SIP Trunking

With SIP Trunking you simplify all your telecommunications into a single IP network. You keep all the features of traditional telephony, and call quality, while gaining a monthly cost saving as high as 50%.

ISDN Services

With over 20 years’ experience, and the most comprehensive Pan-European network, Colt is the ISDN provider of choice for thousands of businesses across Europe.

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+44 (0) 20 7863 5510

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