A telecommunications standard that delivers high-capacity ISDN service to large organizations. Operating over T1, E1, or J1 trunk lines, it multiplexes dozens of 64 kbps bearer channels for voice or data alongside a dedicated signaling channel. This allows a company PBX to route direct inward dialing numbers to individual desks without needing a separate copper pair for each employee.
We're migrating their legacy primary rate interface over to a SIP trunk next weekend.
Also heard as
- PRI
Related terms
PRI
The primary rate interface is an enterprise telecommunications standard for carrying multiple voice and data channels.
ISDN
Integrated Services Digital Network is an older standard for transmitting digital voice and data over standard telephone lines.
PBX
A private telephone network used within a company or organization.
T-carrier
A North American standard for digitally multiplexing voice and data signals.