A SIP trunk is the use of (Session Initiation Protocol) to set up communications over the Internet between a customer location and an Internet telephony service provider (ITSP), which transfers the SIP calls to the PSTN. Unlike in traditional telephony, where bundles of physical wires were once delivered from the service provider to a business, a SIP trunk is a logical connection from one point to another over the public Internet. It is much easier and less costly to extend your system over IP. SIP trunks also reduce costs by eliminating the need for separate voice and data connections, and provides for communications convergence delivering voice and data over the same network. Furthermore, as a company grows, all necessary infrastructures to handle additional voice/data traffic are already in place. A single corporate SIP trunk account can serve an entire enterprise, no matter the size. Also, multi-site enterprises can use a single SIP trunking account rather than multiple sub PRI connections.

Check out this report about the value of SIP Trunking.

The emergence of service providers offering SIP trunks to enterprises means that enterprises can outsource their PSTN connectivity to a third party. This reduces long-distance charges, as SIP calls travel over the Internet or providers IP network to a termination point owned by a service provider, where the call is then transferred to the local PSTN. Also, instead of providing customers with an 800 number, a SIP Trunking service provider with points of presence in multiple U.S. cities can establish local numbers in each city for customers to call. Those calls can be terminated locally and placed on the Internet for delivery to the company’s call center. SIP trunks can generate a sizable return on investment and payback the upfront costs in a very short time in some cases in less than six months.

A robust enterprise solution combined with SIP trunks from an ITSP delivers the promise of global connectivity, over the Internet, long envisioned by the voice over IP pioneers.

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