diff --git a/funcs/func_channel.c b/funcs/func_channel.c
index 312806d966..c6e5ec1a34 100644
--- a/funcs/func_channel.c
+++ b/funcs/func_channel.c
@@ -278,6 +278,41 @@
same => n,Log(NOTICE, This channel is: ${CHANNEL(state)})
+ The following channel variables are available as special built-in
+ dialplan channel variables. These variables cannot be set or modified
+ and are read-only.
+
+
+ Caller ID presentation for incoming calls (PRI channels)
+
+
+ Caller ANI2 (PRI channels)
+
+
+ Caller Type of Number (PRI channels)
+
+
+ Transit Network Selector (PRI channels)
+
+
+ Current extension
+
+
+ Current context
+
+
+ Current priority
+
+
+ Current channel name
+
+
+ Current call unique identifier
+
+
+ Asterisk cause of hangup (inbound/outbound)
+
+
***/
diff --git a/funcs/func_env.c b/funcs/func_env.c
index e5e3e70e6a..f5ff3e0d3c 100644
--- a/funcs/func_env.c
+++ b/funcs/func_env.c
@@ -49,6 +49,55 @@
Variables starting with AST_ are reserved to the system and may not be set.
+ Additionally, the following system variables are available as special built-in dialplan variables.
+ These variables cannot be set or modified and are read-only.
+
+
+ Current unix style epoch
+
+
+ value of the systemname option from asterisk.conf
+
+
+ value of the astcachedir option from asterisk.conf
+
+
+ value of the astetcdir option from asterisk.conf
+
+
+ value of the astmoddir option from asterisk.conf
+
+
+ value of the astvarlib option from asterisk.conf
+
+
+ value of the astdbdir option from asterisk.conf
+
+
+ value of the astkeydir option from asterisk.conf
+
+
+ value of the astdatadir option from asterisk.conf
+
+
+ value of the astagidir option from asterisk.conf
+
+
+ value of the astspooldir option from asterisk.conf
+
+
+ value of the astrundir option from asterisk.conf
+
+
+ value of the astlogdir option from asterisk.conf
+
+
+ value of the astsbindir option from asterisk.conf
+
+
+ Global Entity ID set automatically, or from asterisk.conf
+
+