SIP Trunking

By replacing traditional ISDN before the planned shutdown, SIP trunks provide your business with flexible, stress free and cost-effective communications delivered over the internet. SIP Trunking from Red Rock Communications

call 0800 307 0170 and make an enquiry today.

Find out what we can do for you

Robust, cost-effective communication solutions that maximise your company’s productivity. Please fill out our contact form; a team member will be eager to assist you with your enquiry.










    SIP Trunks – Red Rock Communications

    At Red Rock we believe we are the best in the business which is why we offer a TRY BEFORE YOU BUY guarantee. This gives you the complete peace of mind that you can use the service AND test our customer experience with no commitment to carry on after 30 days.

    If that wasn’t enough, we also offer the following 2 months free of charge. Risk-free, 3 months free, and a better more reliable service. What is there not to love?

    Every business needs reliable communications to serve its customers better. Our services cover everything from hosted telephony to network cabling and all have the same goal.... to improve your communications. If you'd like to enjoy additional flexibility, reliability, and affordability, get in touch with the Red Rock Communications team and enquiry about our SIP Trunking services.


    What are SIP Trunks?

    SIP Trunking is a technology that routes your phone calls via the internet.

    Your voice and data connections are vital components of your business. SIP Trunks provide a flexible and low-cost alternative to ISDN for inbound and outbound voice calls.

    They offer a flexibility that is just not available through traditional ISDN. These old legacy style lines are much more susceptible to damage, day-to-day disturbances like moving office, and the inability to change or redirect calls.

    SIP Trunks are compatible with any phone system whether that system is analogue, digital or VOIP. This means that any business, anywhere in the UK can take advantage of the multiple benefits that SIP Trunks offer such as increased flexibility, scalability, cost-effectiveness, increased resiliency, and reduced downtime.

    By offering a far more robust voice network, SIP Trunks can provide your business with the assurance that if the worst happens and you encounter a fault, the calls can be re-routed in a matter of minutes and get you back up and running with minimal disruption for your customers.

    SIP Trunks for Small Business

    By giving your business the additional benefits that SIP Trunks offer you are making it more likely that you will not miss any calls and for a small business that can be the difference between adding new customers or not.

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    SIP Trunks also make sense financially, whenever penny matters it makes sense that a product which not only increases your efficiency, productivity, scalability, and resilience, also saves you money. Typically, a SIP Trunk is 50% cheaper than an ISDN circuit and calls are 25% cheaper. They also use your existing internet line and so require less hardware and lines into your premises.

    By allowing you to change to SIP Trunks without having the expense of changing your phone system, the argument for SIP Trunks is overwhelmingly positive. Additionally, thanks to our pricing structure of SIP Trunks, small-to-medium-sized businesses can enjoy these benefits at an affordable price.

    SIP Trunks allows all SMEs to access a simple to order and simple to understand replacement for your old ISDN lines which will future-proof your telecoms, cut back on costly line rental, and allows you to build a telecoms system that grows and scales with your needs.



    Our Standard SIP Trunk is targeted towards micro and small businesses that do not make a lot of calls but want the added benefits that SIP Trunks provide over the traditional ISDN lines. These include cheaper running costs, increased flexibility, scalability and the peace of mind of a 30 day rolling contract. This package comes with comes basic support between the hours 9-5 pm. Support is provided via phone and email.



    Our Premium SIP Trunk comes with a significant number of additional benefits over the Standard SIP Trunk and is aimed at more established businesses that make a larger amount of calls each month. The slightly higher cost of the Premium SIP Trunk is overshadowed by abundance of extra features such as 5000 UK landline minutes each month, free fraud protection and better resilience. This package comes with comes support between the hours 9-5 pm. Support is provided via phone and email.



    Our Plus SIP Trunk improves the benefits over the Premium SIP Trunk by adding unlimited UK landline minutes and enhanced resilience. Plus SIP Trunks are aimed towards business that make a large amount of calls every day and need the added peace of mind that enhanced resilience provides in the unlikely event any faults occur. This package comes with comes support between the hours 9-5 pm. Support is provided via phone and email.


