It’s not a phone line. It’s a business lifeline. Your business phone system is a critical link to sales, service and success. As an authorized ESI and Cisco Business Partner, Corporate Business System has expert-level knowledge to advise you when you are purchasing, upgrading or just trying to get the most from your business telephone system.

We provide consulting and service for ESI and Cisco telecommunications equipment. We also provide telephone system maintenance contracts with onsite response time guarantees. CBS Stocks critical maintenance spares in our Springfield office. CBS can provide telephone resources to meet your needs, whether you have a small medical office or a massive call center.

Our business telephone solutions includes:
Advanced Customer Service   |   Employee Mobility – Reach work from anywhere, make your Email, Voicemail and Mobile Phone all work together   |   Hosted Solution   |   Computer Telephony Integration   |   Maintenance and Post-Warranty Support

Please call 1.800.370.9984 to speak to a consultant today!

ESI Certified Reseller

Website: ESI Products


Estech Systems, Inc. (ESI) is a premier provider of on-premises  and cloud-based unified communications solutions for small to medium-sized businesses (SMBs).


Website: Cisco


The Cisco® Unified Communications system of voice, video and IP Communications products and applications helps organizations communicate more efficiently so that workers can streamline business processes, reach the right resource the first time, and increase profitability.