Callserve, is Europe's leading Internet Telephone provider and one of the fastest growing businesses in the UK.

Founded by Paul Duffy in 1999, Callserve is based in London (UK), where the company hosts the telecom infrastructure that allows hundreds of thousands of customers around the World, to make low cost telephone calls through the Internet.

Callserve also provides Internet Telephone services and expertise to major international businesses such as Microsoft, Sony and Freeserve.

For users without their own PC, Callserve's sister brand, Phoneserve, offers a pre-paid calling card alternative.