Concert Technologies Partner Program Demarc Extension Nationwide was developed by Concert Technologies as the industry leading resource for Telecom Agents and Channel Partners. Our Partner Program is handled through Concert Technologies.Visit our Partner Program page for more information. More Information What is a Demarc Extension?Demarc Extension Nationwide AdvantagesTerminologyIndustry HistoryFAQ Connect With Us Find out how Concert Technologies can help you with your next demarc extension. Contact Us Today