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SIP Trunking Implementation: Before and After Scenarios

SIP trunking connects networks directly to the PSTN, simplifying network management and reducing connection points. This series of network diagrams shows you how it’s done.


Single Location Office

Before: Office computers and telephones run on a LAN, with a data connection to the Internet and voice to the PSTN via a PBX.

After: Telephone calls are now made through the Internet, which is connected to the PSTN and out to the world via a SIP trunk. You no longer need a dedicated voice connection to the PSTN, reducing costs, simplifying network management time and maintenance, and increasing efficiency.

Multi Location Office

Before: Multiple offices connected by a data network, with each location managing its own connections to the Internet and to the PSTN through multiple PBXs. Voice and data are run over separate networks, leading to duplication of equipment and connection points.

After: An IP VPN has been deployed, improving class of service, costs and data speed transmissions across the network. That data network is then connected to the PSTN via a SIP trunk, eliminating the need for PBX connections at each office. The data network now carries voice traffic, with failover capacity via a second connection to the PSTN in case of network failure.

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