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What Is SIP Trunking? A Helpful Guide

de Eleanor Manning (2018-09-29)

Businesses constantly search for solutions that reduce their cost and improve their operations. With the globalized business environment, the need to have an effective communication channel has led to the advent of VoIP technologies. Over the years, the communication infrastructure has gradually evolved and nowadays you hear different jargons that are enabling businesses to implement unified communication (UC) technology.

One of the widely implemented technologies is SIP trunking. Session Initiation Protocol or SIP trunking provides companies a channel that connects their PBX to the public switched telephone network (PSTN). It enables you to have all the communication features, such as video, voice, and data on a single location in the form of instant messaging, video conferencing, voicemails, and more.

How Does it Work?

If you are already using a VoIP solution, the next reasonable step is to figure out how you can connect it to the cloud hosting service. LAN with limited bandwidth will not support your VoIP system. The limited internet speed of your existing plan will not be enough to provide a smooth flow of communication.

This is where SIP comes. It serves as an additional feature; a direct line to your SIP trunk provider that goes past the regular internet service provider. With this technology, it is better not to use a regular internet connection if you want to get a reliable and high-quality communication experience.

SIP trunking enables the delivery of a voice call, along with unified communication features using an IP network. It provides a substitute for a traditional telephony system. By using this technology, a person can make a call to a PSTN network without any telephone lines. You can set up a connection with the help of a hosted PBX solution.

There are three things you have to look at when implementing a SIP trunking technology. First of all, you need to have a telephony system that is compatible with SIP trunking. The second is a border element that acts as a bridge and provides a connection between the PSTN and the enterprise network. Last but not the least, you need to have a reliable SIP trunk provider that offers a compatible solution for your existing systems and understands the network requirement.

These elements enable the smooth functioning of your communication infrastructure and allow you to have a good communication experience.

Advantages of SIP Trunking

SIP trunking is very beneficial for small and large companies. Given below are the key advantages it offers to a company

Cost Saving

With the implementation of this technology, companies have experienced a massive reduction in their communication cost, i.e., about 70 percent. In addition to that, it offers other features, such as instant messaging, voicemail, and video conferencing features, which enables companies to have effective communication.


SIP trunking has also been very useful in offering scalability. Instead of buying a bundle of 23 channels, you can add individual trunks, depending on your call capacity. Similarly, if you feel like scaling down, you can easily do it. It allows you to increase your decrease the system’s capacity based on business needs.


It also offers flexibility in terms of taking your calls anywhere with you. You can attend your virtual meetings on the go. In other words, no matter where you are, SIP trunking allows you to attend your virtual meetings anywhere by allowing integration of mobile devices with the system.

Offers a Disaster Recovery Plan

In case of natural disasters, this VoIP technology enables businesses to continue communicating with their clients from another location, even if all other operations get affected by that calamity. This leads to enhanced customer satisfaction, which is good for a company’s success.

Low Call Rates

SIP trunking allows you to make internal calls without any charge. As for the international and local calls, the charges are very low compared to a traditional telephony system. This makes it one of the best products to facilitate businesses when they experience growth.

All in all, SIP trunking enables you to use all the services on the same network without having to spend additional money on it. Moreover, it also cuts down the overall communication cost by eliminating the need to have a dedicated IT professional who monitors the telephony system.

ISSN 2519-7215