Incoming outgoing tariffs software: Free Internet Content Logger, A suite of utilities for Microsoft Exchange, Record and save many hours of phone calls and more.
VTA is a system that enables VoIP Telephony operator to see a current state of calls, both - successful and failed. Information about traffic is generated in off-line mode. That means balance is calculated after a call termination. If any of the conditions are broken, then a system reacts according to the specified settings. If a balance of an operator-partner is lower than the allowed limit, VTA blocks access from operator-partner's IP address.
