SIP Trunk UK / UK’s Best VoIP SIP Service Provider / UK SIP Trunking, Local VoIP Termination & Origination / Try Award-Winning UK SIP Trunk Provider Risk-Free

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UK SIP Trunking

Connect reliable, high-quality voice service to your existing PBX or phone system with UK SIP trunk service. AVOXI provides UK SIP trunking with unlimited concurrent calling and advanced business features included at no extra cost.

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Leading Brands Choose AVOXI

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Reliable UK SIP Trunking & Hosted Voice Solutions

UK SIP trunks connect businesses to safe, secure, and highly-reliable VoIP service (hosted voice). AVOXI's powerful voice network connects to virtually any PBX or hosted phone system (3CX, Avaya, MS Teams, you name it). Spend less on calls and get more in features, all managed from an easy online interface, with UK SIP trunk solutions from AVOXI. 

All the Voice Services You Need

Reliable inbound and outbound calling in the UK and abroad. Leverage cloud voice features like call routing and tracking, secure call recording, unlimited IVR, VoIP API, and many more.

Secure VoIP Network Built for Reliability

Real-time alerts on abnormal traffic with 24/7/365 manual fraud monitoring just in case. TLS and SRTP encryption ensures secure calling. 4.2 MOS Score backed by 99.995% uptime.

Unlimited SIP Trunking in the UK and Beyond

Take advantage of unlimited concurrent calling, automatically included with SIP service in the UK. Scale up or down automatically and only pay for what you use.

Lower Call Costs with Upgraded Voice Service 

No setup fees, minimum contracts, or ridiculous add-on fees. Free number porting or BYOC available. Expecting high call volumes? Ask about wholesale rates for Enterprise SIP Trunking in the UK!

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Additional Resources

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Security

Best SIP Protocols for Secure Communications

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Retain Phone Number

International
Number Porting

Learn How
SMS Strategy Delivers Global Brand Experience
VoIP Quality

Troubleshooting Common SIP Issues

See How

Buying Phone Numbers in Bulk?

Ask us about AVOXI Flex, our flexible SIP trunk solution for enterprises

and wholesale partnerships. Buy and provision phone numbers in bulk with

phone number APIs and enjoy wholesale SIP trunk rates in the UK and beyond.

Buying Phone Numbers in Bulk?

Ask us about AVOXI Flex, our flexible SIP trunk solution for enterprises

and wholesale partnerships. Buy and provision phone numbers in bulk with

phone number APIs and enjoy wholesale SIP trunk rates in the UK and beyond.

Connect Reliable UK SIP Service with Any Platform

AVOXI's VoIP SIP solutions work with any system, including 3CX, Avaya, Microsoft Teams and many more.

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Voice Termination

Reliable Outbound Voice with Unlimited Call Capacity in the UK

  • Unlimited Concurrent Calling

    High-quality outbound voice service unlimited SIP channels (concurrent calling) in the UK.

  • Local Voice Termination with UK Caller ID

    AVOXI's network is optimized for local voice termination in the UK. That means crystal-clear call quality and outbound caller ID that works every time. 

  • Make Calls to the UK & 190+ Countries

    Whether you're making local calls to the UK or connecting internationally, AVOXI provides a seamless voice experience anywhere you do business.

Voice Origination

Carrier-Quality Voice Origination Managed from an Intuitive Platform

  • Phone Number Management Simplified

    Instantly provision phone numbers from 170+ countries, configure forwarding rules in bulk, and manage multiple carriers' numbers from one intuitive interface. 

  • UK DID Numbers Available for Any Need

    AVOXI provides toll free, 03 non-geographic, mobile, and local DID numbers in the UK. Port existing DID numbers to AVOXI for free, or keep your carrier with BYOC. 

  • Advanced Call Routing & Tracking

    Take caller experience to new levels with advanced call routing and analytics. Track call trends over time, monitor SIP trunk connections with Call Insights Dashboard, automatically upload call logs into your CRM or helpdesk, and more.

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Our equipment is housed in tier 4 data centers with multi-factored, physical security

Zero Down Time (ZDU) + database replication across all regions allows AVOXI to move traffic quickly to subset of devices

Strong broadband network across data centers, including multiple internet service providers with automatic failover
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Carrier Network

Modern VoIP Network with Next-Level Fraud Protection and Threat-Monitoring

  • Highly-Reliable VoIP Network

    AVOXI consistently scores above the global standard for "excellent" call quality, backed by 99.995% uptime. 

  • Secure SIP Calling

    Your UK SIP service is protected by TLS and SRTP encryption, real-time traffic abnormality alerts, proactive fraud monitoring, and a network optimized to avoid packet loss.

  • Compliant VoIP Solutions

    Our SIP trunk platform maintains the most up to date technology available to ensure your organization's data is protected. We adhere to global security standards and privacy regulations.

What Customers Are Saying

Don't just take our word for it. See why thousands of businesses rely on AVOXI as their global communications platform.

