Global resilient SIP trunking built to scale

Enjoy a carrier-grade, built to scale SIP trunking infrastructure to ensure your agents never face a choppy line or dropped call again.

Enterprise class. Carrier grade. Global scale.

As a registered carrier, we benefit from direct fiber interconnection with top tier 1 carriers. This ensures unparalleled service quality and security for our clients, as do our international datacenters. You can reach over 220 countries with low latency and premium quality.

SIP trunk - A datacenter linked to four phones

Global calling from day one!

Deploy our SIP services easily and integrate them in the blink of an eye thanks to SIP trunking, SIP registrar and IAX (Inter-Asterisk-eXchange): choose the right solution to fit your bandwidth or call quality needs. We support a wide range of codecs to let you call all around the world.

Get deeper insights with API integration

For a more sophisticated call experience, connect to our API to go beyond call termination: create scenarios for incoming calls using Interactive Voice Response (IVR), acquire and attribute numbers automatically, and much more. Get deeper insights with data concerning hang-up sources, call duration, recordings and other key metrics.

SIP trunk - A terminal window opened with example of code on the background. An illustration with a server in a dialog bow forefront

SIP Trunking

Real-time Call Control

Dynamic DIDs

Call forwarding

Call Detailed Report (CDR)

Why CALLR

Carrier grade quality

As a carrier, we operate our own infrastructure and routes in Europe and an interconnection network with tier 1 carriers in the rest of the world. This ensures complete control over the quality of the traffic we provide for all our customers.

Reliable partner

In 6 years, we've built and maintained a reliable and innovative worldwide network. Thanks to our efficient infrastructure and routing system, we’re able to offer both competitive pricing and premium quality.

Global network

With points of presence around the world, reach more than 220 countries with unparalleled call quality. Break into new countries and smoothly scale up existing infrastructures with our powerful network.