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Ironton’s PRI circuits are delivered over our privately-owned fiber-optic network, ensuring the highest service availability and reliability. A TDM PRI is a telecommunications standard used in the delivery of multiple digital voice calls, providing 23 voice channels on a single connection to a customer’s phone system. Ironton has been providing PRI services for over 40 years to enterprise businesses, healthcare facilities, and local schools and universities.

By keeping voice and data on distinctly different channels, a TDM PRI provides the utmost in security and reliability, either for primary inbound and outbound calling or as a backup circuit for SIP Trunking. For more information, please e-mail or call 610-799-3131. For SIP-delivered PRI circuits and SIP Trunking, please visit or e-mail