SIP Trunks: Everything you need to know

Whether you’re a small business owner, IT professional, or telecom manager, we’ve got you covered with all the information you need on SIP trunks and how they can benefit your business.

So what are SIP trunks? Simply put, SIP trunks are virtual phone lines that use the internet to connect phone calls. SIP (Session Initiation Protocol) is a digital phone service that replaces traditional ISDN phone lines used by businesses with an onsite PBX phone system, reducing monthly operating costs-from line rentals and call charges.


There are many benefits to using SIP Trunks.

  • Cost savings: SIP trunks can be significantly less expensive than traditional phone lines because they use the internet to transmit calls. This can be especially beneficial for businesses that make a large number of long-distance, mobile or international calls.
  • Flexibility: SIP trunks can be easily configured and reconfigured to meet the changing needs of your business. This allows you to scale your phone system as your business grows.
  • Improved reliability: SIP trunks are less prone to disruptions and outages than traditional phone lines, making them a more reliable choice for businesses.
  • Enhanced features: Many providers of SIP trunks offer a variety of enhanced features, such as call forwarding, virtual receptionists, and voicemail, to help businesses improve their customer service and productivity.
  • Easy integration with other systems: SIP trunks can easily be integrated with other systems and technologies, such as customer relationship management (CRM) software and virtual private networks (VPNs). This allows businesses to streamline their operations and improve efficiency.
  • Improved call quality: SIP trunks can offer improved call quality compared to traditional phone lines because they use the internet to transmit calls. This is especially important for businesses that rely on clear communication with customers and clients.
  • Enhanced disaster recovery: SIP trunks can provide a backup solution for businesses to ensure they can still make and receive calls in an outage or disaster. This can help businesses stay operational and continue serving their customers.
  • Increased mobility: SIP trunks allow businesses to make and receive calls from anywhere with an internet connection. This is especially useful for businesses with remote employees needing to make and receive calls while on the go.

Overall, SIP trunks offer a cost-effective and reliable business phone solution that can help businesses improve their operations, profit margins and customer service.

If you’re interested in learning more about transitioning to SIP trunks and how they can benefit your business, don’t hesitate to contact us.

  • Significant cost savings

    SIP trunking can be more cost-effective than traditional phone lines or ISDN, as it allows businesses to pay for only the capacity they need and eliminates the need for expensive hardware. This can be particularly beneficial for businesses with a high volume of mobile, long-distance or international calls, as SIP trunking can reduce these charges.

  • Integrated voice and data

    SIP trunking also reduces costs by eliminating the need for separate voice and data connections and expands the potential for communications convergence using both voice and data together. As a company grows, all necessary infrastructure to handle additional voice/data traffic is already in place. This gives companies of all sizes a streamlined, cloud-hosted phone system that combines different advanced communication features.

  • Easier maintenance and scaling

    Because SIP trunks are virtual rather than physical, scaling and maintenance are much more manageable. With legacy telephony, increasing capacity requires purchasing additional physical lines from the phone company. SIP trunks, however, can be easily adjusted with a change to the software configuration. SIP trunking allows businesses to quickly scale their phone capacity up or down as needed without needing expensive hardware upgrades or installations. This can be useful for businesses that experience seasonal call volume fluctuations or are expanding or downsizing.

  • Greater reliability

    SIP trunks are extremely stable, because as virtual lines they are not susceptible to local power outages resulting from weather events or equipment failure. The technology also allows call to be routed to pre-determined locations if a primary office location goes offline for any reason. Considering even a few minutes of downtime can cost a business thousands of pounds, business continuity is a major advantage of SIP trunking.

Supported PBX platforms