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SIP Trunking: Overview

What are SIP trunks used for?

SIP trunks are used for a variety of real-time communications in different businesses. SIP is often used as the protocol when transferring the data of instant messaging and video. However, the most common use for SIP is still voice calling.

Just like when your PBX makes a call today, and calls are carried using your ISDN lines and the PSTN network, SIP connects the call from your PBX to your desired destination.

Generally, SIP trunks are identified as a major cost optimisation benefit. Rather than having to pay for costly ISDN circuits, SIP trunks are a fraction of the price. Furthermore, the scalability of SIP trunking enables businesses to only use the amount of resource they truly need – as opposed to paying for what they have installed, even if they may no longer require the services.

A major trend driving SIP adoption is the BT Openreach decision to discontinue the ISDN network by 2025. As services will no longer be supported, businesses require a replacement. SIP is the futureproof, easy to manage and cost-effective alternative to ISDN.