber with a choice of services available in real time.

• pledge payment / call time credit;
• call at the expense of the called party;
• sending a “call me back” message;
• sending a “missed call” notification to the called party;

Having selected a service, the subscriber goes to the corresponding menu subsection.

IVR-menu has a hierarchical structure. The system forms the structure of the menu depending on whether certain services are available for the subscriber. Thus, the services available to the subscriber are at the top level.   

To form the structure of the IVR-menu, as well as to determine the availability and threshold of the service "Pledge payment", Zero Balance calculates the score of the subscriber based on the following indicators: 

• The term of active subscription of the subscriber;  
• The subscriber’s ARPU