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In a hybrid SIP trunk deployment model (Figure 1), some business sites (different regions) conform to a distributed SIP trunk deployment model. In this model each site has direct SIP session connectivity to IP PSTN and other sites conform to a centralized SIP trunk deployment accessing the IP PSTN through a regional headquarters site, which has SIP session connectivity to the IP PSTN .
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Identifying which remote sites should conform to a centralized SIP deployment model, and which should conform to the distributed model, will depend on various factors for each site. These factors include the number of employees, total inbound call volume, total outbound call volume, and overall bandwidth usage.
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