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Tandem private network system solution
In the private network system, if a unit in a place calls a call from a unit in a place B, the system internal telephone tandem function can be used to save costs: first dial the exchange of the unit in the system in place B, and then transfer or second-dial to the phone of other units through the exchange, Make long-distance calls only pay local calls.
Tandem + Mobile Virtual Network Solution
Application conditions: the switch of the user unit must have The operator's 2M dedicated line access, the mobile phone must have a virtual network, and the two are the same operator (both mobile companies or both Unicom companies.