What is SIP Trunking?

First off, what do we mean by trunking? With tradi-tional a PBX, the enterprise leases a high-capacity,
multi-call phone line—a trunk—that connects the inter-nal phone system to the outside world via the public
switched telephone network (PSTN). A traditional trunk is a service offered by the plain old telephone
service (POTS) carrier-provider and is based on time division multiplexed (TDM) technology.
A SIP trunk, in contrast, uses Internet protocol (IP) tech-nology to provide the connection to the outside world.
So, SIP trunking is a service offered by an Internet telephony service provider (ITSP) that connects a pri-
vate business-class phone system—such as a hard-ware-based private branch exchange (PBX), key sys-
tem, or software-based iPBX—with a voice-over-IP service network. The SIP trunking service allows the
enterprise to realize the cost-saving, technological and operational benefits of VoIP when communicating
with branch offices as well the outside world. SIP trunking can be implemented either with or without
replacing the organization’s existing voice network equipment.

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