InterCall

InterCall, a subsidiary of Intrado, is an Chicago based audio and web conferencing services provider.
History.
InterCall was founded in 1991 as a subsidiary of ITC Holding Company, and offered telephony, messaging, conferencing and collaboration tools for businesses.
In 2013, the company executed 25B minutes in conference calls globally and contributed to over $2.6B in revenue (West Corporation)/$1.069 (UC segment).
InterCall was acquired by West Corporation in 2003, beginning a period of rapid growth and acquisition. From 2003 to 2009, InterCall purchased ConferenceCall.com, Raindance, ECI Conference Call Services, Sprint Conferencing, Stream57, Genesys Conferencing, Corvent, POSTcti, SKT BCS, Unisfair and Smoothstone.