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SIP Trunks provider in the UK

Reliable connectivity for your onsite phone system

Connect your VoIP compatible onsite phone system and save on line rentals and calls. We can also interconnect hosted PBX with your onsite system, provide 03/0800 numbers via SIP trunk and offer inbound numbers from other countries.
View rates & plans

UK map UK based service infrastructure
Up & down arrows Inbound and outbound
caller ID support
Handshake Risk free
14-day trial
Headphones Support for SIP protocol
Number porting Number porting. Port your numbers in or out.
Bill Prepaid and postpaid billing models
Gears Assistance with configuration of your PBX
Gears G.711 (alaw or ulaw), G.729, G.722 codecs

SIP trunk rates & plans

SIP Talk Unlimited
SIP Trunk with
Unlimited* calls to
UK numbers
* Fair use policy applies
per channel /
per month   £24.99 inc VAT GBP
compatible
Microsoft Teams
View
  • Including UK Landline (01, 02, 03, 056); UK Mobile (O2, 3, Vodafone, EE, Orange, Virgin mobile) and UK 0800, 0808 numbers
  • Bonus offer:
    Free unlimited* calls to 50+ countries >
SIP Trunk with
Low monthly fee
and rated calls
per channel /
per month   99p inc VAT GBP
compatible
Microsoft Teams
View
  • Guaranteed high quality caller ID enabled routes

Call plans listed here are designed for general business use. Calls to 0800 or 0808 are free. Calls to UK-wide 03 geographic numbers are rated at the same rate as calls to any other geographical number.

Call Plans

inc VAT
UK landlines (01, 02, 03, 056) Rated per second. 1p min charge.
UK mobiles (O2, 3, Voda, EE, Orange, Virgin mobile) Rated per second. 1p min charge.
UK 0800, 0808
Minimum monthly spend to UK destinations
SIP TRUNK Basic Business
1p p/min
4.75p p/min
0p p/min
£0.00
SIP TRUNK 25 Business
0.95p p/min
3.6p p/min
0p p/min
£25.00
SIP TRUNK 100 Business
0.90p p/min
2.9p p/min
0p p/min
£100.00
SIP TRUNK 250 Business
0.85p p/min
1.9p p/min
0p p/min
£250.00

High call volumes?

We love competing! Please have a look at our special rates for call centres
or give us a call, tell us about your call volumes and we will provide you with an unbeatable offer.

SIP Trunks for call centres Contact us
SIP Trunk Critical Information Summary

International Call Rates. Any unused call credit will rollover to the next billing cycle. In order to use the rollover value, the account must have a positive balance. A change of call plan will result in the loss of the unused rollover value. Published rates are per minute but billed per second. 1p minimum call charge apply. Call charges are rounded up to three decimal places.
Prices are in GBP inc. VAT.

Advanced functionality

SIP trunk service is part of our PBX system. This enables some unique features to be configured that are not normally available for SIP trunk services.
bolts
VoIP failover
SIP Trunking
SIP Microsoft Teams Compatibility
Microsoft Teams PSTN gateway
Integration between onsite and Hosted PBX systems
Automated failover in the event of internet outages
SIP aggregation of traffic from multiple VOIP carriers into one central system.
Compatibility with Microsoft 365 and Microsoft Teams
Terminate calls via your our Microsoft Teams PSTN gateway

SIP trunk object within PBX can be configured in two different modes:

Diversion to SIP URI
This mode is useful if you want to send a call to the specified SIP address. SIP URI must be in the following format:
<remote_number>@<remote_server>:<port>
example: 443333051330@sipserver.com:5060 or 443333051330@111.22.33.44:5060.
Create SIP registration
Register your SIP Server with us (e.g. connect your PBX to us).
Enjoy low VoIP rates and complete integration between your onsite and hosted PBX systems.
Your PBX will be able to call users on our system or dial out to the world and PBX users will be able to call extensions on your PBX.

