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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Architectural Overview – Kernel Side<br />
• Zaptel/DAHDI<br />
– Communicates with <strong>Asterisk</strong> via chan_zap/chan_dahdi<br />
– D<br />
oes<br />
n<br />
(signalling ot actually do any of <strong>the</strong> <strong>ISDN</strong> signaling (only RBS bit<br />
– Provides services for higher layers that actually do <strong>the</strong> signalling<br />
• Zaptel/DAHDI Hardware Drivers<br />
– Provide “clear channel timeslots” to which zaptel communicates<br />
– Interrupt driven Pseudo-TDM bus<br />
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