West Corporation keeps those phone lines buzzing. The company is one of the leading teleservices providers in the US with more than 30 call centers and seven automated voice and data centers around the country and abroad. It offers both inbound and outbound call handling (including 911 support through its Intrado subsidiary) for such services as customer support, technical assistance, as well as sales and marketing and order processing. It also provides automated and Web-based customer care programs for its customers. West additionally offers conference call services through its Intercall operations, and it is one of the leading debt collections agencies in the US. The company filed for an IPO in October 2009.