diff --git a/src/mod/endpoints/mod_gsmopen/gsmopen.h b/src/mod/endpoints/mod_gsmopen/gsmopen.h
index dd6cbea999..b37fa77834 100644
--- a/src/mod/endpoints/mod_gsmopen/gsmopen.h
+++ b/src/mod/endpoints/mod_gsmopen/gsmopen.h
@@ -455,6 +455,7 @@ struct private_object {
 
 	char buffer2[320];
 	int buffer2_full;
+	int serialPort_serial_audio_opened;
 
 };
 
diff --git a/src/mod/endpoints/mod_gsmopen/gsmopen_protocol.cpp b/src/mod/endpoints/mod_gsmopen/gsmopen_protocol.cpp
index 6e9e70876b..6af6a0075e 100644
--- a/src/mod/endpoints/mod_gsmopen/gsmopen_protocol.cpp
+++ b/src/mod/endpoints/mod_gsmopen/gsmopen_protocol.cpp
@@ -2202,7 +2202,7 @@ int gsmopen_serial_answer_AT(private_t *tech_pvt)
 			return -1;
 		}
 	}
-	res = gsmopen_serial_write_AT_expect(tech_pvt, "AT^DDSETEX=2", tech_pvt->at_dial_expect);
+	//res = gsmopen_serial_write_AT_expect(tech_pvt, "AT^DDSETEX=2", tech_pvt->at_dial_expect);
 	DEBUGA_GSMOPEN("AT: call answered\n", GSMOPEN_P_LOG);
 	return 0;
 }
@@ -2286,7 +2286,7 @@ int gsmopen_serial_call_AT(private_t *tech_pvt, char *dstr)
 		ERRORA("dial command failed, dial string was: %s\n", GSMOPEN_P_LOG, at_command);
 		return -1;
 	}
-	res = gsmopen_serial_write_AT_expect(tech_pvt, "AT^DDSETEX=2", tech_pvt->at_dial_expect);
+	//res = gsmopen_serial_write_AT_expect(tech_pvt, "AT^DDSETEX=2", tech_pvt->at_dial_expect);
 
 	return 0;
 }
@@ -3007,6 +3007,8 @@ int gsmopen_serial_init_audio_port(private_t *tech_pvt, int controldevice_audio_
 
 	if (tech_pvt->serialPort_serial_audio->Open(devname, 115200, "8N1", ctb::SerialPort::NoFlowControl) >= 0) {
 		DEBUGA_GSMOPEN("port %s, SUCCESS open\n", GSMOPEN_P_LOG, tech_pvt->controldevice_audio_name);
+		tech_pvt->serialPort_serial_audio_opened =1;
+		gsmopen_serial_write_AT_expect(tech_pvt, "AT^DDSETEX=2", tech_pvt->at_dial_expect);
 	} else {
 #ifdef WIN32
 		LPVOID msg;
@@ -3054,6 +3056,7 @@ int serial_audio_shutdown(private_t *tech_pvt)
 
 	res = tech_pvt->serialPort_serial_audio->Close();
 	DEBUGA_GSMOPEN("serial_audio_shutdown res=%d (controldev_audio_fd is %d)\n", GSMOPEN_P_LOG, res, tech_pvt->controldev_audio_fd);
+	tech_pvt->serialPort_serial_audio_opened =0;
 
 	return res;
 }
diff --git a/src/mod/endpoints/mod_gsmopen/mod_gsmopen.cpp b/src/mod/endpoints/mod_gsmopen/mod_gsmopen.cpp
index 2b9f8bf350..9e78b8f55b 100644
--- a/src/mod/endpoints/mod_gsmopen/mod_gsmopen.cpp
+++ b/src/mod/endpoints/mod_gsmopen/mod_gsmopen.cpp
@@ -208,6 +208,7 @@ switch_status_t gsmopen_tech_init(private_t *tech_pvt, switch_core_session_t *se
 	dtmf_rx_init(&tech_pvt->dtmf_state, NULL, NULL);
 	dtmf_rx_parms(&tech_pvt->dtmf_state, 0, 10, 10, -99);
 
+/*
 	if (tech_pvt->no_sound == 0) {
 		if (serial_audio_init(tech_pvt)) {
 			ERRORA("serial_audio_init failed\n", GSMOPEN_P_LOG);
@@ -215,6 +216,7 @@ switch_status_t gsmopen_tech_init(private_t *tech_pvt, switch_core_session_t *se
 
 		}
 	}
+*/
 
 	if (switch_core_timer_init(&tech_pvt->timer_read, "soft", 20, tech_pvt->read_codec.implementation->samples_per_packet, gsmopen_module_pool) !=
 		SWITCH_STATUS_SUCCESS) {
@@ -805,6 +807,9 @@ static switch_status_t channel_write_frame(switch_core_session_t *session, switc
 
 	gsmopen_sound_boost(frame->data, frame->samples, tech_pvt->playback_boost);
 	if (!tech_pvt->no_sound) {
+		if (!tech_pvt->serialPort_serial_audio_opened) {
+			serial_audio_init(tech_pvt);
+		}
 		sent = tech_pvt->serialPort_serial_audio->Write((char *) frame->data, (int) (frame->datalen));
 
 		if (sent && sent != frame->datalen && sent != -1) {