Get your FREE account today and try it for yourself

SLA Guaranteed uptime of 99.9% for your mission critical business phone system



Find out why our
customers like us
Current Service Status
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uptime
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SIP trunking

Frequently asked questions

  • What is the difference between SIP trunking and hosted PBX?

    It’s not about the difference between them but how these two services cooperate with each other. SIP trunking is a service that allows you to connect your VoIP compatible onsite phone system to the cloud to have a connectivity with the outside world. Hosted PBX is already a telephony system that operates via the Internet but you can interconnect them to use some of the hosted PBX features with SIP trunking, e.g. provide an inbound toll-free number or record calls.

  • What are the benefits of SIP trunking compared to PSTN and ISDN?

    SIP trunkng replaces older PSTN and ISDN phone lines and uses the Internet to transmit voice data. Key benefits of SIP Trunking are:
    - Lower cost compared to older PSTN and ISDN connections;
    - Ability to easily scale up or down with the number of channels or simultaneous calls required;
    - It is also easy to relocate as you could use your SIP Trunk anywhere you can get access to the Internet;
    - SIP Trunk can be configured to encrypt all voice data before transmission and allow for HD voice codes with significantly better voice quality to be enabled.

  • What are SIP trunk channels?

    A SIP channel is used for one incoming or outgoing call. You can think about it as a sort of a standard phone line. Every SIP trunk can support multiple SIP channels.

  • How many channels can a SIP trunk handle?

    Number of channels supported by SIP Trunk is limited by your Internet connection speed, but most of the modern broadband connections are capable of supporting dozens of channels. E.g. 10 Mbps connection could support about 100 simultaneous calls.

  • How fast Internet connection is needed for a good SIP trunking operation?

    This depends on your onsite PBX and its supported codecs. If your PBX supports G.729, you only require 0.03 Mbps including overheads. Therefore, if you have a reliable connection of even 8 Mbps, you could have about 260 simultaneous calls connected. However, quality of calls will highly depend on the reliability of your internet connection, so it does not have to be very fast but it must be reliable and stable.

  • What happens if my Internet goes down?

    Even if your Internet connection goes down, you'll still continue to receive inbound calls. This is possible thanks to diversion of calls to mobile phones. How it works: commonly a call is coming to the inbound number and then passes to SIP trunking. In case there’s no connection with the SIP device due to lack of internet connection, a call will transfer to mobile phone or any other phone number you will configure.

  • Why is there a minimum monthly spend?

    We offer lower rates for larger call volume accounts. For services with minimum monthly spend we deduct the minimum monthly spend amount on the 1st of each month and this amount becomes call credit on your account. There are no extra charges for calls up to the minimum monthly spend, calls over are charged at the call plan rates.

Let's talk
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Chat with us or call us on 0333 3051 330 to speak with one of our friendly staff.

We also offer the following services to cover your most demanding requirements

Freephone/UK-wide services

Freephone /
UK-wide numbers

Visit Freephone/
UK-wide services page

A professional image
does not have to be expensive.
Get your toll-free number today!

International inbound phone numbers

International inbound
phone numbers

View more info

Connect phone numbers from over 50 countries around the world. Make it easier for your overseas customers to reach you.

Voice Artist

Voice Artist

View more info

Impress your clients with
professionally recorded greetings.

Number Porting

Number Porting

View more info

Number porting supported.
Keep your existing phone number
wherever you go.

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Number Porting

Keep your existing number

Porting your number to VoIPLine Telecom gives you the flexibility to move anywhere while still keeping the same number.
We support number porting from all major UK carriers.
While the number remains in active service and belongs to you it can be ported away to any other carrier.

In order to start your Number Porting application please sign into your account and click Porting TAB or sign up for your 14-day free trial

or

Local Number Porting

Porting fee (per number)£24 *
Maximum fee for a number range£120 *
Monthly hosting fee (per number per month)£0.60 *
Resubmission fee £24 *
* Please note - local number porting includes 01, 02, 03 prefixes.
Prices are inclusive of VAT.

