Contact Us

Toll Free throughout the United States (888) 452 - 3550 Commercial Telephone Systems will be demonstrating the Avaya IP Office Communications System and the Avaya Partner ACS at the St. Louis Small Business Expo on Tuesday March 21st at the St. Charles Convention Center from 12 - 7pm. Admission is free and CTS will conduct several large giveaways throughout the day including a Dell 17" LCD Monitor.

St. Louis Metro area including Southern Illinois Commercial Telephone Systems
2133 Johnson Rd. Ste. 105
Granite City, IL 62040

Illinois: (618) 452-3550
Missouri: (314) 421-3550

Springfield, Decatur and Northern Illinois Commercial Telephone Systems
610 W. Monroe St.
Springfield, IL 62704

(217) 553-4393

Email Sales Contact: sales@ctsphone.com
Service Contact: service@ctsphone.com
Technical Support contact: techsupport@ctsphone.com