Wikipedia
InterCall
InterCall, a subsidiary of West Corporation, is the largest conference and collaborations service provider in the world, and a leading provider of global cloud-based unified communications services. The company claims a customer base of over 2.9 million unique conference leaders in more than 65,000 organizations and 83 of the Fortune 100.
InterCall is headquartered in Chicago, Illinois, and maintains a strong U.S. presence, including four call centers and 26 sales offices, is bolstered by operations in Canada, Mexico, Latin America, the Caribbean, the United Kingdom, Ireland, France, Germany, Australia, New Zealand, China, India, Hong Kong, Singapore and Japan.