Integrated Services Digital Network (ISDN)

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AT&T’s ISDN Primary Rate Interface (PRI) service uses the public telephone network to carry an all-digital signal that can satisfy your company’s voice and data communications needs in the most efficient, flexible way possible.   With PRI service you can:

• Combine voice and data communications with the flexibility to add capacity when you need it.
• Re-allocate capacity at any time.
• Expect up to 1.544 Mbps of capacity – the equivalent of a T1 line.

Availability

AT&T offers ISDN Primary Rate Interface service within AT&T's regional service areas, and nationally in select cities.

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ISDN PRI is a high-speed digital connection for voice and data between your PBX and the AT&T public switched telephone network.  It consolidates 23 voice or data service channels on one 1.544 Mbps transport line into a PBX or computer network. It simplifies PBX access to many applications, including LAN-to-LAN connectivity and videoconferencing.  When used for trunking, you can improve PBX capacity and can transmit voice, WATS, toll-free and circuit-switched data calls. With dynamic call allocation you can use the same line for different voice or data applications as needed.

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• Any channel can carry any kind of connection, eliminating single-purpose trunks such as Direct Inward Dial (DID), Direct Outward Dial (DOD), and dedicated video or data lines.
• If data is your main communication need, the inward data option supports analog, digital data calls, and a digital data only option.
• Carry signaling information over a separate channel and speed up the origination, termination, or any other changes required to process your calls.
• Allocate more channels to an application in multiples of 64 Kbps.
• A specialized ISDN-based trunking solution, PrimeConnect PRI is available for applications and locations that receive very high volumes (200,000 to 400,000 minutes per month) of inbound-only traffic.

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• Nationwide coverage with a competitive pricing structure 
• The ability to support multiple call types makes the most efficient use of your available bandwidth
• Unsurpassed performance that comes with 100% digital connectivity
• Faster call set up time
• Support provided by AT&T's industry-leading 24 hour network monitoring and management center
• Automatic call-by-call channel allocation makes the best use of available capacity

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• Primary Rate Interface (PRI) - PrimePlex and PrimeConnect

Move calls and information faster and more efficiently with a single digital connection. AT&T offers PrimePlex and PrimeConnect services nationally in select cities.

• Primary Rate ISDN (PRI)

Move calls and information faster and more efficiently with a single digital connection. AT&T offers this service within our regional service areas.