There are many benefits in migrating to Session Initiation Protocol (SIP) trunking from the PSTN, but the biggest benefit by far is cost savings. The amount of SIP trunking cost savings will vary greatly depending on how distributed an organization is and how many PSTN trunks are currently in use. But the key to cost savings isn't to replicate the old telephony architecture with SIP trunks and leave everything else the same.
Consider a business that has 10 locations, for example. It's likely that two PSTN trunks are deployed to each location to ensure redundancy of the service. With SIP trunking, the company could simply buy and deploy two Digital Signal 3 SIP trunks in the data center to carry the entire organization's outbound VoIP traffic across the WAN and out of one of the centralized SIP trunks.
The consolidation of trunks alone can save companies up to 50% of what they were paying for legacy trunks. There are also a number of operational cost savings, as well as decreasing the actual number of trunk circuits because of the consolidated circuit.
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