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The following companies and associations have chosen or endorsed Call One as a preferred telecommunications vendor:
Illinois Automobile Dealers Association
Illinois Association of School Business Officials
South Suburban Mayors & Managers Association
DuPage Mayors & Managers Conference
Chicago District Golf Association
Lake County Municipal League
Will County Governmental League
VoiceArrest® Certified Integrator
Suburban Purchasing Cooperative
Northwest Municipal Conference
Illinois Association of Park Districts
AICPA SOC Compliant
Illinois Association of County Board Members
Illinois Collectors Association
Illinois Library Association
McHenry County Council of Government
Southwest Conference of Mayors
The Township Officials of Illinois
Illinois Primary Health Care Association