"Easy to use, great customer support, and reasonable pricing
that can be customized according to usage."
Patricia Neo
Hyatt Corp

"In comparison to other similar services existing on the market
AVOXI definitely makes a difference on every level.”
Capucine Golicheff
BNP Paribas

”The interface is easy to use and very user friendly,
our teams required very little training to get started right away.”
Marco Rinalducci
Argos Assistance

"AVOXI makes it easy to add/remove user licenses, easy to set up call routing, virtual attendants and is very scalable without the need for large capital investments."
Andy Dao
Crown Worldwide

"AVOXI support and sales agents always take time and patiently walk us through our questions and issues. Unlike some providers who often just brushed off "silly" questions and don't bother to address each question or query raised."
Wey Jing Ho
World Link Communications

"Easy to use, great customer support, and reasonable pricing that can be customized according to usage."
Patricia Neo
Hyatt Corp

"In comparison to other similar services existing on the market AVOXI definitely makes a difference on every level.”
Capucine Golicheff
BNP Paribas

”The interface is easy to use and very user friendly, our teams required very little training to get started right away.”
Marco Rinalducci
Argos Assistance

"AVOXI makes it easy to add/remove user licenses, easy to set up call routing, virtual attendants and is very scalable without the need for large capital investments."
Andy Dao
Crown Worldwide

"AVOXI support and sales agents always take time and patiently walk us through our questions and issues. Unlike some providers who often just brushed off "silly" questions and don't bother to address each question or query raised."
Wey Jing Ho
World Link Communications

Award-Winning UK SIP Service Provider

AVOXI’s all-in-one platform delivers everything you need to successfully run and manage your global cloud communications.

Contact Center Awards
Contact Center Awards

Award-Winning UK SIP Service Provider

With notable recognition for our 20 years of global voice and messaging experience to our emerging solutions that are gaining adoption, AVOXI’s all-in-one platform delivers everything you need to successfully run and manage your global cloud communications.

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UK SIP Trunk Service Features

Hosted voice service in the UK includes all the tools you need for better business communications right away.

Call Routing

Divert incoming calls to another number or device with intelligent call routing.

IVR / Auto Attendant

Route inbound callers to the correct recipient through automated prompts and use of the dialpad.

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Call Recording

Record calls to easily monitor call quality, customer interactions, and reference details about the conversation.

Voicemail Transcription

Voicemails for missed calls are sent directly to your email inbox and include a transcription of your messages.

Global SIP Trunking

Get amazing voice quality, secure call routing, and affordable SIP termination worldwide with SIP trunking from AVOXI.

MS Teams Direct Routing

Benefit from the most extensive and reliable voice service perfect fit into your Microsoft Teams environment.

Local Caller ID

Local VoIP termination in the UK means high-quality audio and outbound caller ID that works every time. 

Number Porting

Easily port your number to the AVOXI network for free, and even get paid to transfer your number.

UK VoIP SIP Service FAQ

Deploy SIP trunks and start managing calls in a matter of minutes when you buy a SIP DID number online! For SIP trunk solutions, we recommend speaking with one of our experts for complete solution details and pricing, and so we can account for custom requirements with your service. 

There are no additional costs to set up SIP trunking once you are in the AVOXI platform, you only pay for your numbers and the calls you make. Wholesale voice rates are available for enterprise and resellers with large call volumes. Speak with an expert for A-Z SIP trunk rates. 

Yes! For guaranteed outbound caller ID, choose any UK DID numbers labeled TrueLocal. TrueLocal numbers provide local origination and termination, ensuring caller ID works as intended every time. 

Outbound caller ID may work even when using numbers not labeled TrueLocal. However, we can only guarantee proper CNAM when using TrueLocal numbers.

Yes! AVOXI SIP trunking is a perfect alternative to UK Calling Plans in Teams. Our built-in, Microsoft-approved SBC solution makes configuration in Teams quick and easy. 

In addition to Microsoft Teams, AVOXI's VoIP service works with virtually any phone system setup. 

For more information, see how to configure SIP trunks. Options for system-specific configuration instructions are included at the bottom, including: 

  • 3CX SIP Trunk Configuration
  • FreePBX SIP Trunk Configuration
  • Twilio SIP Trunk Configuration
  • Asterisk SIP Trunk Configuration
  • Five9 SIP Trunk Configuration
  • Talkdesk SIP Trunk Configuration
  • Genesys SIP Trunk Configuration

Provision toll free, non-geographic, mobile, and local UK numbers with AVOXI. TrueLocal SIP origination and termination is available with any local number type in the UK. Don't see the area code you're looking for in our shopping cart? Let us know and we'll get it added for you!

Popular number types in the UK include:

  • London (20)
  • Birmingham (12)
  • Non-geographic (03)
  • Toll Free (0800 and 0808)

AVOXI provides UK SIP trunking with unlimited concurrent call capacity for no additional charge. Outbound calls are charged per-minute. Per-minute rates or bundled call packages are available for inbound calls. 

In addition to the best UK SIP trunking service available, popular solutions from AVOXI include cloud contact center software and phone number porting.

Expect the Best from Your UK SIP Trunk Provider

Look around the AVOXI platform and see what modernized SIP service can do.
Talk to an expert today and try it risk-free!