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.
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United States 1294 India 440 United Kingdom 425 Canada 348 Bangladesh 338 China 142 Pakistan 134 Australia 133 Spain 123 Russia 114