Index: include/asterisk/frame.h
===================================================================
--- include/asterisk/frame.h	(revision 102967)
+++ include/asterisk/frame.h	(working copy)
@@ -130,6 +130,13 @@
 	 *  The translator can not be free'd if the frame inside of it still has
 	 *  this flag set. */
 	AST_FRFLAG_FROM_TRANSLATOR = (1 << 1),
+	/*! Frame was already read from ast_read. Autoservice sets this flag
+	 *  on all frames it queues back to the channel to make sure ast_read
+	 *  won't do any special processing (like DTMF emulation) based on this
+	 *  frame. This is because the frame itself can be already a rusult
+	 *  of such a processing
+	 */
+	AST_FRFLAG_READ	= (1 << 2),
 };
 
 /*! \brief Data structure associated with a single frame of data
Index: main/autoservice.c
===================================================================
--- main/autoservice.c	(revision 102967)
+++ main/autoservice.c	(working copy)
@@ -252,6 +252,9 @@
 		usleep(1000);
 
 	while ((f = AST_LIST_REMOVE_HEAD(&dtmf_frames, frame_list))) {
+		/* Mark frame as already read so ast_read will not do any
+		   additional processing (like DTMF emulation) with it */
+		f->flags |= AST_FRFLAG_READ;
 		ast_queue_frame(chan, f);
 		ast_frfree(f);
 	}
Index: main/channel.c
===================================================================
--- main/channel.c	(revision 102967)
+++ main/channel.c	(working copy)
@@ -2020,6 +2020,17 @@
 			ast_frfree(f);
 			f = NULL;
 		}
+
+		if (f && (f->flags & AST_FRFLAG_READ)) {
+			/* This frame was already read from us by autoservice/dsp so we do not need
+			   do any processing on it because it may be actually a result of
+			   such a processing (emulated DTMF_BEGIN for example).
+			   However, reset AST_FRFLAG_READ to make sure the frame may be queued to another
+			   channel and read from there with all necessary processing  */
+			f->flags &= ~AST_FRFLAG_READ;
+			goto done;
+		}
+
 	} else {
 		chan->blocker = pthread_self();
 		if (ast_test_flag(chan, AST_FLAG_EXCEPTION)) {