SIP Trunking: A Basic Overview

SIP as an enter button in a keyboardLegacy voice communications systems are out the window. Gone are the days of public-switched telephone networks (PSTN). Businesses now use and focus more on Session Initiaton Protocol (SIP) technology, which makes internet telephony faster, more efficient, and more convenient. But, what is a SIP trunk line? What is this technology exactly?

Looking into the Technology

A SIP trunk refers to a direct connection between your company or business and your Internet telephony service provider (ITSP), the entity that facilitates your virtual communication needs such as instant messaging and video calling. What the trunk does is it allows you to extend the capabilities of your voice over IP (VoIP) telephony outside of your own firewall. Even better, SIP trunking does not need an IP-PSTN gateway. In simpler terms, it removes the middleman in a transaction — the middleman being the gateway between you and your ITSP.

One key difference to note between PSTN and SIP is that the latter uses physical wires while the latter uses the internet. Thus, it is easier to connect one or more numbers to your business’s PBX among other things.

Gauging Its Benefits

So, why is SIP trunking preferred over PSTN?

There are a lot of reasons for this. Primarily, the cost is much lower when using SIP. Designing a network is also easier with it, because of its simpler structure and scalable architecture. Additionally, reliability is a major selling point of it. If a phone line gets cut, PSTN systems suffer from downtime and take much longer to restore. On the other hand, with SIP, the connection could easily be rerouted. It is also important to note that SIP is NOT location-based, meaning if you move offices, you can still keep the same number. This alone makes it invaluable for businesses.

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With SIP, businesses can adapt better and scale faster to the growing needs of their respective industries.