SIP Trunking Services for Businesses

Whether you call them SIP lines, SIP phone lines, or just “the new way to handle calls” — we’ll help you upgrade without the faff. You’ll get a solution that fits the way you work, backed by real people who care and actually pick up the phone when you need them.

Ready to switch to SIP phone lines? We’ll help you get started with a quick, no-strings quote >

Still relying on old phone lines or ISDN? It’s time to move forward with SIP trunking that works for your business, not the other way around.

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What does SIP trunking mean for businesses?

With BT switching off PSTN and ISDN analogue networks by the end of 2025, now is the time for businesses to upgrade to SIP (Session Initiation Protocol) telephone lines, not only helping to save costs on calls today, but also helping to protect business communication in the long run.

Our SIP phone lines are now the most cost-effective way to upgrade, and you can benefit from a SIP trunking service with no upfront costs and handled by our industry experts at Birmingham Telecom.

SIP trunking is now the main method of making and receiving phone calls, as well as other multimedia connections, over the internet. When paired with the right business telephone systems, businesses can effortlessly unify their communications, from voice and video calls to desktop sharing, web conferencing and more.

SIP telephone lines can be ordered to carry as little as a single concurrent call but can be immediately scaled up in line with demand and without the need for additional physical line installation. There are no limits on the number of calls that can be carried over SIP phone lines.

Clear, Honest SIP Trunking Pricing

Whether you need just a few SIP lines or a full multi-site setup, we’ll give you straightforward pricing with no hidden extras. Our SIP trunking packages are built around your business (not the other way round) and always come with real support from our team when you need it.

£11

£ 9

per month

Includes 2 Channels (1 inbound, 1 outbound)
FREE UK national calls
FREE UK mobile minutes
FREE setup and connection
Save over 50%
Fails over on service interruption
Can be setup in minutes
Works on all modern phone systems
Call us today on 0121 716 8888

£15

£ 13

per month

Includes Yealink T54W SIP Handset
FREE Unlimited UK Calls
Advanced call routing
Automated attendant
Custom music on hold
Audio conferencing
Call queuing
Call statistics & wallboards
Inclusive call recording
Custom CRM integration
Call us today on 0121 716 8888

£6.95

£ 5

per month

Includes 2 Channels (1 inbound, 1 outbound)
FREE setup and connection
Save over 50%
Fails over on service interruption
Can be setup same day
Works on all modern phone systems
Call us today on 0121 716 8888

Absolutely Perfect! Would not hesitate to recommend the team at Birmingham Telecom. They have saved my life on multiple occasions. You really should give them a try.

Chris Wright

Silven Recruitment

Benefits of Switching to Birmingham Telecom’s SIP Trunking Service

Price promise

We 100% guarantee that if you find the same service cheaper elsewhere, we will either match it or beat it.

Reduced rental

Birmingham Telecom use our wholesale buying power to save you 82% against legacy phone lines.

Maintained by us

Our SIP trunking services are maintained and supported through our in-house support team.

Transparent billing

Accurate phone bills every single month and see how much upgrading to SIP phone lines can save your business.

Switch for FREE

Birmingham Telecom don’t charge anything when you switch and upgrade to SIP. No setup fee, no hidden costs.

Keep your numbers

We make the transition to SIP trunking easy, ensuring a smooth and fast transition that lets businesses keep their existing phone numbers.

In house support team

Our tech support and provisioning team are based in house so you always get to deal with the same people

Telecom experts

We are experts in our field with a 99.2% customer retention rate, always offering the best SIP trunking service.

Save up to 82% on your bills when you switch to SIP phone lines with Birmingham Telecom. Call us on 0121 716 8888

FREE and fast migration to SIP when you upgrade to VoIP telephony

Save up to 82% when compared against your existing telecom services

A simple, cost effective and flexible way to beat the 2027 BT Switch Off

Get FREE UK calls forever when you upgrade to SIP phone lines with Birmingham Telecom

What is SIP trunking and what benefits does it bring?

SIP trunking falls under VoIP (Voice over Internet Protocol) technology. SIP telephone lines connect your site directly into our network via an internet connection to carry and terminate your inbound and outbound voice calls.

Multiple SIP phone lines are referred to as SIP trunks, and the phone lines are highly reliable, more cost-effective and offer better flexibility when compared against ISDN and PSTN phone lines. With Birmingham Telecom’s SIP trunking service, your business will receive these benefits:

Make the upgrade to SIP phone lines before the PSTN and ISDN switch off

With BT’s announcement that the traditional PSTN and ISDN network will be made obsolete in 2027, our SIP phone lines will future proof your business whilst saving you up to 82% compared to your current telephone bills.

