6.2. ISDN Primary Rate Interface

The Global Call ISDN Primary Rate Interface (PRI) firmware supports both T-1 and E-1 protocols.

The T-1 protocol implementations comply with the North American standard ISDN PRI and the INS-1500 standard used in Japan. In North America and Japan, the ISDN Primary Rate includes 23 voice/data channels (B channels) and one signaling channel (D channel).

The E-1 protocol implementations comply with the E-1 ISDN PRI protocols. The E-1 ISDN Primary Rate includes 30 voice/data channels (B channels) and two additional channels: one signaling channel (D channel) and one framing channel to handle synchronization.

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