diff --git a/include/asterisk/channel.h b/include/asterisk/channel.h
index 3d58c83f60..821ed09b0c 100644
--- a/include/asterisk/channel.h
+++ b/include/asterisk/channel.h
@@ -1135,7 +1135,24 @@ int ast_indicate_data(struct ast_channel *chan, int condition, const void *data,
   \return Returns < 0 on  failure, 0 if nothing ever arrived, and the # of ms remaining otherwise */
 int ast_waitfor(struct ast_channel *chan, int ms);
 
-/*! \brief Wait for a specified amount of time, looking for hangups
+/*!
+ * \brief Should we keep this frame for later?
+ *
+ * There are functions such as ast_safe_sleep which will
+ * service a channel to ensure that it does not have a
+ * have a large backlog of queued frames. When this happens,
+ * we want to hold on to specific frame types and just drop
+ * others. This function will tell if the frame we just
+ * read should be held onto.
+ *
+ * \param frame The frame we just read
+ * \retval 1 frame should be kept
+ * \retval 0 frame should be dropped
+ */
+int ast_is_deferrable_frame(const struct ast_frame *frame);
+
+/*!
+ * \brief Wait for a specified amount of time, looking for hangups
  * \param chan channel to wait for
  * \param ms length of time in milliseconds to sleep
  * Waits for a specified amount of time, servicing the channel as required.
diff --git a/main/autoservice.c b/main/autoservice.c
index 4e1cd52033..0a963097d4 100644
--- a/main/autoservice.c
+++ b/main/autoservice.c
@@ -128,32 +128,8 @@ static void *autoservice_run(void *ign)
 			 * thread in charge of this channel will know. */
 
 			defer_frame = &hangup_frame;
-		} else {
-
-			/* Do not add a default entry in this switch statement.  Each new
-			 * frame type should be addressed directly as to whether it should
-			 * be queued up or not. */
-
-			switch (f->frametype) {
-			/* Save these frames */
-			case AST_FRAME_DTMF_END:
-			case AST_FRAME_CONTROL:
-			case AST_FRAME_TEXT:
-			case AST_FRAME_IMAGE:
-			case AST_FRAME_HTML:
-				defer_frame = f;
-				break;
-
-			/* Throw these frames away */
-			case AST_FRAME_DTMF_BEGIN:
-			case AST_FRAME_VOICE:
-			case AST_FRAME_VIDEO:
-			case AST_FRAME_NULL:
-			case AST_FRAME_IAX:
-			case AST_FRAME_CNG:
-			case AST_FRAME_MODEM:
-				break;
-			}
+		} else if (ast_is_deferrable_frame(f)) {
+			defer_frame = f;
 		}
 
 		if (defer_frame) {
diff --git a/main/channel.c b/main/channel.c
index d8a83034d0..426e6a7d94 100644
--- a/main/channel.c
+++ b/main/channel.c
@@ -1330,12 +1330,41 @@ struct ast_channel *ast_channel_search_locked(int (*is_match)(struct ast_channel
 	return c;
 }
 
+int ast_is_deferrable_frame(const struct ast_frame *frame)
+{
+	/* Do not add a default entry in this switch statement.  Each new
+	 * frame type should be addressed directly as to whether it should
+	 * be queued up or not.
+	 */
+	switch (frame->frametype) {
+	case AST_FRAME_DTMF_END:
+	case AST_FRAME_CONTROL:
+	case AST_FRAME_TEXT:
+	case AST_FRAME_IMAGE:
+	case AST_FRAME_HTML:
+		return 1;
+
+	case AST_FRAME_DTMF_BEGIN:
+	case AST_FRAME_VOICE:
+	case AST_FRAME_VIDEO:
+	case AST_FRAME_NULL:
+	case AST_FRAME_IAX:
+	case AST_FRAME_CNG:
+	case AST_FRAME_MODEM:
+		return 0;
+	}
+	return 0;
+}
+
 /*! \brief Wait, look for hangups and condition arg */
 int ast_safe_sleep_conditional(struct ast_channel *chan, int ms, int (*cond)(void*), void *data)
 {
 	struct ast_frame *f;
 	struct ast_silence_generator *silgen = NULL;
 	int res = 0;
+	AST_LIST_HEAD_NOLOCK(, ast_frame) deferred_frames;
+
+	AST_LIST_HEAD_INIT_NOLOCK(&deferred_frames);
 
 	/* If no other generator is present, start silencegen while waiting */
 	if (ast_opt_transmit_silence && !chan->generatordata) {
@@ -1343,6 +1372,7 @@ int ast_safe_sleep_conditional(struct ast_channel *chan, int ms, int (*cond)(voi
 	}
 
 	while (ms > 0) {
+		struct ast_frame *dup_f = NULL;
 		if (cond && ((*cond)(data) == 0)) {
 			break;
 		}
@@ -1357,7 +1387,18 @@ int ast_safe_sleep_conditional(struct ast_channel *chan, int ms, int (*cond)(voi
 				res = -1;
 				break;
 			}
-			ast_frfree(f);
+
+			if (!ast_is_deferrable_frame(f)) {
+				ast_frfree(f);
+				continue;
+			}
+			
+			if ((dup_f = ast_frisolate(f))) {
+				if (dup_f != f) {
+					ast_frfree(f);
+				}
+				AST_LIST_INSERT_HEAD(&deferred_frames, dup_f, frame_list);
+			}
 		}
 	}
 
@@ -1366,6 +1407,19 @@ int ast_safe_sleep_conditional(struct ast_channel *chan, int ms, int (*cond)(voi
 		ast_channel_stop_silence_generator(chan, silgen);
 	}
 
+	/* We need to free all the deferred frames, but we only need to
+	 * queue the deferred frames if there was no error and no
+	 * hangup was received
+	 */
+	ast_channel_lock(chan);
+	while ((f = AST_LIST_REMOVE_HEAD(&deferred_frames, frame_list))) {
+		if (!res) {
+			ast_queue_frame_head(chan, f);
+		}
+		ast_frfree(f);
+	}
+	ast_channel_unlock(chan);
+
 	return res;
 }