    SIP Trunking FAQs

    We understand that the different telephony options available can be very confusing for many businesses and IT Managers. So, to help you make an informed decision here's a quick list of frequently asked questions regarding SIP Trunks. However, if your question isn't listed below, please don't hesitate to get in touch with our friendly and dedicated team.

    How quickly can SIP Trunks be ordered and installed?

    We can order and provision new SIP Trunks within one working day. The only caveat to this is the type of phone system you currently use and how much access there is to it. Get in touch with us today for a more accurate timeline.

    Do I need a new telephone line installed for SIP Trunks?

    No. It is actually the opposite. Traditional ISDN type lines needed an analogue line into your business. SIP Trunks use your existing or new internet line and so you can reduce and remove the amount of lines and services you need.

    Are SIP Trunks future-proofed?

    Yes. SIP Trunks have been developed and designed to work with all modern telephone systems.

    Are SIP Trunks flexible or fixed like ISDN?

    Yes they are flexible. You can increase and decrease the amount of SIP Trunks you require (depending on contract length) within a single working day. For example, you win a big project that will take 3 months and need to employ 10 new staff, we can increase the number of SIP Trunks to the required amount immediately and then reduce them back down after the project has finished.

    Is call quality an issue?

    No. As internet speeds around the UK are constantly increases, they are now fast enough to negate any problems around call quality and call dropping. There are already hundreds of thousands of businesses using SIP Trunks.

    SIP Trunk Specialists: Red Rock Communications

    We work with businesses and institutions to ensure that they receive a reliable, cost-effective communication solution that maximises the company’s productivity. Transparency is at the forefront of our operations; our staff are honest and upfront with no hidden costs or unnecessary jargon.

    Red Rock Communications has experience working with a diverse range of different clients from a wide range of industries. This includes charities and non-profit organisations. For example, we provided Hosted services and solutions to Brook, wellbeing and sexual health clinic for young people.

    Our telephony hosting service provided Brook with the ability to twin calls to mobiles to cover staff working from home whilst still being able to run a service. We provided them with guidance regarding telephony and other communication infrastructure solutions that would be suitable to their needs.

    If you’re interested in learning more about our SIP Trunk services, we have provided to companies in the past, we highly recommend viewing our Case Studies page or giving our team a call. We'll be happy to discuss how our expertise can be of use to your business.

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    Why Should You Choose Red Rock Communications for SIP Trunks?

    Communication and telephony are critical for any business, so it's of the utmost importance that you choose the right communication solution to assist you. So, what makes Red Rock Communications the ideal choice? Why should you choose us over the other hosted telephony companies competing with us?

    We firmly believe that our people are our best assets. We place a strong focus on customer service and adaptivity. Some of our core members have over 40 years of experience working in the telecommunications industry! With such a wealth of experience, you can rest assured that you’ll receive nothing but the highest levels of quality.

    Fundamental to Red Rock principles is a level of support we feel is unparalleled within the telecoms industry. All our engineers are manufacturer certified but, more importantly, are knowledgeable in a wide range of technologies. Be it network infrastructure, telecoms or just having a friendly chat over a coffee. We pride ourselves on putting our clients' interests first and are always happy to go above and beyond.

    However, don't just take our word for it. Here's what Paul Bamber from DHP Care has to say about our services; he has been our customer for four years!

    “We have been using Red Rock for some time and have been very pleased with the service. We have no down time and our systems are robust. When we need to make contact the response is always fast and effective and the guys are friendly and helpful. I would highly recommend them”

    SIP Trunks from Red Rock Communications; Make an Enquiry Today

    With no upfront costs, the first 3 months free, and flexible communications management, SIP Trunks from Red Rock Communications are a fantastic solution to ensure that your business has great reliable communication throughout your departments.

    If your telephone lines are letting you down on a regular basis and the costs don’t justify the experience, please don't hesitate to reach out to Red Rock Communications; our talented and passionate team will be happy to help.

    You can contact us by calling 0800 307 0170, or by sending an email to; a representative will be eager to assist you with your enquiry.