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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 are here to support you for any technical difficulties you may encounter. At your convenience, we also maintain and install the following phone systems; ESI, Partner, Merlin Legend, Nortel, Norstar and more.


CTS has been delivering excellent business phone system maintenance and installations in the St Louis area and Illinois since 1974. We have been effectively providing great customer satisfaction by either working remotely or on location. Whether your service needs wiring, installation relocation, programming or training, CTS’s highly-qualified technicians will ensure that the job is completed to your satisfaction.


button2Have a question about your current system or interested in a new business phone system? Have a phone system already and need phone system maintenance? Please don’t hesitate to contact us. Even if you have a simple question, Commercial Telephone System’s highly trained staff is here to answer any questions you may have.


For over 40 years, Commercial Telephone Systems has been providing communications solutions and phone system maintenance services to businesses in St Louis Missouri, Illinois and throughout the United States. During that time CTS has satisfied thousands of customers by meeting their specific needs one customer at a time. Service is the motivating factor in our business. CTS will respond to major problems within two hours and minor issues usually that same day. Our technicians are exceptionally well qualified and friendly. We take pride in giving you the prompt attention you deserve and should expect from your communications source.


We pledge that our sales staff will listen carefully to your needs and propose a solution customized to your business. As an independent dealer of data and telecommunications equipment, CTS is able to provide the best solutions and phone system maintenance for your business requirements. Your communications solution will adapt to new technology and keep your business ahead of the curve. CTS can typically implement small solutions within days of your approval and larger solutions often within several


Since 1974, we have been serving the greater St. Louis Area and Illinois in phone system maintenance services. Our focus has been clear. That kind of constant presence is rare in the communications world. When you establish your relationship with CTS you can have peace of mind that the next time you need phone service or maintenance, you will find us to be just as available and accommodating as the first time. Our services and tech support are second to none.

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