If you’ve spent any amount of time exploring business communications, you’ve probably heard the phrase ‘SIP trunking’ or ‘SIP trunk’ – it’s pretty common in the rapidly expanding telecommunications world. In fact, more than 80% of large businesses say that SIP is important to their business.  SIP trunking is scalable, universal, and allows users to streamline connectivity – all while reducing costs and improving performance.


First of all, what is SIP?

SIP (Session Initiation Protocol) is a signaling protocol used for the real-time delivery of voice and media.  With the right infrastructure and interconnections in place, SIP

Instead of carrying calls across potentially thousands of miles of copper wiring to get to the destination, SIP permits voice traffic to be carried over data networks, including the internet.

So, what is SIP Trunking?

Trunking is a term to describe the process of transferring a call between origin and destination – in this case using SIP.  AKA, voice data is transferred through your company’s organization using your PBX, sent to your SIP providers’ network through a SIP Trunk and then delivered to the destination – another phone or a computer!

Why is SIP Trunking good for business communications?

The advantages of SIP Trunking are countless.  Here are a few of the benefits to SIP Trunking:

  • Unlimited Call Capacity

SIP trunking allows for unlimited, simultaneous call capacity so you can enjoy as many calls to and from a single number as you’d wish! This is a huge benefit for customer contact centers that receive dozens, or even hundreds, of calls a day to a centralized phone number.

  • Local Presence

Because the phone numbers associated with SIP are virtual, they do not need to be tied to your physical location.* This means you can use DID numbers and SIP trunks for a two-way voice service that lets you conduct business from anywhere you want to work!

  • Centralized Comms

If you have multiple business locations, SIP trunking eliminates the need for individual telephone lines at each location, consolidating all branches or offices and creating a single, centralized platform. This results in reduced hardware needs and impressive long-term cost savings.

  • Scalability

SIP trunks are extremely flexible, allowing you to scale your communications system on-demand as your business grows. You can easily deploy voice services and additional capacity as and when you need it, in offices around the world, without ever having to invest in costly infrastructure.

*Local regulations may require your phone number to be associated with your physical location.  A Call One expert can partner with you to help understand more about local regulations and how they can affect your business communications.

Now you know what SIP Trunking is and why your company should seriously consider it!

Call One product managers and sales engineers are on hand to work with you to discover exactly how SIP Trunking can be designed to work for your company and how Call One can deliver to you!


This article was written by Siobhan Glenn, Digital Marketing Manager at Call One.  For more information about Call One solutions visit www.callone.com/solutions.

Siobhan Glenn