 Hello, how may I help you? This may be what modern work sounds like, but it's not happening on site at the office. Work today happens wherever you are. Modern Telephone Systems has been serving businesses in Tennessee and surrounding areas since the 1980s. Telecommunication has changed a lot over the years, and with the incorporation of stress-free, intuitive, and integrated interface, Modern Telephone Systems has been able to adapt and stay modern. Connect to your contacts, share files.