Details: Porting of services from other carriers supplying PSTN, ISDN or VoIP services. Multiple numbers can be ported at the same time for a maximum one off charge of £120. Numbers must be on the same account and on the same porting application.
If incorrect information is supplied on the porting application and your porting is rejected, resubmission fee(s) will apply.
Prices in GBP inc VAT.

Toll-Free (0800/0808) Porting

Porting to VoIPLine from another carrier£24 *
Porting out from VoIPLine to another carrierFree 
Resubmission fee £24 *
* Please note - all prices are inclusive of VAT.
Information about available monthly hosting plans is published here.

Details: If incorrect information is supplied on the porting application and your porting is rejected, re-submission fee(s) will apply.

Mobile Numbers

Porting to VoIPline from another carrier £12.00
Porting out from VoIPLine to another carrier £0.00
Rejection fees: Mobile numbers £12.00
Note: Porting charges are once-off fees, and monthly subscription fees apply per mobile number. Each ported number must be linked to an active service or subscription after porting in order to stay connected.
Prices in GBP inc VAT;

Porting of Overseas Numbers

We support number porting in many other countries. For pricing information for porting of overseas number, please email support@voiplinetelecom.co.uk, specify the number you would like to port, origination Country and current service provider. We will then provide detailed information for porting procedures for the selected country.

Number porting

Frequently asked questions

  • What is required from me to port a number to VoIPline?
    Everything is quite simple. All you need is to submit an application in customer portal: fill data in fields, e.g. name of the former provider (losing carrier), your account number there and which numbers you want to port to VoIPline. Also, you will need to attach a recent invoice from the losing carrier in any convenient format: image or PDF — it will prove that you actually possess a number(s). That's all, the rest of the work will be done by our porting team.
  • How long does it take to port a number(s) to VoIPline?

    Our porting team works every business day and operates all porting applications they get on the same day but there are some factors that affect the porting speed.

    First, it's required to get a response from the losing carrier: the faster he responds, the faster the porting will be. Also, it depends on the type of the number: geographic, toll-free or mobile — toll-free and mobile are much faster than geographic numbers due to peculiarity of telecommunication systems.

    Overall, average porting time for toll-free and mobile numbers is up to 3 business days, up to two weeks for a single geographic number and up to 4 weeks for a number range.

  • Is there any outage for the number work during the porting?

    No, there's no outage during the porting process. Before the actual port of the number to VoIPline Telecom the number will continue to work with the previous provider. The cutover day usually happens at night to minimise the chance of any disconnections: you wake up and the number already works with a VoIPline Telecom.

    Also, we allow you to add the porting number to your call flow before the cutover day. Configure it for required users, queues, call recordings and so on. Once the porting happens, the number will start working the way you configured it before — it's very convenient.

  • Why a rejection can happen?
    A porting rejection most often happens because of inattention. It is very important to provide all details correctly, without typos and so on. When we will pass the porting information to the losing carrier, he can reject it because of the typo in the account number or phone number. Even though our porting team checks the provided invoice with the data in the application, it's still recommended to double check all details before submissions. This way you can not only reduce time porting but also save money.
Let's talk
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If you have any other questions about the porting process, feel free to contact our support team

Have special requirements?
Let us tailor a solution to suit your needs

We’d be happy to give you a call and go through your requirements. Once we understand your needs, we will provide you with a detailed quotation. We can also create custom call plans, integrate with third party systems and customise the setup to create a custom solution based on your requirements.

You have successfully submitted your enquiry. We will endeavour to get back to you as soon as possible

Or sign up to start your
Hosted PBX 14-day free trial today!

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0333 3051 330
Locally based UK service infrastructure
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VoIPLine Telecom LTD
Company Reg No. 10756608|VAT Reg No. 274 4849 65
Unit 4, Silverdown Office Park, Exeter Airport Business Park
Exeter, EX5 2UX
United Kingdom
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