Commercial Telephone Systems is an Avaya Business Partner which means we are authorized to sell you quality phone equipment, provide phone system maintenance, and warranties with your purchase. Our Avaya Certified technicians and highly supportive staff is here to support you for any technical difficulties you may encounter.
CTS has been delivering excellent business phone system maintenance and installations in St Louis area and Illinois since 1974. We have been effectively providing onsite and remote work, adds and changes from administration.
Commercial Telephone Systems specializes in Business Telephone Systems, sales, installation, phone maintenance, and service. CTS also installs VOIP systems, voice data cabling. CTS is Serving Missouri, Illinois


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