Das Asterisk Buch

Ermittelt, ob ein bestimmter Channel momentan verfügbar ist.

ChanIsAvail(Technology1/Resource1[&Technology2/Resource2...][,Optionen])

Prüft, ob irgendeiner der angeforderten Kanäle verfügbar ist (in der angegebenen Reihenfolge). Liefert 0 zurück bei Erfolg oder -1, falls kein Kanal verfügbar ist.

Ist die Option s (für state) angegeben, wird Asterisk den Channel als nicht verfügbar betrachten, wenn er in Gebrauch ist – sogar dann, falls er einen weiteren anderen Anruf aufnehmen kann. Mit der Option j wird, falls der Channel nicht verfügbar ist, zur Priorität n+101 gesprungen.

Asterisk-Versionen: 

————————| 1.2 |————————| 1.4 |————————| 1.6 |————————

Interner Hilfetext zu dieser Applikation in Asterisk 1.4: 

  -= Info about application 'ChanIsAvail' =-

[Synopsis]
Check channel availability

[Description]
  ChanIsAvail(Technology/resource[&Technology2/resource2...][|options]):
This application will check to see if any of the specified channels are
available. The following variables will be set by this application:
  ${AVAILCHAN}     - the name of the available channel, if one exists
  ${AVAILORIGCHAN} - the canonical channel name that was used to create the channel
  ${AVAILSTATUS}   - the status code for the available channel
  Options:
    s - Consider the channel unavailable if the channel is in use at all
    j - Support jumping to priority n+101 if no channel is available

Differenz des internen Hilfetexts von Asterisk 1.2 zu 1.4: — keine —

Differenz des internen Hilfetexts von Asterisk 1.4 zu 1.6: 

--- in Asterisk 1.4
+++ in Asterisk 1.6
@@ -4,12 +4,15 @@
   Check channel availability

   [Description]
-    ChanIsAvail(Technology/resource[&Technology2/resource2...][|options]):
+    ChanIsAvail(Technology/resource[&Technology2/resource2...][,options]):
   This application will check to see if any of the specified channels are
-  available. The following variables will be set by this application:
-    ${AVAILCHAN}     - the name of the available channel, if one exists
-    ${AVAILORIGCHAN} - the canonical channel name that was used to create the channel
-    ${AVAILSTATUS}   - the status code for the available channel
+  available.
     Options:
-      s - Consider the channel unavailable if the channel is in use at all
-      j - Support jumping to priority n+101 if no channel is available
+      a - Check for all available channels, not only the first one.
+      s - Consider the channel unavailable if the channel is in use at all.
+      t - Simply checks if specified channels exist in the channel list
+          (implies option s).
+  This application sets the following channel variable upon completion:
+    AVAILCHAN     - the name of the available channel, if one exists
+    AVAILORIGCHAN - the canonical channel name that was used to create the channel
+    AVAILSTATUS   - the status code for the available channel