1. Go to Finances -> Billing packs.
2. Add new billing pack. Укажите название "Виртуальные АТС", валюта = USD, все остальное по умолчанию:
Set name = "Virtual PBX".
Set currency = USD.
Save.
3. Go to Telephony -> Billing packs (Virtual PBX) -> Pricelists
4. Add a new one:
Set name = "1".
Save.
5. Go to Telephony -> Billing packs (Virtual PBX) -> Pricelists (1) -> Prices.
6. Add a new one:
Set price = 1
Save.