The system of Classes of Service (COS) helps defining rights for one or another extension in the PBX or Centrex systems. For example, few groups require more space for storing voice messages, while other need the redirection of calls to cell phones, the third does not have to make calls outside of the office network. With the help of this system one can change and configure settings.
Company Alphatalk Communications (HongKong) is created in 2001. The basic purpose of the company - development of a perspective direction of transfer of the traffic between Russia and the countries of the Asian region.