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https://bravikov.wordpress.com/2016/03/30/%d0%bd%d0%b0%d1%81%d1%82%d1%80%d0%be%d0%b9%d0%ba%d0%b0-zoiper-%d0%bd%d0%b0-%d0%ba%d0%be%d0%bc%d0%bf%d1%8c%d1%8e%d1%82%d0%b5%d1%80%d0%b5-%d0%b4%d0%bb%d1%8f-%d0%b0%d1%82%d1%81-zadarma/
Настройка Zoiper на компьютере для АТС Zadarma