Fact to know about DID Number Setup

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DID Number offer a service to connect a clients' private branch exchange (PBX, in charge of changing the calls to the best extension) system to the PSTN (Public Switched Telephone Network, or the traditional telephone network, which does not utilize the Internet during a telephone call). DID personal number are connected with a SIP (Session Initiation Protocol, which is in charge of making, terminating and maintaining the connection between two conversation partners) gateway that connects them to both the PSTN and the Internet.
 
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