PRI Trunks

Our PRI Trunks offers advanced features to ensure that your business is scalable and efficient.


With 6 to 23 channels per trunk


Optimizes IP PBX investment


Great calling features

Dedicated access for your PBX's

Internet Service USA PRI Trunks provides a physical connection from your PBX to the largest VoIP network in the nation — the Internet Service USA network. It allows you to manage costs by leveraging your existing PBX system, maintain business continuity when disaster strikes, and maximizes your phone capabilities over our private IP network. If you are looking to grow your business, the reliability and scalability of Internet Service USA PRI Trunks make it the right solution.

PRI Trunks features:

Destination Unreachable

Automatically reroute incoming calls to an alternate trunk group in case of a natural disaster or power outage.

Direct Inward Dial (DID)

Assign your employees a direct dial number for their convenience.

Direct Outward Dial (DOD)

Users on the PBX can place calls to outside lines without a switchboard attendant.

Call Detail Records (CDR)

Download detailed call records.

Business voice continuity

Phone calls can be routed between networks on a call-by-call basis providing seamless service during network connection issues.


Voice services are prioritized over all other traffic and all network equipment is secured by 2 layers of authentication.

International calling

Dial and speak; no long PINs to enter, just enter the phone number. Get billed only for what you use every month.

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