ISDN
ISDN - Integrated Services Digital Network
Telecommunications service that uses digital transmission and switching technology to provide voice and data communications on a bearer channel while sending signaling on a data channel.
BRI - Basic Rate ISDN
An ISDN service rate of 144 Kbps, provided as two B - channels of 64 Kbps for data transfer and one D - channel of 16 Kbps for control and signaling.
Up to 8 BRI lines can be extended on a T1 to provide access to the Long Distance Network
PRI - Primary Rate ISDN
A T1 based ISDN service with 23 64 Kbps channels and one 64 Kbps channel for control and signaling.
PRI provides the security, functionality, and speed of SS7 trunking and can be extended to your location for connection to the Long Distance Network