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.
Cyber Tel
Cyber Tel Communication is one of the first voice over IP(VOIP) providers in Tehran-Iran.
Our company started out by providing phone to phone international calling services and has since expanded its operation to incorporate the latest technologies in
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