ISDN PRI Capabilities and the Asterisk Implementation ... - Asterisk-ES
ISDN PRI Capabilities and the Asterisk Implementation ... - Asterisk-ES
ISDN PRI Capabilities and the Asterisk Implementation ... - Asterisk-ES
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Primary Rate Interface – <strong>PRI</strong> – 23B+D / 30B+D<br />
Facility Associated Signaling (FAS)<br />
D-Channel<br />
B-Channel<br />
B-Channel<br />
<strong>ISDN</strong><br />
Protocol<br />
Q.931<br />
Q.921<br />
T1 / E1<br />
B-Channel<br />
B-Channel<br />
B-Channel<br />
• Looks like a “regular” T1<br />
• All signaling in <strong>the</strong> D-channel<br />
• B-channels are true “pipes”<br />
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