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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chan_zap/libpri<br />
Libpri<br />
• Sits on top of a zaptel<br />
“dchan”<br />
• H<strong>and</strong>les all Q.921 (layer 2)<br />
<strong>and</strong> Q.931 (layer 3)<br />
messaging necessary for D<br />
-channel operation<br />
• Provides simple interface to<br />
chan_zap for making calls<br />
over D-channel<br />
• Q.931 Messages translate<br />
into easy to use <strong>PRI</strong> events<br />
© 2008 AT&T Knowledge Ventures. All rights reserved. AT&T<br />
<strong>and</strong> <strong>the</strong> AT&T logo are trademarks of AT&T Knowledge Ventures. Page 26<br />
Chan_zap<br />
• Utilizes libpri to maintain<br />
s<br />
i<br />
g<br />
naling services on D-channel<br />
• Directly interfaces with bearers through<br />
zaptel (includes<br />
r<br />
e<br />
a<br />
(data ding <strong>and</strong> writing audio<br />
• Provides glue interface between<br />
libpr<br />
i
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