Quantum's ISDN PRI service is a digital telephone service that delivers crystal-clear voice conversations over a broadband circuit. A PRI can handle up to 23 simultaneous voice conversations and is expandable to hundreds of conversations. ISDN PRI also enables Direct Inward Dialing, which will allow the assignment of unique telephone numbers to individuals within your organization to efficiently route calls directly to their destination without having to first go through a receptionist or auto attendant. Quantum's PRI service also includes Calling Number w/ Name.

Key Features:

  • Unlimited Local Calling
  • Competitive Long Distance and International Rates
  • Superior Voice Quality
  • Efficient Call Routing
  • Direct Inward Dialing
  • Calling Number w/Name
  • Available anywhere in the Baltimore Metro areas


Please call us today at 410-239-6920 or 1-888-889-4NET, and let us help you select the ISDN PRI plan that best serves your needs.

Surcharges, taxes, and tax recovery fees may apply. Service may not be available in all areas, and service is subject to final confirmation by Quantum. All offers are subject to change without notice, and cannot be combined with other discounts or promotions. Other terms and conditions may apply.

Quantum provides service in Carroll County and the Baltimore metro area!



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Use of Quantum's services, systems, servers, and facilities, constitutes the customer's agreement with Quantum's Rules and Regulations, and the Quantum Service Agreement, both of which are subject to change without notice.


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