" We were looking for a single point of contact for our telecom service needs to handle our national footprint and supplement our corporate telecom department. Tandem Data is very responsive in getting our requests handled in a timely manner. I cannot imagine using another group after this experience."

M. Howsen, Director IT, Cross Point Funding


Avaya IP Office Special - phones Addison

Avaya Special - phones Addison

Avaya Certified Business Partner - phones Addison

Nortel Authorized Reseller - phones Addison

NEC Authorized Dealer - phones Addison

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Tandem Data Resource Group Addison Phone Systems

Connecting Companies for Tomorrow.

Nationwide Sales, Service & Support


Phone Systems Addison, Voice & Data Cabling Addison, IT Support and Computer Services Addison

Business phone systems, voice & data cabling, wireless networking design, installation and support. These products and services have made us a leading industry provider of communications systems in Addison. Our reach doesn't stop there though; we have the resources and experience to support clients with multiple locations across the United States. Project management and implementation is our specialty, and our national account team can provide a single point of contact for all your telecommunications needs, along with second-to-none customer service and support.

Business Telephone Systems
Tandem Data is a leading provider of business phone systems in Addison, for companies ranging from small to large. We sell, install, service, and maintain telephone systems from Avaya, Nortel and NEC in Addison and Nationwide:

New Systems

Avaya Phone Systems Addison
NEC Phone Systems Addison

Legacy Systems
Voice / Data / Fiber Optic Cabling Addison
Addison, Tandem Data Resource Group, Inc. offers network design and installation for local area networks and wide area networks. Whether a single office or a multi-location company, we can help with:
  • Category 3, 5, 6 Cabling
  • Coaxial Cabling
  • Fiber Optic Cabling
  • Wireless Connectivity
Wireless Networking Solutions
Addison, Tandem Data provides expert wireless network planning, installation and support. By understanding the unique needs of a business, we can offer turnkey solutions including:
  • Indoor Wi-Fi and Wireless
  • Outdoor Wi-Fi and Wireless
  • Wireless Bridges
  • Wireless Backhaul
  • Wireless Voice Over IP (VoIP)
  • Indoor cellular and Distributed Antenna Systems