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Deciding between a centralized or distributed session initiation protocol (SIP) service deployment depends largely on an organization's unified communications (UC) architecture and infrastructure, as well as the layout of the business as a whole.
As the name suggests, a centralized SIP trunking deployment model consolidates all of an organization's telephony trunks, telephone numbers and direct inward dialing (DID) into a single location. Under this model, businesses can manage a single instance of their UC platform. This centralized SIP trunking model puts administration in a single place, but also requires highly reliable wide area network links to connect remote sites to this shared instance.
Distributed, or decentralized, SIP trunking deployments are the advanced successors to traditional telephony trunking services. Under the distributed model, SIP trunks can be dynamically deployed to any of the organization's sites. This approach makes sense for businesses that have on-premises platforms deployed throughout the enterprise or are seeking an extra level of branch survivability at remote sites.
The current distributed SIP service offerings allow businesses the choice of decentralizing their UC architecture, while still maintaining centralized management. Administrators can still treat a distributed SIP service as a unified whole, including the sharing of minutes and routing numbers to the location that needs them.
Ultimately, there is no one-size-fits-all approach to SIP trunking. Instead, SIP services are available to align with the UC architecture that best fits the business and its objectives.
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