While BT is leading the switch to digital, other providers and users of PSTN and ISDN services will be impacted. Our SIP telephone lines can be installed instantaneously, scaled up or down in line with demand and are deployed without the need for additional physical line installation. Being great for flexible working practices, SIP trunking provides the ability to integrate home workers with a SIP-based phone system with ease.

Birmingham Telecom can supply you with business-grade SIP phone lines that have been tested extensively with all major telephone systems. If you are concerned about the switch, rest assured our SIP trunking service is transparent, efficient and hassle free

Work with a SIP Trunking provider that understands your business

    
 
 
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   Alan Norman 
 
 
 
 Trustindex verifies that the original source of the review is Google. Lee always shares valuable advice, nothing is too much trouble. This is a business that I thoroughly recommend. If anyone is thinking of changing their provider of their cell phone, land line this is the place to go to.
  
 
      Posted on Google  
   
   Luke Graham 
 
 
 
 Trustindex verifies that the original source of the review is Google. Great customer service! the speed of service was amazing and everything about my experience actually led me to reach out to ask where I leave a review. Top drawer!
  
 
      Posted on Google  
   
   H 
 
 
 
 Trustindex verifies that the original source of the review is Google. The Team at Birmingham Telecom have given us exceptional customer support with unwavering attention to detail. Their team go the extra mile to ensure every issue is resolved swiftly, minimizing business downtime and keeping operations running smoothly. The dedication and professionalism they show is truly impressive, making them our trusted and reliable partner for all of our telecom amd internet needs. We have been with them for over a decade and continue to recommend them as the only company to go to.
  
 
      Posted on Google  
   
   Ash Hearing 
 
 
 
 Trustindex verifies that the original source of the review is Google. So glad we found this company and so glad they are local.  It's so good to deal with local people.  Excellent customer service.  Always at the end of a phone to answer any queries.  We have three locations and we could not be more happy knowing we are in safe hands.
  
 
      Posted on Google  
   
   Ian Fowles 
 
 
 
 Trustindex verifies that the original source of the review is Google. Awesome service from a top class telecommunications provider.
  
 
      Posted on Google  
   
   Gavin Miller 
 
 
 
 Trustindex verifies that the original source of the review is Google. Great deal on Jabra headsets👍 Top quality products, 5 * Customer service
  
 
      Posted on Google  
   
   Thibault Kitchener 
 
 
 
 Trustindex verifies that the original source of the review is Google. Great business, very up to speed and competent bunch.
  
 
      Posted on Google  
   
   Brian Garrity 
 
 
 
 Trustindex verifies that the original source of the review is Google. Very helpful
  
 
      Posted on Google  
   
   Thorns Infant School 
 
 
 
 Trustindex verifies that the original source of the review is Google. Lee and the team are extremely helpful and we love our new phone system.

SIP Trunking FAQs

Birmingham Telecom are a customer-focused provider who are expert in business VoIP and SIP trunking.

We understand these technologies can be complicated, so here are some of our most asked questions on SIP trunking and phone lines. If you have any other questions or are ready to make the switch for your business, get in touch with our team to discuss your upgrade.

Can we take our phone numbers with me if we move office?

Yes.

One of the benefits of SIP Trunking and making the switch to digital voice is that you can keep your numbers when you move office (even if you are moving to a different area code)

This is because your phone number will work over the internet and not via a fixed line running into a building.

Does SIP remove the need for a telephone system?

No, SIP phone lines simply remove the requirement for ISDN or PSTN telephone lines and are simply a more efficient, more cost effective and more reliable solution to replace this old technology.

You will still need a phone system that is compatible with SIP phone lines however, the good news is that we will be involved from start to finish, providing you with all the help and advice you need.

Can we integrate SIP phone lines with my existing telephone system?

Not always.

If you have a modern IP enabled phone system, it may already support SIP but if not, we will talk you through your options, whether that is a simple adapter, a new hosted system or a hybrid setup that keeps some of your existing kit.

Do SIP phone lines save my business money?

Yes — in most cases, businesses save a large amount of money by switching to SIP.

You’ll often reduce line rental costs, get lower call charges (UK calls are included with our SIP Trunking plans).

Plus, SIP trunking is more flexible if your team or office setup changes so it is easy to either scale up or down quickly.

Is SIP trunking cheaper than ISDN or analogue lines?

Yes, as part of the ISDN and PSTN Switch off, costs of traditional analogue and ISDN phone lines have increased dramatically whilst VoIP products such as SIP trunking have become cheaper and more accessible.

