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https://bravikov.wordpress.com/2016/01/19/%d0%bf%d0%b5%d1%80%d0%b5%d0%b2%d0%be%d0%b4-%d0%b7%d0%b2%d0%be%d0%bd%d0%be%d0%b2-%d0%b7%d0%b0%d0%b4%d0%b0%d1%80%d0%bc%d0%b0/
Перевод звонков между внутренними номерами Задарма