New Voice Capabilities
Easily add crisp HD quality VoIP calling to your applications, by connecting to our Voice APIs and using WiFi calling, PSTN origination and termination, or the new Voice verification services. Add voice calling for better app engagement, stickiness, and increased user retention. Our voice services are built on the same carrier-grade platform as our leading messaging services.
CLX offers competitive pricing for our Voice product. Find out more on our Pricing page.
App to Phone calling
Calling from your app to landline and mobile phone numbers with PSTN termination.
Phone to Phone (Anonymous) calling
Anonymous and international calling with local DIDs across markets.
App to App Calling
In-app voice calling over a data connection.
Carrier Grade Platform
Our voice services are built on a carrier-grade platform used by 70+ mobile network operators world wide.
Leading Voice Technology
HD Voice Codec
We improve upon the HD Opus Voice Codec with automatic and adaptive configuration to adjust latency and audio quality according to network speed to optimize sound. Using FEC (forward error correction), we send redundant data so that the receiver only recognizes the data portion that is error-free.
Our direct connections with aggregators maximize routing for the best quality connections at all times. Monitoring traffic 24/7, we engage in early detection of connection issues or reduced quality and re-routes traffic accordingly, ensuring the best in quality.
Call Setup Speed
With low latency call setup, the receiver to be notified under a second of an incoming call when using our active connection technology and in 1-3 seconds using push notifications. This is superior to standard protocol for VoIP, which results in call setup times of 2-5 seconds.
Manage DID rentals in the dashboard with auto-renewal for ease of maintenance and no service interruptions.
All voice streams are encrypted end-to-end.
Reach Global Markets
Reach markets in every country across the globe by enabling users to contact their friends and family via voice.
Significantly reduce call setup times by 50%.
Send Push Notifications directly from the SDK for seamless communication in the foreground and background.
The CLX Difference
World Class Cloud Communications Platform
Programmable Cloud APIs
Security & Compliance
Succeed at Scale
Optimized to Deliver
Tier 1 Super Network
Deep Carrier Integration
Direct Escalation if Things Go Wrong
Passionate about Service
Can be Trusted to Do the Right Thing
Obsessed with Automation & Efficiency