SIP Trunk Call Management

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Save up to 50% on line rental costs with SIP Trunking

SIP trunking is a highly flexible, scalable, and cost-effective unified communications service that can significantly improve how your business collaborates while cutting costs.

SIP trunking delivers telephone and unified communications services over the internet, allowing businesses to replace traditional phone lines and connect their PBX system to the public telephone network via an internet connection. This highly flexible and cost-effective solution can improve communication capabilities and reduce expenses, making it a popular digital transformation service. SIP optimises data connections for voice and internet services on one line, offering flexibility and control over your telephony. Switching from ISDN to SIP is a low-cost alternative that can save up to 50% on monthly line rental costs and up to 25% on call costs

Business SIP Trunks

Maximise cost savings and scalability with SIP Trunking


SIP trunking is highly scalable, allowing businesses to easily increase or decrease their capacity to meet changing business requirements. Businesses can easily add or remove channels, depending on their needs.


SIP trunking allows businesses to connect multiple locations, making it easy to manage calls and ensure seamless communication across the entire organisation. This provides more flexibility for remote workers and helps improve collaboration between team members.

Cost Savings

SIP trunking eliminates the need for expensive hardware and phone lines, significantly reducing costs for businesses. With SIP, companies can enjoy lower call rates, reduced line rental fees, and lower maintenance costs up to 60% cheaper than ISDN lines.

Future Proof

SIP trunking allows businesses to take advantage of advanced features such as video conferencing, instant messaging, and unified communications, improving collaboration and productivity.

SIP Trunks

What is SIP?

Session Initiation Protocol (SIP) is an application layer protocol used to establish and terminate data and voice transfers, particularly in Voice over Internet Protocol (VoIP) communications. SIP works similarly to VoIP by delivering calls over the internet, and it can help overcome common pain points that business face including:

Relocating to new premises

Rationalising current infrastructure

Seeking a business continuity solution

Seasonality and scalability

Telecoms cost reduction

Home and remote working solution

Lack of management reporting

Multiple sites & decentralised communications

Next generation SIP trunks can bring your business back to the future

Openreach will switch off the UK’s PSTN network in 2025, meaning all homes and businesses using both PSTN and ISDN lines will be required to switch to digital and cloud services or risk losing their services and their business telephone numbers. We’ve already started to move all our customers to new digital solutions, including SIP trunk services.

SIP trunks are ideal for businesses of any size, from small start-ups to large enterprises and government organisations, supporting two channels up to thousands. Maintaining outdated telephony infrastructure can be expensive and limit the flexibility of your communication system. With SIP trunks, businesses can reduce their communication costs while scaling up or down according to their changing communication needs.

What are the main reasons businesses are switching to SIP trunks?

If you’re relocating your business or seeking a more reliable phone service to meet the demands of a busy office and hybrid workforce, SIP trunks offer an ideal solution. Here are some primary benefits of implementing SIP trunk technology for your business:

Businesses looking to move premises out of the local area

Companies looking for a resilient phone service

International businesses linking offices for free internal calls

Customer service-driven businesses where a local presence is important across the UK and multiple local numbers can be delivered in one single service centre

Multi-site organisations that are looking to aggregate individual site PBXs and lines into a resilient centralised solution

Businesses with seasonal voice capacity requirements where flexibility is important with no long-term commitments

FREE fraud prevention is provided with every SIP trunk

Global telecom fraud is costing businesses £29bn a year. What can you do to prevent it from happening to you? – Phone fraud affects all businesses; however, small and medium-sized organisations are at higher risk due to a lack of security, processes and training. Limit your commercial exposure to hacking, and unauthorised call spending with our fraud prevention provided FREE of charge for every Airacom SIP trunk.

Enterprise SIP Trunking
Small Business SIP Trunks

Keep things simple with SIP trunk plans offering free calls to local, national & UK mobile numbers

Airacom SIP plans with 5,000 minutes to 01, 02 & 03 local and national numbers, plus 2,000 additional minutes to UK 07 mobile numbers with our standard 36-month SIP plan. Futureproof your communications while benefiting from inclusive minutes to keep your monthly costs low with Airacom SIP Trunks.

SIP Trunking call Bundles

SIP Trunking call bundles

Airacom SIP

SIP Trunk 12

RRP £11.99

Per channel*

Call bundle includes

5,000 UK local & national minutes

Mobile minutes included



£9.99 FREE

Contract Length

12 Months / *Prices exclude VAT

Airacom SIP Trunking Call Management terms & conditions apply, billed monthly

Airacom SIP

SIP Trunk 24

RRP £8.99

Per channel*

Call bundle includes

5,000 UK local & national minutes

Mobile minutes included



£9.99 FREE

Contract Length

24 Months / *Prices exclude VAT

Airacom SIP Trunking Call Management terms & conditions apply, billed monthly

Airacom SIP

SIP Trunk 36

RRP £7.99

Per channel*

Call bundle includes

5,000 UK local & national minutes

Mobile minutes included

2,000 UK mobile minutes


£9.99 FREE

Contract Length

36 Months / *Prices exclude VAT

Airacom SIP Trunking Call Management terms & conditions apply, billed monthly

What is SIP trunking?

Understanding SIP Trunking and the main reasons to switch from ISDN to SIP

What is the difference between SIP Tunks and ISDN?

SIP trunking is a modern technology that allows businesses to make and receive calls over the internet using a virtual phone line, rather than traditional phone lines. The benefits of using SIP trunking for business are:

Airacom SIP vs hosted VoIP?

SIP trunking is a subprotocol of VoIP and utilises your legacy phone system. In contrast, our hosted VoIP solutions fully utilise voice calls over an internet connection in conjunction with all-new IP hardware technology (VoIP Phones).

Do we get free minutes with Airacom SIP Trunks?

The amount of inclusive minutes depends on which SIP plan and bundle you opt for. All Airacom 12, 24, & 36-month SIP trunk plans come with 5,000 local and national minutes to 01, 02 & 03 numbers as standard. 36-month SIP trunk plans also receive 2,000 additional minutes to UK 07 mobile numbers.

Are there any setup fees with Airacom SIP

No, we do not charge setup fees to activate your Airacom SIP trunk account.

Is it difficult to deploy SIP trunks?

Not at all. Integrating SIP trunking into a company’s phone network is often easier than deploying ISDN. Our team will take care of the whole SIP trunk deployment process for you.

Is there a limit to the number of SIP trunks?

There is no limit on the number of SIP channels available to you, and you can connect as many SIP trunks as your organisation requires.

SIP Trunk Benefits

Unlocking the benefits of SIP Trunking for your business communications

Less Disruption

SIP minimises any disruption as you can retain your existing phone system equipment.


SIP allows you never to miss a call using a web portal for automatic call diverts and routing.

Reduced Costs

A standard SIP trunk costs £7.99 per month compared to £16 per ISDN channel per month. That’s a 50% saving compared to ISDN rental.

FREE Calls

5000 local & national 01, 02, 03 minutes included with every SIP bundle, plus 2000 minutes to UK 07 numbers on selected plans.

Keep your Numbers

Easily port your existing business telephone numbers to SIP easily and hassle-free with our porting agreements.

Geographic Numbers

Operate without geographic number constraints. Keep your local numbers even if you move out of the area.

Fraud Management

Protect your business against excessive unauthorised calls or hacking with automatic call baring and alerts.

CLI Flexibility

SIP offers total flexibility to present whichever number you want your clients to see from your DDI or primary number.

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