Telephone lines

Telephone lines

Telephone lines are the foundation of your business telephone system; whether they be SIP or ISDN lines. Keeping your business connected couldn’t be simpler with our telephone lines packages – all of which are supported by a highly-skilled group of UK-based support staff and engineers.

SIP Trunks

SIP (Session Internet Protocol) Trunking is a service that allows your business to make calls over your IP connection. It facilitates most unified communications (UC) essential to modern business: voice, video, streaming, and web conferencing.


Why should your business use SIP Trunks?

  • Reduce call costs
  • Save on network costs
  • Always keep the same number
  • Look local
  • Business continuity
  • Quality


CONTACT US NOW To Get FREE fibre broadband for 12 months when you take SIP Trunking

ethernet-iconSIP Trunking eGuide

Find out how a move to SIP telephony could improve your flexibility and cost-efficiency. Download our SIP Trunking eGuide to learn more about the savings your business can make from SIP adoption.

SIP Trunking costs and savings eGuide

If you haven’t moved to SIP telephone lines, you could be wasting money

Find out how to calculate the true cost savings of SIP trunking. The only way to calculate the benefits of SIP trunking is to fully understand how much your existing system is costing you.

This eGuide will help you to understand:

  • The secondary costs that add to your bills
  • The capital and operational costs associated with maintaining a legacy system
  • The lack of flexibility, responsiveness and resulting impact on customer experience

Only once you are fully informed, can you make a fair decision about your telecoms provisions.


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Business Phone Lines and Call Packages

SBL Group can provide business calls and lines packages that are tailored to meet the specific communications requirements of your business.

We can offer you a full range of services at highly competitive tariffs to save your business money.

Whether you need us to arrange the installation of new lines or want to transfer your existing services, SBL Group makes everything quick and easy with no disruption to your business operations.

Contact us for a free no obligation audit or quotation for your business calls and line costs.


ISDN is a business-only digital Voice service which improves the clarity and quality of calls. SBL Group offer two variants of ISDN – ISDN2 (2 channels) & ISDN30 (between 8 & 30 channels) both of which provide crystal clear telephony, which means you have the capability to make or receive 2, or between 8 and 30 concurrent calls.
ISDN runs on a standard 12 month contract, with competitive call rates, no small print and no minimum spend, unlike some of our competitors.

It is free to transfer your existing service to us, and you can benefit from the low channel rental and low call costs 10 working days from your order being confirmed. During the transfer process there is no downtime, and no change to the physical aspects of your service. You are able to make and receive calls as normal, and there will be no changes to your phone numbers.

  • High quality digital voice service for businesses of all sizes.
  • No call connection fees or minimum call charges on any phone line or mobile line. All calls billed per second, and there is no minimum call spend
  • Free transfers, with no service disruption or downtime and no need to change any of your phone numbers
  • 12 month contract
  • Award-winning Customer Service and Technical Support, with an option for 24/7/365 Support available
  • Direct Dial In Numbering, so all staff and departments can be contacted directly
  • Always on connections, providing fast and secure communications.
  • Paperless billing as standard.

Contact US for a free no obligation audit or quotation for your ISDN requirements.

Want to know more?

We would love to hear from you!

ADDRESS - Head Office

SBL Group Ltd, Kingsley Hall, 20 Bailey Lane, Manchester Airport, Manchester, M90 4AN


+44 (0) 3333 209 123



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