Improve documentation of ${SIPDOMAIN}

[asterisk/asterisk.git] / doc / README.variables

diff --git a/doc/README.variables b/doc/README.variables
index c8a66c7..95485ba 100755 (executable)
--- a/doc/README.variables
+++ b/doc/README.variables
@@ -36,8 +36,15 @@ ${EXTEN}     Current extension
 ${CONTEXT}      Current context
 ${PRIORITY}    Current priority
 ${CHANNEL}     Current channel name
+${ENV(VAR)}    Environmental variable VAR
+${LEN(VAR)}    String length of VAR (integer)
 ${EPOCH}       Current unix style epoch
 ${DATETIME}    Current date time in the format: YYYY-MM-DD_HH:MM:SS
+${UNIQUEID}    Current call unique identifier
+${DNID}         Dialed Number Identifier
+${RDNIS}        Redirected Dial Number ID Service
+${HANGUPCAUSE} Hangup cause on last PRI hangup
+${SIPDOMAIN}    SIP destination domain of an inbound call (if appropriate)
 
 There are two reference modes - reference by value and reference by name. 
 To refer to a variable with its name (as an argument to a function that