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B2B-Exchange
  866-433-0614     Detail
Offers many types of calling besides traditional sales calls.

Marketing Support Network
  800.887.8874     Detail
Provides many services include inbound and outbound call centers, live chat & email support, small package & literature fulfillment, data processing & cleansing and more.

OPK Telemarketing Services
  303 791 9930      6834 S. University Blvd # 133 , Denver, Colorado 80122 Detail
Business professionals who are able to engage executive level decision makers in meaningful, open ended conversations.

StarTek, Inc.
  303.262.4500      8200 East Maplewood Ave., Suite 100 , Denver, Colorado 80111 Detail
A business process outsourcing (BPO) company dedicated to service.

Worldwide Call Centers
  888.308.9675      Detail
Provides clients with the best possible call center agencies and call center agencies with the best possible clients.