Classes of Service

Classes of Service

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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Grandstream GXP2200

Grandstream GXP2200Grandstream GXP2200 is the first desktop IP Phone from Grandstream running on Android operating system.

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China Whoch Software & Technologies Ltd

we are selling a cheap and low rate interntional card, users can achieve phone to pc function and free calls ,welcome to contact us.

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