Overview

Award-winning voice and services

Our fully cloud-enabled voice portfolio powers managed Unified Communications and customer contact services, from freephone numbers to omnichannel cloud contact centres. With high availability SIP connectivity, we guarantee always-on service for cloud providers, OTT BYOC solutions and customer premises.

Explore your global voice options from a one stop shop for all your voice needs, with full regulatory compliance.

Trusted by the worlds leading companies

Customer Stories

SIP Trunking
Unified Communications
Voice services

“With Colt we have a reliable networking solution that meets our simplification and consolidation aims. It also allows us to centralise our billing & optimise our costs across Europe."

Thomas Laromiguière
IT Systems Architect, RRG

“Both the provision of the necessary services and their configuration by Colt were very fast."

Xavi Bel
Head of Infrastructure and Security

“We turned to Colt because it has good availability of proprietary fibre in all the main countries where lm group operates."

Giuseppe Arcoraci
Network Manager

Why colt?

We deliver the extraordinary every day for our customers, people and partners. Here’s what sets us apart.

75
+

Countires served

With voice capabilities across Europe, Asia and the Americas, and expert support on the ground, we make global connectivity feel local.

32,000
+

Buildings connected

With Colt fibre and millions more available via our Colt Network as a Service platform across Europe, Asia and the US.

25
YEARS +

EXPERIENCE AS A VOICE OPERATOR

Customer experience has always set us apart and our NPS score is one of the best in the industry.

The extraordinary everyday.

By tackling the complexities and frustrations of the everyday, we take away the grind - making room for the extraordinary.