Index: chan_dahdi.conf.sample
===================================================================
--- chan_dahdi.conf.sample	(revision 216598)
+++ chan_dahdi.conf.sample	(working copy)
@@ -373,9 +373,19 @@
 ;     polarity_IN = polarity reversal signals the start, for India,
 ;                   for dtmf dialtone detection; using DTMF.
 ;                   (see doc/India-CID.txt)
+;			dtmf				= causes monitor loop to look for dtmf energy on the
+;										incoming channel to initate cid acquisition
 ;
 ;cidstart=polarity
 ;
+; When cidstart=dtmf, the energy level used to trigger dtmf cid acquisition. This number is
+; compared to the average over a packet of audio of the absolute values of 16
+; bit signed linear samples. The default is set to 256. The choice of 256 is
+; arbitrary. The value you should select should be high enough to prevent false
+; detections while low enough to insure that no dtmf spills are missed.
+;
+;dtmfcidlevel=256
+;
 ; Whether or not to hide outgoing caller ID (Override with *67 or *82)
 ; (If your dialplan doesn't catch it)
 ;