Add readme for variable (bug #2409)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@3762 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/doc/README.variables b/doc/README.variables
index cc5932fc148718edb9468eed03b4812508e81cf1..dfb6de3d10ea83f450d1a38fcf5c6a6698f3689f 100755 (executable)
--- a/doc/README.variables
+++ b/doc/README.variables
@@ -52,6 +52,7 @@ ${ACCOUNTCODE}        Account code (if specified)
 ${CALLERID}    Caller ID
 ${CALLERIDNAME}        Caller ID Name only
 ${CALLERIDNUM} Caller ID Number only
+${CALLINGPRES} PRI Caller ID presentation for incoming calls
 ${CHANNEL}     Current channel name
 ${CONTEXT}      Current context
 ${DATETIME}    Current date time in the format: YYYY-MM-DD_HH:MM:SS