diff -Naur asterisk-82029.orig/configs/misdn.conf.sample asterisk-82029.patched-misdnconf/configs/misdn.conf.sample
--- asterisk-82029.orig/configs/misdn.conf.sample	2007-07-09 14:37:53.000000000 +0700
+++ asterisk-82029.patched-misdnconf/configs/misdn.conf.sample	2007-09-10 09:17:02.000000000 +0700
@@ -227,8 +227,6 @@
 ; default: no
 ;
 pmp_l1_check=no
-pp_l2_check=no
-
 
 
 ;
@@ -370,14 +368,6 @@
 ;
 ;echocancel=no
 
-; this disables echocancellation when the call is bridged between 
-; mISDN channels
-;
-; default value: no
-;
-echocancelwhenbridged=no
-
-
 ; Set this to no to disable echotraining. You can enter a number > 10
 ; the value is a multiple of 0.125 ms. 
 ;