Primary Rate Interface


ISDN PRI (Primary Rate Interface) service brings your business proven network technology that works with your office phone system to bring you 23 circuits to handle your company’s communication needs. Enjoy the benefits of direct-inward-dialing (DID) so every employee can have their own calls routed to their extension – no need to route calls through an attendant.

  • Local Number Porting for your existing service
  • New Telephone Number assignment for new installations
  • Direct-In-Dial number blocks for consistent dialing plans
  • Nationwide coverage
  • Competitive rate structure

Talk with your CornerStone representative to find out if your business location qualifies for PRI service. If you’re not sure that a PRI is the right solution for you, ask about CornerStone’s SIP trunk service a solution that also provides DID capabilities.