So the simple answer is yes. Businesses save money by switching to SIP. You’ll often reduce line rental costs, get lower call charges, and only pay for what you essentially need.

How many SIP channels do I need?

That depends on how many simultaneous calls your business typically makes.

A SIP trunk can carry multiple channels (think of each channel as one call path). We’ll help you choose the right number to suit your team size and call volumes but typically our customers would use between 4 – 20 SIP channels depending on their size and needs.

What internet speed do I need for SIP lines?

When you upgrade to SIP trunking, you don’t actually need lightning-fast broadband to deliver good speech quality for calls, but a stable and reliable connection is very much essential.

As a rough guide, each SIP call needs around 100Kbps of bandwidth so a typical FTTC broadband connection is more than suitable for a decent number of SIP channels.

If you’re unsure, we can assess your line and recommend the best setup.

Can SIP trunks support remote working or multiple sites?

Absolutely.

SIP trunking is ideal for flexible working and it allows you to route calls to other locations, home workers, mobile phones or softphones.

You can run a single number across multiple offices, or have staff answer calls from anywhere.

How long does it take to switch to SIP trunking?

Actually setting up a SIP trunk from our side can take a matter of minutes.

The delays come with porting your existing telephone numbers and matching the SIP trunking orders. Typically, if number porting is involved, we can often have you up and running in a matter of days, depending on your current setup.

If there is no number porting involved then we can have you up and running within 24 hours on most occasions.

Whatever your requirements, we manage the whole process from start to finish to keep everything running smooth and disruption-free.

Is SIP Trunking resilient in emergencies?

Yes.

If something goes wrong or your organisation experiences an emergency, you can reroute your calls to another location using the same number until the problem is fixed.

ISDN and PSTN rely on slow, network based call diverts where our SIP trunks sit inside the cloud and can be diverted or re-routed immediately.

Ready to Upgrade to SIP Telephone Lines ?

Please complete the below simply form to register your interest and get a fast, free, SIP Phone Line quote which will be completely tailored to your business needs.

If you have any questions, need help or have a query relating to SIP Phone Lines, please get in touch with our team on 0121 716 8888

Company Name

First Name

Surname

Email Address

Postcode

Phone Number

Reason for Enquiry

Other Info

We guarantee to lower both your line rentals and call costs.
No price increases of any kind.
Unlimited UK calls included.
We will handle all aspects of switching your services to us.
We provide fully itemised, easy to understand monthly billing.
Our fraud protection service monitors your daily calls with any usage outside of the norm being identiﬁed & halted.

SIP Trunking Services for Businesses

What does SIP trunking mean for businesses?

Clear, Honest SIP Trunking Pricing

Inclusive SIP Telephone Lines

Cloud Hosted VoIP Phone System

Basic SIP Trunk

Absolutely Perfect! Would not hesitate to recommend the team at Birmingham Telecom. They have saved my life on multiple occasions. You really should give them a try.

Chris Wright

Silven Recruitment

Benefits of Switching to Birmingham Telecom’s SIP Trunking Service

Price promise

We 100% guarantee that if you find the same service cheaper elsewhere, we will either match it or beat it.

Reduced rental

Birmingham Telecom use our wholesale buying power to save you 82% against legacy phone lines.

Maintained by us

Our SIP trunking services are maintained and supported through our in-house support team.

Transparent billing

Accurate phone bills every single month and see how much upgrading to SIP phone lines can save your business.

Switch for FREE

Birmingham Telecom don’t charge anything when you switch and upgrade to SIP. No setup fee, no hidden costs.

Keep your numbers

We make the transition to SIP trunking easy, ensuring a smooth and fast transition that lets businesses keep their existing phone numbers.

In house support team

Our tech support and provisioning team are based in house so you always get to deal with the same people

Telecom experts

We are experts in our field with a 99.2% customer retention rate, always offering the best SIP trunking service.

Save up to 82% on your bills when you switch to SIP phone lines with Birmingham Telecom. Call us on 0121 716 8888

FREE and fast migration to SIP when you upgrade to VoIP telephony

Save up to 82% when compared against your existing telecom services

A simple, cost effective and flexible way to beat the 2027 BT Switch Off

Get FREE UK calls forever when you upgrade to SIP phone lines with Birmingham Telecom

What is SIP trunking and what benefits does it bring?

Make the upgrade to SIP phone lines before the PSTN and ISDN switch off

Work with a SIP Trunking provider that understands your business

SIP Trunking FAQs

Ready to Upgrade to SIP Telephone Lines ?

Save Money

Switch Provider

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