Connect Cloud Voice with Colt

Connect your voice with Colt with our fully cloud enabled solutions.  Delivering managed Unified Communications and front office customer contact services from freephone numbers to omnichannel cloud contact centres.

Your connection options explained

Colt´s High Availability SIP connectivity ensure always on service both with cloud service providers/OTT BYOC (Bring Your Own Carrier) solutions and to the customer premises.


Microsoft Teams


Are you looking to move your voice into the cloud and want to replace your PBX by the Microsoft Phone System?  If so Colt can help, as a Microsoft Gold Partner we can do this via Direct Routing or if you are looking for a simpler solution we are also part of the Operator Connect Programme.

Use either Direct Routing or Operator or both to:

Achieve higher reliability and voice cost savings

Create a seamless user experience across all devices and geographies.

Utilise a single supplier for the end-to-end Microsoft 365 solution


IP Access with Cloud prioritisation

BYOC is offering choice to customers about who maintains the delivery of SIP (outbound calling and number management) and IN (Inbound calling numbers and routing) services. Colt can connect to Microsoft, Google, Zoom Genesys, Twilio, Cisco and in fact anywhere on our global footprint where you need to activate voice for your users.

Colt BYOC works best when:

You want to move your phone system to Microsoft, Cisco or Zoom or your contact centre to the cloud platforms of Genesys or Twilio and want to keep your voice contracts in place

You want your voice services delivered by experts such as Colt

You want fully integrated voice services across your UCaaS and CCaaS applications

Inbound & Freephone

Business Phone Numbers

Inbound and Freephone Numbers give you a non-geographic number, routing your customers to the right place, every time. Memorable, non-geo numbers allow you to re-route calls to the right department, and divert calls automatically should a line be engaged.

Our Inbound Number solutions include:

Toll-free numbers: let your customers call you from any location with no additional charge

Geographic: provide local services by demonstrating your local presence, without taking full cost

Create a professional value-added service to earn revenue from your callers

Cloud SIP

Cloud SBC

Colts Cloud SIP removes the need for physical SIP Trunks, allowing organisations to activate numbers without any on-site intervention across our pan-European footprint

Our Cloud SIP solutions include:

Cloud SBC allows you to leverage the benefits that Microsoft Teams can offer your organisation, all through a 100% cloud solution

SIP Trunking solutions you simplify all your telecommunications into a single IP network

ISDN SIP Trunk Voice line (v)

Still not sure?

Use our solution builder and request a callback from a solutions engineer.


Automate the everyday with Cloud Voice

In your future workplace, people will expect instant connections, a choice of how to communicate, and they will expect to spend less time on the mundane.

It’s time to automate the boring tasks and time-consuming parts of your business, to free up your workforce to spend time where they can add value.

Download our latest guide to discover how cloud voice can create a more productive, unified, and profitable workplace to carry you through the next decade.

Join over 25k+ customers


Why choose Colt?

Governance Icon

A Global Presence

We are trusted by over 25,000 customers globally - including some of the world's largest businesses, 18 of the top 25 banks and over 650 capital markets firms around the world. All that and still record NPS scores.

IQ Network Page-Icons-03

Technology leaders

Our technology sets us apart. We were one of the first to roll-out on-demand provisioning, and continue to lead with API, SDN + Edge compute compatibility for our customers.

IQ Network Page-Icons-01

Spoilt for choice

Over 31,000 buildings have direct fibre connectivity to our network. We connect more data centres in Europe, USA and Asia than any other provider, so you won't have to compromise on security & convenience.

Still not sure?

We'll help you build a solution tailor-made for your specific cloud environment and networking needs.

With more connected data centres across Europe, USA & Asia than any other provider backed up with the carrier-grade Colt IQ Network, whatever you choose, you're in safe hands.