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.
Keen to stay in touch with business partners or clients from other countries? The first thing to do is to buy a virtual phone number from telgo. This way you will be able to expand your horizons and to boost your profits.