Colt has a wide portfolio of business phone lines & systems with a broad international coverage now extended to more than 20 countries in Europe, Asia, and North America.

Business Phone Lines & Systems

SIP/ISDN Services

Colt Voice portfolio delivers reliable and affordable carrier and enterprise business grade services to enterprises.

Cloud UC

Colt Cloud UC is a flexible and scalable, fully managed, cloud-based one stop shop solution that comprises of IP Telephony and Unified Communications, provided to customers as a service.

IN Services

Colt Intelligent Network (IN) Services is a managed portfolio of inbound voice services that provide our customer’s callers with an improved user experience, whilst maximising the performance of the customer’s call centre.

Service Provider Solutions

A portfolio of comprehensive Wholesale VoIP propositions addressing the needs of Carriers, Resellers and Service Providers.

Colt serves the enterprise, reseller and wholesale segments with a tailored service wrap and is ideally positioned to meet the growing global challenges of our customers. We deliver a flexible - with on-demand services - and resilient all-catering capabilities for our enterprise services, while at the same time we offer completely automated solutions for our carriers and resellers.

Colt voice services portfolio includes outbound voice services to connect to enterprises’ PBXs – either traditional ISDN services or Voice over IP SIP Trunking – as well as inbound voice services (e.g. 0800 Freephone) that include value added customer contact centre services. As enterprises are increasingly looking at moving their communication infrastructure to the cloud, Colt provides unified communications as a service solutions as an alternative to customer owned premise based PBX.

See how businesses are using our business phone lines & systems
Voice services case studies →

Colt's business phone lines & systems are available on a global network
Learn about the Colt IQ Network →

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