The Voice API trusted by developers in the UK.
Crystal clear calls
With Tier-1 interconnects at major global internet hubs, including in London, your calls get through the first time, every time. High-speed connections mean reduced latency and jitter as calls avoid the public internet.
Goodbye long awkward pauses
Using an edge-stack approach, we leverage multiple global points of presence to process data in the location nearest your application—for consistently low latency levels.
Calling without limits
Embed PSTN, SIP, or VoIP calling into any phone, browser, SIP domain or mobile application. Get instant local, national and toll-free numbers, and scale on demand with unlimited capacity.
Premium Answering Machine Detection
Speech to Text
We're a fully licensed carrier in the UK, with our own number ranges and full compliance with British telecoms regulations.
Competitors rely on aggregators for their phone numbers, so they can't troubleshoot issues efficiently when they inevitably arise.
Our private global IP network was purpose-built for real-time communications, so your calls are crystal clear and secure, with low latency.
The internet wasn’t built for real-time communications, and it shows—with high latency, packet loss, and poor security.
We use an edge-stack approach to route your data via the closest server to your application to deliver market-leading latency.
Greater reliance on the public internet and less control over core communications functionality significantly increases latency.
Deep number coverage
We're a fully licensed carrier in the UK with our own +44 number ranges, and we have partnerships in over 140 countries.
Our network connects a point of presence in London with nine more across the globe, for worry-free compliant global communications.
Real time control
The Telnyx API allows users to receive commands dynamically throughout the call for granular-level, interactive command and control.
When cloud providers go down, we stay up. Our redundant multi-cloud architecture and automatic call recovery stop your calls from dropping.
We cut out the middlemen and pass the cost savings on to you. Save an average of 30% when you switch from Twilio.
Support you can count on
Our world-leading 24/7 NOC support is free for every customer. Engineers in the UK & Ireland are available by phone, chat, and email.
Frequently Asked Questions
Absolutely! Our voice API works the same across the globe, so you can control calls to and from +44 numbers just the same as you would anywhere else.
A voice API is a tool that software developers use to make and receive phone calls using an Application Programming Interface (API). A voice API connects internet-based applications to the Public Switched Telephone Network (PSTN).
Absolutely. Text-to-speech allows you to convert text to speech and play it back on the call. We leverage Amazon Polly to provide a conversational experience, available across 29 languages and accents. You can find out how to use the speak_text command in our developer center.
While phone calls made using a voice API can be powered over the internet, they also rely on a VoIP network to be completed. WebRTC calls are solely focused on browser-based communication. Learn more about Telnyx’s WebRTC solution.