Colt IN over Carrier VoIP specifically addresses the needs of Service Providers looking for dial-in numbers for their call centres and conferencing services in Europe.

Simplify your business

Manage all your inbound traffic to your Intelligent Network (IN) services across Europe with one single SIP interconnect.

We collect your IN calls and deliver them to your VoIP platform over our award-winning carrier-grade network in a scalable and cost-efficient way – fully compliant, supporting all country specific regulation.

Flexibility that meets your needs

Our comprehensive IN Services portfolio offers you Freephone, Shared Cost, Premium Rate and geographic numbers in 13 European countries.

Choose the SIP interconnect option which fits your business requirements (Ethernet, IP VPN with a guaranteed quality of service or public internet to connect your businesses worldwide).

Bill your end-customers in a flexible way with our twice daily standardised unrated CDRs.

Keep it simple and regulatory compliant

Stay focused on your business. Avoid complexity of contracting with multiple national operators and investing in local processes – with a unique, pan-European customer experience.

With more than 20 years’ regulatory experience, and our award-winning network, we are the European partner of choice for IN service numbers.


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Contact us about IN over Carrier VoIP:

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Case Study

CoStar Group –

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Meet Roberta, Internal Communications Specialist

“As a fairly new employee, I must say that Colt is like a roller coaster. It is fast paced and thrilling, sometimes it makes you want to scream with excitement or hold your breath before the next turn, but one thing is certain – at the end of the day, you can’t wait for the next ride! One aspect which has made my experience with Colt really positive is the smart and motivated people working here.”

Careers at Colt
Colt is a convenient one-stop shop for network and numbers in the 13 countries from which the majority of our European conferencing traffic comes. Amanda Thomas
VP Telecoms EMEA, InterCall