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SIP Trunking

Route your business calls more flexibly, without being tied to a single provider.

Talk to our SIP trunking experts

What is SIP trunking?

SIP trunking is a way for businesses to make and receive calls over the internet, connecting their phone system to the wider telephone network without relying on traditional lines.

Instead of using fixed infrastructure, SIP trunks provide a virtual connection between your business and your telephony provider. This allows calls to be routed more flexibly, supports modern cloud-based systems and makes it easier to scale as your business grows.

SIP trunking services can be used with hosted telephony, Microsoft Teams phone systems and contact centre platforms, forming the connectivity layer that enables voice communication.

We help you assess your requirements, compare SIP trunk providers and choose a solution that delivers the right balance of cost, performance and flexibility.

Talk to our SIP trunking specialists

What is SIP trunking?

SIP trunking is a way for businesses to make and receive calls over the internet, connecting their phone system to the wider telephone network without relying on traditional lines.

Instead of using fixed infrastructure, SIP trunks provide a virtual connection between your business and your telephony provider. This allows calls to be routed more flexibly, supports modern cloud-based systems and makes it easier to scale as your business grows.

SIP trunking services can be used with hosted telephony, Microsoft Teams phone systems and contact centre platforms, forming the connectivity layer that enables voice communication.

We help you assess your requirements, compare SIP trunk providers and choose a solution that delivers the right balance of cost, performance and flexibility.

Talk to our SIP trunking specialists

The benefits of SIP trunking

SIP trunking gives your business more control over how calls are routed, managed and paid for.

Cost savings

Reduce the expenses associated with traditional phone lines, and achieve a rapid return on your investment, with increases in productivity and reach.

Versatility

Create a local presence with customers around the world using geographic numbers that support long-distance calls.

Mobility

Empower your employees to stay productive wherever they are in the world, with access to internet-based calling solutions that can route calls to mobile devices.

Simplicity

Reduce the demand on your IT team with a system that’s simple to manage and control. SIP trunking even offers excellent protection and security features.

Why choose PrimeTel?

Avoid being tied to one provider for both your phone system and your calls

Many UCaaS and CCaaS platforms allow businesses to bring their own carrier (BYOC), meaning you can use your preferred SIP trunk provider alongside your chosen phone system or contact centre platform.

This gives you greater control over how your communication setup is structured.

You can retain existing carrier agreements, manage number ranges more easily and choose the best combination of software and connectivity, rather than being tied to a bundled solution.

For larger or more complex organisations, this approach can improve resilience, support international requirements and deliver better commercial outcomes over time.

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Testimonials

What are customers saying?

“My team was extremely impressed by how proactive and supportive PrimeTel were throughout the process. They offered us reliable, genuine expertise, and always went above and beyond to answer our questions. PrimeTel really made the whole experience feel streamlined, and easy.”

Shaun McKiernan Operations Manager at Thompsons Solicitors

“Working with PrimeTel was straightforward and genuinely valuable. They quickly understood what we needed, guided us through the options, and kept the process moving, helping us secure the right solution commercially and operationally. I’d happily recommend them to other organisations looking for a trusted technology advisor.”

Matt Philpot IT Manager at MJ Allen

“PrimeTel really went above and beyond to find a solution tailored to our specific needs. They made it easy to negotiate with our new vendor and ensured we could implement the new technology quickly.”

Justin Paton Head of IT at Venn Group

Frequently asked questions

What is SIP trunking and how does it work?

SIP trunking is a method of delivering voice calls over the internet using Session Initiation Protocol (SIP). It connects your business phone system to your telephony provider without the need for traditional physical lines.

In practice, SIP trunks act as virtual phone lines, allowing multiple calls to be handled simultaneously over a data connection. This makes them more flexible and scalable than legacy infrastructure, while also supporting modern communication platforms such as hosted telephony and Microsoft Teams.

What are the benefits of SIP trunking for businesses?

SIP trunking offers several key benefits, including cost savings, scalability and flexibility.

Businesses can reduce call costs by accessing more competitive tariffs, scale capacity without installing new infrastructure and support remote or multi-site operations more easily. SIP trunking also enables integration with cloud-based platforms, making it a key component of modern communication systems.

How do I choose the right SIP trunk provider in the UK?

Choosing the right SIP trunk provider in the UK requires evaluating factors such as call quality, reliability, network coverage, pricing and support.

It’s also important to consider how well the provider integrates with your existing or planned communication platform, whether that’s hosted telephony, Microsoft Teams or a contact centre solution.

A structured comparison helps ensure you select a SIP trunk provider that delivers consistent performance and long-term value.

What is a business SIP trunk and when should it be used?

A business SIP trunk is designed to support organisational communication needs, allowing multiple concurrent calls and integration with business phone systems.

It is typically used by companies that require flexible, scalable voice connectivity, particularly those using cloud-based telephony platforms or operating across multiple locations.

What is BYOC (Bring Your Own Carrier) and how does it relate to SIP trunking?

BYOC, or Bring Your Own Carrier, allows businesses to use their preferred SIP trunk provider alongside a UCaaS or CCaaS platform.

Instead of purchasing bundled calling services from a platform provider, businesses can separate the application layer from the connectivity layer. This provides greater flexibility, allows existing carrier agreements to be retained and can improve cost control.

BYOC is particularly valuable for organisations with complex requirements, international operations or existing telecom contracts.

Can SIP trunking support Microsoft Teams and hosted telephony systems?

Yes, SIP trunking can be used to connect Microsoft Teams phone systems, hosted telephony platforms and contact centre solutions to the wider telephone network.

In many cases, SIP trunking is the underlying connectivity layer that enables these platforms to handle external calls. This makes it a critical component in modern voice communication strategies.

Contact Us

So much more than just consultancy; this is a partnership.

If you’re serious about making your investment in new tech work for you, it’s time for a conversation.

Phone:
+ 44 (0)203 890 4974
Email:
info@primetelltd.co.uk