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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@48149 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Olle Johansson
2006-11-30 18:22:10 +00:00
parent 7b11c89373
commit 7e4d482071
5 changed files with 39 additions and 2 deletions
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20
main/devicestate.c
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@@ -22,6 +22,8 @@
*
*
* \author Mark Spencer <markster@digium.com>
*
* \arg \ref AstExtState
*/
/*! \page AstExtState Extension and device states in Asterisk
*
@@ -59,10 +61,26 @@
* - SIP subscriptions, a.k.a. "blinking lamps" or
* "buddy lists"
*
* None of these handle user states, like an IM presense
* The CLI command "show hints" show last known state
*
* \note None of these handle user states, like an IM presense
* system. res_jabber.c can subscribe and watch such states
* in jabber/xmpp based systems.
*
* \section AstExtStateARch Architecture
*
* When a channel driver or asterisk app changes state for
* a watched object, it alerts the core. The core queues
* a change. When the change is processed, there's a query
* sent to the channel driver/provider if there's a function
* to handle that, otherwise a channel walk is issued to find
* a channel that involves the object.
*
* The changes are queued and processed by a separate thread.
* This thread calls the watchers subscribing to status
* changes for the object. For manager, this results
* in events. For SIP, NOTIFY requests.
*
*
*/