SIP Trunks Demystified: Enhance Your Business Communications

Understanding the ins and outs of SIP Trunks

It allows multiple phone calls to travel over a single network connection”.

SIP trunking is a revolutionary technology that allows multiple phone calls to travel over a single network connection. This powerful communication tool combines the concept of trunking with the Session Initiation Protocol (SIP) and the use of data networks, offering a flexible and cost-effective solution for businesses of all sizes.

In this article, we’ll delve deeper into the world of SIP trunks and explore how they can help you save money, improve communication, and scale your business effortlessly.

Understanding SIP Trunks: A Simple Explanation

At its core, trunking refers to the practice of allowing multiple calls to share the same telephone line or frequency, instead of dedicating one line per call.

SIP trunks take this concept to the next level by utilising the SIP protocol to transfer calls over data networks, such as the internet or a public switched telephone network (PSTN).

When companies like in2tel discuss SIP trunks, they’re referring to the entire call transfer process using SIP – from your organisation’s PBX system, through their network, and finally to its destination. This can occur across a PSTN or over the internet, offering a versatile solution for all your communication needs.

The Nitty-Gritty of SIP Channels

A SIP channel is essentially a unit of measurement for the bandwidth needed to transfer a call through a SIP connection.

The number of channels required depends on how many calls your business needs to handle simultaneously.

One of the key advantages of SIP channels is their scalability – you can easily add or remove channels as needed, making them perfect for businesses that experience fluctuating call volumes.

SIP Trunks vs VoIP: What’s the Difference?

SIP and VoIP are both protocols used for voice and data communications over the Internet, but they serve different purposes:

  1. VoIP (Voice over Internet Protocol) is a broad term that encompasses all voice communications made over the internet, such as a WhatsApp call using your home broadband or mobile data connection.
  2. SIP, on the other hand, is a specific protocol that enables VoIP communications to take place, acting as the underlying technology for internet-based voice calls.

Choosing the Right SIP Trunk Provider

A SIP trunk provider offers digital telecommunication services over the internet, such as converting existing telephone systems, providing hosted phone systems, or enabling software applications for communication.

Companies like in2tel specialise in SIP trunks and offer a comprehensive range of communication services, including business landlines, phone systems, and call management software – all powered by SIP trunks for high-quality, low-cost calls and features.

If you’re interested in discussing how SIP trunking can lower your phone bill or improve your communications, feel free to contact in2tel through their live chat, by calling their freephone number at 1800 91 1800, or by emailing

Reaping the Benefits of SIP Trunks

SIP trunking offers numerous advantages for businesses, such as:

  1. Advanced telephony features: IP telephony enables a vast array of telephony features that can enhance your contact centre, with features that can be quickly implemented and managed by either the provider or the customer.
  2. Unlimited call capacity: With SIP trunking, a single number can handle multiple calls simultaneously, ensuring that customers never hear a busy signal and that your office can manage high call volumes effectively.
  3. Building a presence: Since SIP phone numbers are virtual, you can choose any number without regional restrictions, allowing your business to appear local even when calling from a mobile or fixed location.
  4. Cost savings on calls and line rentals: SIP calls are generally more affordable than traditional phone calls, which can lead to significant savings on both line rentals and call costs1.
  5. Easy scalability: SIP channels can be added or removed almost instantly, providing flexibility for businesses facing seasonality, running marketing campaigns, or simply needing to adjust capacity2.
  6. Free internal calls: Businesses with multiple sites can benefit from free internal calls between offices, resulting in substantial cost savings3.


SIP trunking is a powerful communication tool that offers a plethora of benefits for businesses of all sizes.

From advanced telephony features and unlimited call capacity to cost savings and easy scalability, SIP trunking can revolutionise your business communications.

By choosing a reliable SIP trunk provider like in2tel, you can harness the power of SIP trunking and take your organisation’s communication capabilities to new heights.

About in2tel

in2tel is a telecoms carrier and solution provider with over 17 years of experience in Ireland and the UK. They specialise in delivering affordable, bespoke communication solutions typically found in large-scale enterprises. in2tel’s services cater to contact centres, sales and marketing teams, and internal departments across a wide variety of small businesses and SMEs.