diff --git a/libs/openzap/mod_openzap/mod_openzap.c b/libs/openzap/mod_openzap/mod_openzap.c
index 1797cfe555..dcbf8b3294 100644
--- a/libs/openzap/mod_openzap/mod_openzap.c
+++ b/libs/openzap/mod_openzap/mod_openzap.c
@@ -578,7 +578,14 @@ static switch_status_t channel_read_frame(switch_core_session_t *session, switch
 
 	if (zap_channel_dequeue_dtmf(tech_pvt->zchan, dtmf, sizeof(dtmf))) {
 		switch_dtmf_t _dtmf = { 0, SWITCH_DEFAULT_DTMF_DURATION };
-		switch_channel_queue_dtmf(channel, &_dtmf);
+		char *p;
+		for (p = dtmf; p && *p; p++) {
+			if (is_dtmf(*p)) {
+				_dtmf.digit = *p;
+				zap_log(ZAP_LOG_DEBUG, "queue DTMF [%c]\n", *p);
+				switch_channel_queue_dtmf(channel, &_dtmf);
+			}
+		}
 	}
 
 	return SWITCH_STATUS_SUCCESS;
@@ -1214,7 +1221,7 @@ static ZIO_SIGNAL_CB_FUNCTION(on_isdn_signal)
 		}
 		break;
     case ZAP_SIGEVENT_STOP:
-		{
+		{	
 			while((session = zap_channel_get_session(sigmsg->channel, 0))) {
 				channel = switch_core_session_get_channel(session);
 				switch_channel_hangup(channel, sigmsg->channel->caller_data.hangup_cause);
diff --git a/libs/openzap/src/include/openzap.h b/libs/openzap/src/include/openzap.h
index 866c665251..d03ded222e 100644
--- a/libs/openzap/src/include/openzap.h
+++ b/libs/openzap/src/include/openzap.h
@@ -521,6 +521,7 @@ int zap_hash_equalkeys(void *k1, void *k2);
 uint32_t zap_hash_hashfromstring(void *ky);
 uint32_t zap_running(void);
 
+
 ZIO_CODEC_FUNCTION(zio_slin2ulaw);
 ZIO_CODEC_FUNCTION(zio_ulaw2slin);
 ZIO_CODEC_FUNCTION(zio_slin2alaw);
diff --git a/libs/openzap/src/zap_analog.c b/libs/openzap/src/zap_analog.c
index c560eade9c..a53d5ab7e6 100644
--- a/libs/openzap/src/zap_analog.c
+++ b/libs/openzap/src/zap_analog.c
@@ -38,7 +38,6 @@
 struct tm * localtime_r(const time_t *clock, struct tm *result);
 #endif
 
-
 static void *zap_analog_channel_run(zap_thread_t *me, void *obj);
 
 static ZIO_CHANNEL_OUTGOING_CALL_FUNCTION(analog_fxo_outgoing_call)
@@ -485,9 +484,10 @@ static void *zap_analog_channel_run(zap_thread_t *me, void *obj)
 			}
 		}
 
-		if ((dlen = zap_channel_dequeue_dtmf(zchan, dtmf + dtmf_offset, sizeof(dtmf) - strlen(dtmf)))) {
-			if (zchan->state == ZAP_CHANNEL_STATE_DIALTONE || zchan->state == ZAP_CHANNEL_STATE_COLLECT) {
-				zap_log(ZAP_LOG_DEBUG, "DTMF %s\n", dtmf + dtmf_offset);
+
+		if (zchan->state == ZAP_CHANNEL_STATE_DIALTONE || zchan->state == ZAP_CHANNEL_STATE_COLLECT) {
+			if ((dlen = zap_channel_dequeue_dtmf(zchan, dtmf + dtmf_offset, sizeof(dtmf) - strlen(dtmf)))) {
+
 				if (zchan->state == ZAP_CHANNEL_STATE_DIALTONE) {
 					zap_set_state_locked(zchan, ZAP_CHANNEL_STATE_COLLECT);
 					collecting = 1;
@@ -786,7 +786,6 @@ static void *zap_analog_run(zap_thread_t *me, void *obj)
 }
 
 
-
 zap_status_t zap_analog_start(zap_span_t *span)
 {
 	zap_analog_data_t *analog_data = span->signal_data;
diff --git a/libs/openzap/src/zap_io.c b/libs/openzap/src/zap_io.c
index 8703db8994..4f18f971d7 100644
--- a/libs/openzap/src/zap_io.c
+++ b/libs/openzap/src/zap_io.c
@@ -1412,7 +1412,11 @@ zap_size_t zap_channel_dequeue_dtmf(zap_channel_t *zchan, char *dtmf, zap_size_t
 
 	assert(zchan != NULL);
 
-	if (zap_buffer_inuse(zchan->digit_buffer)) {
+	if (!zap_test_flag(zchan, ZAP_CHANNEL_READY)) {
+		return ZAP_FAIL;
+	}
+
+	if (zchan->digit_buffer && zap_buffer_inuse(zchan->digit_buffer)) {
 		zap_mutex_lock(zchan->mutex);
 		if ((bytes = zap_buffer_read(zchan->digit_buffer, dtmf, len)) > 0) {
 			*(dtmf + bytes) = '\0';
@@ -1608,7 +1612,6 @@ zap_status_t zap_channel_read(zap_channel_t *zchan, void *data, zap_size_t *data
 		}
 
 		if (zap_test_flag(zchan, ZAP_CHANNEL_DTMF_DETECT)) {
-
 			teletone_dtmf_detect(&zchan->dtmf_detect, sln, (int)slen);
 			teletone_dtmf_get(&zchan->dtmf_detect, digit_str, sizeof(digit_str));
 
@@ -1987,7 +1990,7 @@ zap_status_t zap_global_destroy(void)
 	
 	zap_span_close_all();
 	globals.running = 0;
-	zap_sleep(200);
+	zap_sleep(1000);
 
 	for(i = 1; i <= globals.span_index; i++) {
 		zap_span_t *cur_span = &globals.spans[i];